CN117450628B - Defrosting control method and device for unit, unit and storage medium - Google Patents

Defrosting control method and device for unit, unit and storage medium Download PDF

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Publication number
CN117450628B
CN117450628B CN202311804605.1A CN202311804605A CN117450628B CN 117450628 B CN117450628 B CN 117450628B CN 202311804605 A CN202311804605 A CN 202311804605A CN 117450628 B CN117450628 B CN 117450628B
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unit
current
temperature
compressor
moisture content
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CN117450628A (en
Inventor
曾佳榆
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/42—Defrosting; Preventing freezing of outdoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/20—Humidity
    • F24F2110/22—Humidity of the outside air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Thermal Sciences (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention belongs to a heat pump unit, and discloses a defrosting control method and device of the unit, the unit and a storage medium, wherein the method comprises the following steps: under the condition that a starting-up instruction of the unit is received, controlling the unit to start up and run under the condition that the current water inlet temperature of the unit is in a set water inlet temperature range; under the condition that the unit operates, under the condition that the current outer pipe temperature of the unit is less than or equal to 0 ℃, the unit is controlled to enter and exit a preset defrosting mode by combining the current outdoor environment dry bulb temperature of the unit, the current outdoor environment wet bulb temperature of the unit, the current air suction temperature of the compressor, the current air suction superheat degree of the compressor, the current frequency of the compressor, the current opening degree of the electronic expansion valve and the current outer pipe temperature of the unit, so that defrosting control of the unit is realized. According to the scheme, the frosting state of the unit is estimated more accurately by combining the absolute moisture content of the outdoor air and the air suction temperature of the compressor, the intelligent frosting of the unit is controlled, and the comprehensive energy efficiency of the unit is improved.

Description

Defrosting control method and device for unit, unit and storage medium
Technical Field
The invention belongs to the technical field of heat pump units, and particularly relates to a defrosting control method, a defrosting control device, a defrosting control unit and a storage medium of a unit, in particular to an intelligent defrosting control method, an intelligent defrosting control device, a defrosting control unit and a storage medium under heating conditions of a household water machine or an air source heat pump and other units.
Background
The outdoor heat exchanger of the indoor water machine or the air source heat pump adopts a fin heat exchanger, and the frosting of the fins is caused by the fact that the wet air meets the fins below zero and the temperature of the fins is lower than the dew point temperature of the cold air, so that water vapor in the wet air can be subjected to heat release condensation, and condensed water generated at the fins is cooled to form frost. The outdoor heat exchanger of the household water machine or the air source heat pump and other units is easy to frost in the heating operation process, periodic defrosting operation is needed, and the heating mode is frequently switched into the defrosting mode, so that the periodic defrosting operation can cause the cold and hot offset of the household water machine or the air source heat pump and other units, and the comprehensive energy efficiency of the household water machine or the air source heat pump and other units is reduced.
The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art.
Disclosure of Invention
The invention aims to provide a defrosting control method, a device, a unit and a storage medium of a unit, which are used for solving the problems that the outdoor heat exchanger is easy to frost and needs to perform periodic defrosting operation in the process of heating operation of the unit such as a household water machine or an air source heat pump, so that the cold and heat of the unit such as the household water machine or the air source heat pump are counteracted, the comprehensive energy efficiency of the unit such as the household water machine or the air source heat pump is reduced, and the effects that the frosting state of the unit is estimated more accurately by combining the absolute moisture content of outdoor air and the air suction temperature of a compressor, the intelligent defrosting of the unit is controlled, and the comprehensive energy efficiency of the unit is improved are achieved.
The invention provides a defrosting control method of a unit, which comprises an outdoor unit and an indoor unit, wherein the indoor unit is provided with a defrosting control unit; the outdoor unit includes: a compressor, an outdoor heat exchanger, and an electronic expansion valve; the indoor unit includes: an indoor heat exchanger; the indoor heat exchanger is provided with a water side heat exchange pipeline and a refrigerant side heat exchange pipeline; an exhaust port of the compressor returns to an air suction port of the compressor after passing through the refrigerant side heat exchange pipelines of the outdoor heat exchanger, the electronic expansion valve and the indoor heat exchanger; the defrosting control method of the unit comprises the following steps: under the condition that a starting-up instruction of the unit is received, acquiring the temperature of a pipeline where a water inlet of a water side heat exchange pipeline of the indoor heat exchanger is positioned, and recording the temperature as the current water inlet temperature of the unit; controlling the machine set to start and run under the condition that the current water inlet temperature of the machine set is in the set water inlet temperature range; under the condition that the unit operates, acquiring the fin temperature of the outdoor heat exchanger, and recording the fin temperature as the current outer tube temperature of the unit; acquiring the temperature of a pipeline where an air suction port of the compressor is positioned, and recording the temperature as the current air suction temperature of the compressor; acquiring the dry bulb temperature and the wet bulb temperature of the outdoor heat exchanger, and recording the dry bulb temperature and the wet bulb temperature as the current outdoor environment dry bulb temperature and the current outdoor environment wet bulb temperature of the unit; acquiring the current suction superheat degree of the compressor; acquiring the current frequency of the compressor; acquiring the current opening of the electronic expansion valve; and under the condition that the current outer pipe temperature of the unit is less than or equal to 0 ℃, controlling the unit to enter and exit a preset defrosting mode by combining the current outdoor environment dry bulb temperature of the unit, the current outdoor environment wet bulb temperature of the unit, the current air suction temperature of the compressor, the current air suction superheat degree of the compressor, the current frequency of the compressor, the current opening of the electronic expansion valve and the current outer pipe temperature of the unit so as to realize defrosting control of the unit.
In some embodiments, in combination with a current outdoor ambient dry bulb temperature of the unit, a current outdoor ambient wet bulb temperature of the unit, a current suction temperature of the compressor, a current suction superheat of the compressor, a current frequency of the compressor, a current opening of the electronic expansion valve, and a current outer tube temperature of the unit, the unit is controlled to enter and exit a preset defrosting mode to realize defrosting control of the unit, including: determining the absolute moisture content of the current outdoor air of the unit according to the current outdoor environment dry bulb temperature of the unit and the current outdoor environment wet bulb temperature of the unit; according to the interval where the absolute moisture content of the current outdoor air of the unit is in the set moisture content range, combining the current outdoor environment dry bulb temperature of the unit, the current outdoor environment wet bulb temperature of the unit, the current air suction temperature of the compressor, the current air suction superheat degree of the compressor, the current frequency of the compressor and the current opening of the electronic expansion valve, and controlling the unit to enter a preset defrosting mode; and after the unit enters a preset defrosting mode, controlling the unit to exit the preset defrosting mode according to the current outer tube temperature of the unit so as to realize defrosting control of the unit.
In some embodiments, wherein setting the moisture content range comprises: an outdoor air moisture content range divided by the first set moisture content and the second set moisture content; the section of the unit, in which the absolute moisture content of the current outdoor air is smaller than or equal to the first set moisture content, is a first humidity section, the section of the unit, in which the absolute moisture content of the current outdoor air is larger than the first set moisture content and smaller than or equal to the second set moisture content, is a second humidity section, and the section of the unit, in which the absolute moisture content of the current outdoor air is larger than the second set moisture content, is a third humidity section; according to the interval where the absolute moisture content of the current outdoor air of the unit is in the set moisture content range, in combination with the current outdoor environment dry bulb temperature of the unit, the current outdoor environment wet bulb temperature of the unit, the current air suction temperature of the compressor, the current air suction superheat degree of the compressor, the current frequency of the compressor and the current opening of the electronic expansion valve, controlling the unit to enter a preset defrosting mode, wherein the method comprises the following steps: determining a section where the absolute moisture content of the current outdoor air of the unit is in a set moisture content range; if the interval where the absolute moisture content of the current outdoor air of the unit is in the set moisture content range is determined to be a first humidity interval, controlling the unit to enter a preset defrosting mode according to the current air suction temperature of the compressor and the current outdoor environment dry bulb temperature of the unit; if the section where the absolute moisture content of the current outdoor air of the unit is in the set moisture content range is determined to be a second humidity section, controlling the unit to enter a preset defrosting mode according to the current air suction superheat degree of the compressor, the current opening degree of the electronic expansion valve, the current air suction temperature of the compressor and the current outdoor environment dry bulb temperature of the unit; if the section where the absolute moisture content of the current outdoor air of the unit is in the set moisture content range is determined to be a third moisture section, controlling the unit to enter a preset defrosting mode according to the current frequency of the compressor, the current suction superheat degree of the compressor, the current opening degree of the electronic expansion valve, the current suction temperature of the compressor and the current outdoor environment dry bulb temperature of the unit.
In some embodiments, controlling the unit to enter a preset defrosting mode according to the current suction temperature of the compressor and the current outdoor environment dry bulb temperature of the unit comprises: determining a difference value between the current outdoor environment dry bulb temperature of the unit and a first set temperature, and recording the difference value as a first temperature threshold; determining whether a current suction temperature of the compressor is less than or equal to a first temperature threshold; if the current air suction temperature of the compressor is less than or equal to a first temperature threshold value, controlling the unit to enter a preset defrosting mode; if the current suction temperature of the compressor is determined to be greater than the first temperature threshold, returning to re-determine whether the current suction temperature of the compressor is less than or equal to the first temperature threshold.
In some embodiments, controlling the unit to enter a preset defrosting mode according to the current suction superheat degree of the compressor, the current opening degree of the electronic expansion valve, the current suction temperature of the compressor and the current outdoor environment dry bulb temperature of the unit comprises: determining whether the current suction superheat degree of the compressor is greater than or equal to the difference value between the set suction superheat degree and the set value; if the current air suction superheat degree of the compressor is determined to be greater than or equal to the difference value between the set air suction superheat degree and the set value, controlling the current opening degree of the electronic expansion valve to be increased by the set opening degree to obtain a new current opening degree of the electronic expansion valve, and returning to determine whether the current air suction superheat degree of the compressor is greater than or equal to the difference value between the set air suction superheat degree and the set value; if the current suction superheat degree of the compressor is smaller than the difference value between the set suction superheat degree and the set value, determining the difference value between the current outdoor environment dry bulb temperature of the unit and the second set temperature, and recording the difference value as a second temperature threshold; and determining whether a current suction temperature of the compressor is less than or equal to a second temperature threshold; wherein the second set temperature is less than the first set temperature; if the current air suction temperature of the compressor is less than or equal to a second temperature threshold value, controlling the unit to enter a preset defrosting mode; if the current suction temperature of the compressor is determined to be greater than the second temperature threshold, returning to re-determine whether the current suction temperature of the compressor is less than or equal to the second temperature threshold.
In some embodiments, controlling the unit to enter a preset defrosting mode according to a current frequency of the compressor, a current suction superheat of the compressor, a current opening of the electronic expansion valve, a current suction temperature of the compressor, and a current outdoor environment dry bulb temperature of the unit, including: determining whether a current frequency of the compressor is greater than or equal to a set maximum frequency; if the current frequency of the compressor is determined to be greater than or equal to the set maximum frequency, reducing the current frequency of the compressor to the set maximum frequency to obtain a new current frequency of the compressor, and then determining whether the current suction superheat degree of the compressor is greater than or equal to the difference value between the set suction superheat degree and the set value; if the current frequency of the compressor is determined to be smaller than the set maximum frequency, determining whether the current suction superheat degree of the compressor is larger than or equal to the difference value between the set suction superheat degree and the set value; if the current air suction superheat degree of the compressor is determined to be greater than or equal to the difference value between the set air suction superheat degree and the set value, controlling the current opening degree of the electronic expansion valve to be increased by the set opening degree to obtain a new current opening degree of the electronic expansion valve, and returning to determine whether the current air suction superheat degree of the compressor is greater than or equal to the difference value between the set air suction superheat degree and the set value; if the current suction superheat degree of the compressor is smaller than the difference value between the set suction superheat degree and the set value, determining the difference value between the current outdoor environment dry bulb temperature of the unit and the third set temperature, and recording the difference value as a third temperature threshold; and determining whether a current suction temperature of the compressor is less than or equal to a third temperature threshold; wherein the third set temperature is less than the second set temperature; if the current air suction temperature of the compressor is less than or equal to a third temperature threshold value, controlling the unit to enter a preset defrosting mode; if the current suction temperature of the compressor is determined to be greater than the third temperature threshold, returning to re-determine whether the current suction temperature of the compressor is less than or equal to the third temperature threshold.
In some embodiments, after the unit enters a preset defrosting mode, according to the current outer tube temperature of the unit, the unit is controlled to exit the preset defrosting mode so as to realize defrosting control of the unit, including: after the unit enters a preset defrosting mode, determining whether the current outer tube temperature of the unit is greater than or equal to a fourth set temperature; wherein the fourth set temperature is greater than 0; if the current outer tube temperature of the unit is determined to be greater than or equal to the fourth set temperature, controlling the unit to exit from a preset defrosting mode so as to realize defrosting control of the unit; and if the current outer tube temperature of the unit is determined to be smaller than the fourth set temperature, returning to determine whether the current outer tube temperature of the unit is greater than or equal to the fourth set temperature again.
In accordance with the present invention, there is provided a defrosting control device for a unit having an outdoor unit and an indoor unit; the outdoor unit includes: a compressor, an outdoor heat exchanger, and an electronic expansion valve; the indoor unit includes: an indoor heat exchanger; the indoor heat exchanger is provided with a water side heat exchange pipeline and a refrigerant side heat exchange pipeline; an exhaust port of the compressor returns to an air suction port of the compressor after passing through the refrigerant side heat exchange pipelines of the outdoor heat exchanger, the electronic expansion valve and the indoor heat exchanger; defrosting control device of unit includes: the acquisition unit is configured to acquire the temperature of a pipeline where a water inlet of the water side heat exchange pipeline of the indoor heat exchanger is positioned under the condition that a starting-up instruction of the unit is received, and the temperature is recorded as the current water inlet temperature of the unit; the control unit is configured to control the unit to start and run under the condition that the current water inlet temperature of the unit is within a set water inlet temperature range; the acquisition unit is further configured to acquire the fin temperature of the outdoor heat exchanger under the condition that the unit is operated, and record the fin temperature as the current outer tube temperature of the unit; acquiring the temperature of a pipeline where an air suction port of the compressor is positioned, and recording the temperature as the current air suction temperature of the compressor; acquiring the dry bulb temperature and the wet bulb temperature of the outdoor heat exchanger, and recording the dry bulb temperature and the wet bulb temperature as the current outdoor environment dry bulb temperature and the current outdoor environment wet bulb temperature of the unit; acquiring the current suction superheat degree of the compressor; acquiring the current frequency of the compressor; acquiring the current opening of the electronic expansion valve; the control unit is further configured to control the unit to enter and exit a preset defrosting mode under the condition that the current outer tube temperature of the unit is less than or equal to 0 ℃, in combination with the current outdoor environment dry bulb temperature of the unit, the current outdoor environment wet bulb temperature of the unit, the current air suction temperature of the compressor, the current air suction superheat degree of the compressor, the current frequency of the compressor, the current opening of the electronic expansion valve and the current outer tube temperature of the unit, so as to realize defrosting control of the unit.
In some embodiments, the control unit controls the unit to enter and exit a preset defrosting mode in combination with a current outdoor environment dry bulb temperature of the unit, a current outdoor environment wet bulb temperature of the unit, a current suction temperature of the compressor, a current suction superheat degree of the compressor, a current frequency of the compressor, a current opening degree of the electronic expansion valve, and a current outer tube temperature of the unit, so as to realize defrosting control of the unit, and the control unit comprises: determining the absolute moisture content of the current outdoor air of the unit according to the current outdoor environment dry bulb temperature of the unit and the current outdoor environment wet bulb temperature of the unit; according to the interval where the absolute moisture content of the current outdoor air of the unit is in the set moisture content range, combining the current outdoor environment dry bulb temperature of the unit, the current outdoor environment wet bulb temperature of the unit, the current air suction temperature of the compressor, the current air suction superheat degree of the compressor, the current frequency of the compressor and the current opening of the electronic expansion valve, and controlling the unit to enter a preset defrosting mode; and after the unit enters a preset defrosting mode, controlling the unit to exit the preset defrosting mode according to the current outer tube temperature of the unit so as to realize defrosting control of the unit.
In some embodiments, wherein setting the moisture content range comprises: an outdoor air moisture content range divided by the first set moisture content and the second set moisture content; the section of the unit, in which the absolute moisture content of the current outdoor air is smaller than or equal to the first set moisture content, is a first humidity section, the section of the unit, in which the absolute moisture content of the current outdoor air is larger than the first set moisture content and smaller than or equal to the second set moisture content, is a second humidity section, and the section of the unit, in which the absolute moisture content of the current outdoor air is larger than the second set moisture content, is a third humidity section; the control unit controls the unit to enter a preset defrosting mode according to a section where the absolute moisture content of the current outdoor air of the unit is in a set moisture content range, in combination with the current outdoor environment dry bulb temperature of the unit, the current outdoor environment wet bulb temperature of the unit, the current air suction temperature of the compressor, the current air suction superheat degree of the compressor, the current frequency of the compressor and the current opening of the electronic expansion valve, and comprises the following steps: determining a section where the absolute moisture content of the current outdoor air of the unit is in a set moisture content range; if the interval where the absolute moisture content of the current outdoor air of the unit is in the set moisture content range is determined to be a first humidity interval, controlling the unit to enter a preset defrosting mode according to the current air suction temperature of the compressor and the current outdoor environment dry bulb temperature of the unit; if the section where the absolute moisture content of the current outdoor air of the unit is in the set moisture content range is determined to be a second humidity section, controlling the unit to enter a preset defrosting mode according to the current air suction superheat degree of the compressor, the current opening degree of the electronic expansion valve, the current air suction temperature of the compressor and the current outdoor environment dry bulb temperature of the unit; if the section where the absolute moisture content of the current outdoor air of the unit is in the set moisture content range is determined to be a third moisture section, controlling the unit to enter a preset defrosting mode according to the current frequency of the compressor, the current suction superheat degree of the compressor, the current opening degree of the electronic expansion valve, the current suction temperature of the compressor and the current outdoor environment dry bulb temperature of the unit.
In some embodiments, the control unit controls the unit to enter a preset defrosting mode according to a current suction temperature of the compressor and a current outdoor environment dry bulb temperature of the unit, including: determining a difference value between the current outdoor environment dry bulb temperature of the unit and a first set temperature, and recording the difference value as a first temperature threshold; determining whether a current suction temperature of the compressor is less than or equal to a first temperature threshold; if the current air suction temperature of the compressor is less than or equal to a first temperature threshold value, controlling the unit to enter a preset defrosting mode; if the current suction temperature of the compressor is determined to be greater than the first temperature threshold, returning to re-determine whether the current suction temperature of the compressor is less than or equal to the first temperature threshold.
In some embodiments, the control unit controls the unit to enter a preset defrosting mode according to a current suction superheat degree of the compressor, a current opening degree of the electronic expansion valve, a current suction temperature of the compressor, and a current outdoor environment dry bulb temperature of the unit, including: determining whether the current suction superheat degree of the compressor is greater than or equal to the difference value between the set suction superheat degree and the set value; if the current air suction superheat degree of the compressor is determined to be greater than or equal to the difference value between the set air suction superheat degree and the set value, controlling the current opening degree of the electronic expansion valve to be increased by the set opening degree to obtain a new current opening degree of the electronic expansion valve, and returning to determine whether the current air suction superheat degree of the compressor is greater than or equal to the difference value between the set air suction superheat degree and the set value; if the current suction superheat degree of the compressor is smaller than the difference value between the set suction superheat degree and the set value, determining the difference value between the current outdoor environment dry bulb temperature of the unit and the second set temperature, and recording the difference value as a second temperature threshold; and determining whether a current suction temperature of the compressor is less than or equal to a second temperature threshold; wherein the second set temperature is less than the first set temperature; if the current air suction temperature of the compressor is less than or equal to a second temperature threshold value, controlling the unit to enter a preset defrosting mode; if the current suction temperature of the compressor is determined to be greater than the second temperature threshold, returning to re-determine whether the current suction temperature of the compressor is less than or equal to the second temperature threshold.
In some embodiments, the control unit controls the unit to enter a preset defrosting mode according to a current frequency of the compressor, a current suction superheat degree of the compressor, a current opening degree of the electronic expansion valve, a current suction temperature of the compressor, and a current outdoor environment dry bulb temperature of the unit, and the control unit includes: determining whether a current frequency of the compressor is greater than or equal to a set maximum frequency; if the current frequency of the compressor is determined to be greater than or equal to the set maximum frequency, reducing the current frequency of the compressor to the set maximum frequency to obtain a new current frequency of the compressor, and then determining whether the current suction superheat degree of the compressor is greater than or equal to the difference value between the set suction superheat degree and the set value; if the current frequency of the compressor is determined to be smaller than the set maximum frequency, determining whether the current suction superheat degree of the compressor is larger than or equal to the difference value between the set suction superheat degree and the set value; if the current air suction superheat degree of the compressor is determined to be greater than or equal to the difference value between the set air suction superheat degree and the set value, controlling the current opening degree of the electronic expansion valve to be increased by the set opening degree to obtain a new current opening degree of the electronic expansion valve, and returning to determine whether the current air suction superheat degree of the compressor is greater than or equal to the difference value between the set air suction superheat degree and the set value; if the current suction superheat degree of the compressor is smaller than the difference value between the set suction superheat degree and the set value, determining the difference value between the current outdoor environment dry bulb temperature of the unit and the third set temperature, and recording the difference value as a third temperature threshold; and determining whether a current suction temperature of the compressor is less than or equal to a third temperature threshold; wherein the third set temperature is less than the second set temperature; if the current air suction temperature of the compressor is less than or equal to a third temperature threshold value, controlling the unit to enter a preset defrosting mode; if the current suction temperature of the compressor is determined to be greater than the third temperature threshold, returning to re-determine whether the current suction temperature of the compressor is less than or equal to the third temperature threshold.
In some embodiments, the control unit, after the unit enters a preset defrosting mode, controls the unit to exit the preset defrosting mode according to the current external pipe temperature of the unit, so as to realize defrosting control of the unit, and includes: after the unit enters a preset defrosting mode, determining whether the current outer tube temperature of the unit is greater than or equal to a fourth set temperature; wherein the fourth set temperature is greater than 0; if the current outer tube temperature of the unit is determined to be greater than or equal to the fourth set temperature, controlling the unit to exit from a preset defrosting mode so as to realize defrosting control of the unit; and if the current outer tube temperature of the unit is determined to be smaller than the fourth set temperature, returning to determine whether the current outer tube temperature of the unit is greater than or equal to the fourth set temperature again.
In accordance with another aspect of the present invention, there is provided an assembly comprising: the defrosting control device of the unit.
In accordance with the foregoing method, a further aspect of the present invention provides a storage medium, where the storage medium includes a stored program, where the program, when executed, controls a device in which the storage medium is located to execute the method for controlling defrosting of a unit as described above.
Therefore, according to the scheme, after the water inlet temperature of the unit such as the household water machine or the air source heat pump meets the starting condition of the unit, the unit is controlled to start and operate; under the condition that the temperature of the fins of the outdoor heat exchanger is less than or equal to 0, determining the absolute moisture content of outdoor air according to the dry bulb temperature and the wet bulb temperature at the outdoor heat exchanger, and determining the time of entering a defrosting mode and exiting the defrosting mode of the unit in a grading manner according to the section where the absolute moisture content of the outdoor air is in the set moisture content range and by combining the corresponding parameters in the air suction temperature of the compressor, the temperature of the fins of the outdoor heat exchanger, the air suction superheat degree of the compressor and the frequency of the compressor, so that different defrosting judging conditions and anti-frosting measures are adopted in different unit states, and accurate defrosting is realized; therefore, the frosting state of the unit is estimated more accurately by combining the absolute moisture content of the outdoor air and the air suction temperature of the compressor, the intelligent frosting of the unit is controlled, and the comprehensive energy efficiency of the unit is improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a flow chart of an embodiment of a method for controlling defrosting of a unit according to the present invention;
FIG. 2 is a flow chart of an embodiment of controlling the unit to enter and exit a preset defrosting mode in the method of the present invention;
FIG. 3 is a flow chart of an embodiment of controlling the unit to enter a preset defrosting mode in the method of the present invention;
FIG. 4 is a flow chart of an embodiment of controlling the unit to enter a preset defrosting mode in a first humidity range in the method of the present invention;
FIG. 5 is a flow chart of an embodiment of controlling the unit to enter a preset defrosting mode in a second humidity range in the method of the present invention;
FIG. 6 is a flow chart illustrating an embodiment of controlling the unit to enter a preset defrosting mode in a third humidity range in the method of the present invention;
FIG. 7 is a flow chart of an embodiment of controlling the unit to exit a preset defrosting mode in the method of the present invention;
FIG. 8 is a schematic structural view of an embodiment of a defrosting control device of the unit of the present invention;
FIG. 9 is a schematic diagram of an embodiment of a household water turbine;
Fig. 10 is a control flow diagram of an embodiment of an intelligent defrosting control method under heating conditions of a household water machine or an air source heat pump and other units.
In the embodiment of the present invention, reference numerals are as follows, in combination with the accompanying drawings:
1-a water outlet temperature sensing bulb; 2-a gas-liquid separator; 3-an indoor heat exchanger; 4-a water pump; 5-an outdoor heat exchanger; 6-a reservoir; 7-a compressor; 8-an electronic expansion valve; 9-fin bulb; 10-a four-way valve; 11-a water inlet temperature sensing bulb; 12-a controller; 13, a temperature controller; 14-communication lines; 15-a low pressure sensor; 16-dry-wet ball pressure sensor; 202-an acquisition unit; 204-control unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In consideration of the fact that the outdoor heat exchanger is easy to frost in the heating operation process of the household water machine or the air source heat pump and the like, periodic defrosting operation is needed, so that cold and heat of the household water machine or the air source heat pump and the like are counteracted, and comprehensive energy efficiency of the household water machine or the air source heat pump and the like is reduced. In order to reduce the phenomenon of false defrosting such as early defrosting or delayed defrosting of an outdoor heat exchanger, relative humidity is adopted as a judging condition for starting defrosting in a related scheme, however, in a cold and dry area, when the air temperature is low and the relative humidity reaches 100%, the absolute moisture content of outdoor air is still low, only a thin layer of frost is arranged on the surface of an outdoor unit, the frosting speed is slow, and the phenomenon of 'early defrosting' still occurs; in areas with a moist and mild climate, when the air temperature is not very low but the relative humidity reaches 100%, the absolute moisture content of the outdoor air is very high, so that the frosting rate is high, and the phenomenon of 'frosting delay' still occurs.
In addition, it is considered that after the outdoor heat exchanger of the unit such as the household water machine or the air source heat pump frosts, the low-pressure side pressure of the compressor 7 is in a lower state, and the suction temperature of the compressor 7 corresponding to the low-pressure of the compressor 7 is also lower, which results in an increase of the compressor operation pressure ratio and reduces the performance of the unit operation.
Therefore, the scheme of the invention provides a defrosting control method of a unit, in particular to an intelligent defrosting control method under the heating working conditions of a household water machine or an air source heat pump and the like, the frosting state of the unit can be estimated by carrying out hierarchical adjustment on the difference between the outdoor dry bulb temperature and the suction temperature of the compressor 7 according to the absolute moisture content of outdoor air, and whether the unit enters a defrosting mode is determined, so that the frosting state of the unit can be accurately identified, the situation that the unit is cooled and heated due to the fact that the frosting at a fin is very small and the unit enters the defrosting mode is prevented, and the comprehensive energy efficiency of the unit is reduced is facilitated, and the comprehensive energy efficiency of the unit is improved.
According to an embodiment of the present invention, there is provided a defrosting control method for a unit, as shown in fig. 1, which is a schematic flow chart of an embodiment of the method of the present invention. The unit is provided with an outdoor unit and an indoor unit; the outdoor unit includes: a compressor 7, an outdoor heat exchanger 5, and an electronic expansion valve 8; the indoor unit includes: an indoor heat exchanger 3; the indoor heat exchanger 3 is provided with a water side heat exchange pipeline and a refrigerant side heat exchange pipeline; the exhaust port of the compressor 7 returns to the air inlet of the compressor 7 after passing through the refrigerant side heat exchange line of the indoor heat exchanger 3, the outdoor heat exchanger 5, the electronic expansion valve 8, and the outdoor heat exchanger 5.
Specifically, fig. 9 is a schematic structural diagram of an embodiment of a household water machine. The household water machine as shown in fig. 9 comprises: the device comprises a water outlet temperature sensing bulb 1, a gas-liquid separator 2, an indoor heat exchanger 3, a water pump 4, an outdoor heat exchanger 5, a liquid reservoir 6, a compressor 7, an electronic expansion valve 8, a fin temperature sensing bulb 9, a four-way valve 10, a water inlet temperature sensing bulb 11, a controller 12, a temperature controller 13, a communication line 14, a low pressure sensor 15 and a dry-wet ball pressure sensor 16. The indoor heat exchanger 3 has a water-side heat exchange line and a refrigerant-side heat exchange line. The discharge port of the compressor 7 is connected to the fourth port of the four-way valve 10. The first port of the four-way valve 10 is communicated with the third port of the four-way valve 10 after passing through the refrigerant side heat exchange pipeline of the indoor heat exchanger 3, the electronic expansion valve 8, the liquid storage 6 and the outdoor heat exchanger 5. The second port of the four-way valve 10 passes through the gas-liquid separator 2 and returns to the intake port of the compressor 7. The outdoor heat exchanger 5 is provided with a wet and dry ball pressure sensor 16. A water pump 4 and a water inlet temperature sensing bulb 11 are arranged on a water inlet pipeline of a water side heat exchange pipeline of the indoor heat exchanger 3. A water outlet temperature sensing bulb 1 is arranged on a water outlet pipeline of the water side heat exchange pipeline of the indoor heat exchanger 3. A low pressure sensor 15 is provided in the intake port of the compressor 7. The outdoor heat exchanger 5 is provided with a fin bulb 9. The fin temperature sensing bulb 9 is connected with the controller 12. The controller 12 is connected with the temperature controller 13 through a communication line 14.
In the scheme of the invention, as shown in fig. 1, the defrosting control method of the unit comprises the following steps: step S110 to step S140.
At step S110, under the condition that a start-up instruction of the unit is received, a temperature of a pipeline where a water inlet of the water side heat exchange pipeline of the indoor heat exchanger 3 is located is obtained and is recorded as a current water inlet temperature of the unit, such as a water inlet temperature T of the unit Water and its preparation method 。
Specifically, fig. 10 is a schematic control flow diagram of an embodiment of an intelligent frost control method under a heating condition of a household water machine or an air source heat pump. As shown in fig. 10, the intelligent defrosting control method under the heating condition of the household water machine or the air source heat pump and other units comprises the following steps: step 1, when a unit is started, a heating mode is set, and a user sets a target water outlet temperature T Effluent water Step 2 is then performed. Step 2, reading the water inlet temperature T of the unit Water and its preparation method For example, the temperature T of the water inlet of the water side heat exchange pipeline of the indoor heat exchanger 3 detected by the water inlet temperature sensing bulb 11 is read Water and its preparation method Then, step 3 is executed to adjust the water inlet temperature T of the unit Water and its preparation method And controlling the starting up of the unit.
At step S120, in the case that the current water inlet temperature of the unit is within the set water inlet temperature range, the unit is controlled to start and operate.
Specifically, as shown in fig. 10, the household water machine or the airThe intelligent defrosting control method under the heating working conditions of the air source heat pump and other units further comprises the following steps: step 3, the temperature controller 13 is used for controlling the water inlet temperature T of the unit Water and its preparation method Judging whether the starting conditions of the unit are met: if the water inlet temperature T of the unit Water and its preparation method If the starting condition of the unit is not met, returning to the step 2 to read the water inlet temperature T of the water tank again Water and its preparation method Until the starting condition of the unit is met; if the water inlet temperature T of the unit Water and its preparation method And (4) if the starting condition of the unit is met, executing the step (4). Wherein, if the water inlet temperature T of the unit Water and its preparation method In the case of setting the water inlet temperature range, then the water inlet temperature T of the unit is determined Water and its preparation method Meets the starting conditions of the machine set. Step 4, the temperature controller 13 controls the machine set to start up, and then step 5 is executed to read the fin temperature T of the outdoor heat exchanger 5 c 。
At step S130, in the case of operation of the unit, the fin temperature of the outdoor heat exchanger 5 is obtained and recorded as the current outer tube temperature of the unit, such as the fin taking temperature T of the outdoor heat exchanger 5 c The method comprises the steps of carrying out a first treatment on the surface of the Acquiring the temperature of the pipeline of the air suction port of the compressor 7 and recording the temperature as the current air suction temperature of the compressor 7, such as reading the air suction temperature T of the compressor 7 corresponding to the low pressure sensor 15 l The method comprises the steps of carrying out a first treatment on the surface of the Acquiring the dry bulb temperature and the wet bulb temperature of the outdoor heat exchanger 5, and recording the dry bulb temperature and the wet bulb temperature as the current outdoor environment dry bulb temperature of the unit and the current outdoor environment wet bulb temperature of the unit, for example, reading the dry bulb temperature T of the outdoor heat exchanger 5 corresponding to the dry bulb pressure sensor 16 d And wet bulb temperature T w The method comprises the steps of carrying out a first treatment on the surface of the Acquiring the current suction superheat degree of the compressor 7, for example, reading the suction superheat degree a of the compressor 7 after the unit is stable; acquiring the current frequency of the compressor 7, such as the frequency F of the compressor 7; and acquires the current opening degree of the electronic expansion valve 8, such as the opening degree K of the electronic expansion valve 8.
Specifically, as shown in fig. 10, the intelligent defrosting control method under the heating working condition of the household water machine or the air source heat pump and other units further comprises the following steps: step 5, reading the fin temperature T of the outdoor heat exchanger 5 c For example, the fin temperature T of the outdoor heat exchanger 5 detected by the fin bulb 9 is read c Step 6 is then performed. Step (a)6. Judging the fin temperature T of the outdoor heat exchanger 5 c Whether the relation of less than or equal to 0 is established: if the fin temperature T of the outdoor heat exchanger 5 c If the relation less than or equal to 0 is not established, the condition that the fins of the outdoor heat exchanger 5 of the unit are free from frosting risks is indicated, the unit returns to the circulation of normal operation of the unit, and the step 5 is returned to continue reading the fin taking temperature T of the outdoor heat exchanger 5 c The method comprises the steps of carrying out a first treatment on the surface of the If the fin temperature T of the outdoor heat exchanger 5 c If the relation of less than or equal to 0 is established, the dry ball temperature T at the outdoor heat exchanger 5 corresponding to the dry ball pressure sensor 16 is read d And wet bulb temperature T w Step 7 is then performed to determine the dry bulb temperature T d And wet bulb temperature T w The corresponding absolute moisture content d of the outdoor air is calculated. Wherein the dry-wet ball pressure sensor 16 can detect the dry-ball pressure and the wet-ball pressure, and can determine the dry-ball temperature T according to the corresponding relation between the set dry-ball pressure and the set dry-ball temperature d The wet bulb temperature T can be determined according to the corresponding relation between the set wet bulb pressure and the set wet bulb temperature w 。
At step S140, when the current outer tube temperature of the unit is less than or equal to 0 ℃, the unit is controlled to enter and exit a preset defrosting mode in combination with the current outdoor environment dry bulb temperature of the unit, the current outdoor environment wet bulb temperature of the unit, the current suction temperature of the compressor 7, the current suction superheat degree of the compressor 7, the current frequency of the compressor 7, the current opening degree of the electronic expansion valve 8, and the current outer tube temperature of the unit, so as to realize defrosting control of the unit.
The scheme of the invention provides an intelligent defrosting control scheme under the heating working conditions of a household water machine or an air source heat pump and other units, and as the outdoor heat exchanger 5 of the unit blocks a fin channel after frosting, the heat resistance of the outdoor heat exchanger 5 is increased, so that the evaporation side pressure (namely the low pressure of the compressor 7) of the unit is reduced, the saturation temperature corresponding to the low pressure of the compressor 7 is also reduced, and therefore, the scheme of the invention identifies whether the unit enters a defrosting mode according to the difference between the dry bulb temperature of the outdoor environment and the air suction temperature of the compressor 7. However, experiments find that the dry bulb temperature and the dry bulb temperature in the outdoor environment When the difference between the intake temperatures of the compressors 7 is the same, the frosting state of the fins of the outdoor heat exchanger 5 varies with different absolute moisture contents of the outdoor air, specifically, the frosting is thicker when the absolute moisture content of the outdoor air is higher and the frosting is smaller when the absolute moisture content of the outdoor air is lower. Therefore, the scheme of the invention uses the dry bulb temperature T of the outdoor environment according to the absolute moisture content d of the outdoor air d And the suction temperature of the compressor 7 l The method can accurately identify the frosting state of the unit by performing hierarchical adjustment, prevent the unit from frequently switching the frosting mode when frosting is less, reduce unnecessary frosting operation and effectively save the energy consumption of the unit. Meanwhile, the scheme of the invention increases the anti-frosting measure at the medium humidity and the high humidity, and comprises the following steps: the opening of the electronic expansion valve 8 is increased, the frequency of the compressor 7 is limited, and the defrosting period is prolonged to the maximum extent by adjusting the unit parameters.
In some embodiments, in step S140, when the current outer tube temperature of the unit is less than or equal to 0 ℃, the unit is controlled to enter and exit a preset defrosting mode in combination with the current outdoor environment dry bulb temperature of the unit, the current outdoor environment wet bulb temperature of the unit, the current suction temperature of the compressor 7, the current suction superheat of the compressor 7, the current frequency of the compressor 7, the current opening of the electronic expansion valve 8, and the current outer tube temperature of the unit, so as to realize a specific process of defrosting control of the unit, see the following exemplary description.
The following is a schematic flow chart of an embodiment of controlling the unit to enter and exit the preset defrosting mode in the method of the present invention in connection with fig. 2, which further describes a specific process of controlling the unit to enter and exit the preset defrosting mode in step S140, including: step S210 to step S230.
Step S210, determining the absolute moisture content of the current outdoor air of the unit according to the current outdoor environment dry bulb temperature of the unit and the current outdoor environment wet bulb temperature of the unit under the condition that the current outer tube temperature of the unit is less than or equal to 0 ℃, for example, reading the dry bulb temperature at the outdoor heat exchanger 5 corresponding to the dry bulb pressure sensor 16T d And wet bulb temperature T w According to the dry bulb temperature T d And wet bulb temperature T w The corresponding absolute moisture content d of the outdoor air is calculated.
Specifically, as shown in fig. 10, the intelligent defrosting control method under the heating working condition of the household water machine or the air source heat pump and other units further comprises the following steps: step 7, according to the dry bulb temperature T d And wet bulb temperature T w Calculating the corresponding absolute moisture content d of the outdoor air, and then executing step 8 to judge that the absolute moisture content d of the outdoor air is less than or equal to the moisture content d min Whether or not the relation of (c) is established. Wherein, based on the dry bulb temperature T d And wet bulb temperature T w The corresponding absolute moisture content d of the outdoor air can be obtained according to the corresponding relation among the set dry bulb temperature, the set wet bulb temperature and the set absolute moisture content of the outdoor air.
Step S220, when the current outer tube temperature of the unit is less than or equal to 0 ℃, according to the interval where the absolute moisture content of the current outdoor air of the unit is in the set moisture content range, controlling the unit to enter a preset defrosting mode by combining the current outdoor environment dry bulb temperature of the unit, the current outdoor environment wet bulb temperature of the unit, the current air suction temperature of the compressor 7, the current air suction superheat degree of the compressor 7, the current frequency of the compressor 7 and the current opening of the electronic expansion valve 8.
In some embodiments, setting the moisture content range includes: an outdoor air moisture content range divided by a first set moisture content, such as moisture content d, and a second set moisture content min A second set moisture content such as moisture content d mid The method comprises the steps of carrying out a first treatment on the surface of the The section of the unit, in which the absolute moisture content of the current outdoor air is smaller than or equal to the first set moisture content, is a first humidity section, the section of the unit, in which the absolute moisture content of the current outdoor air is larger than the first set moisture content and smaller than or equal to the second set moisture content, is a second humidity section, and the section of the unit, in which the absolute moisture content of the current outdoor air is larger than the second set moisture content, is a third humidity section.
In step S220, when the current external pipe temperature of the unit is less than or equal to 0 ℃, according to the interval where the absolute humidity of the current outdoor air of the unit is in the set humidity range, the specific process of entering the preset defrosting mode of the unit is controlled by combining the current outdoor environment dry bulb temperature of the unit, the current outdoor environment wet bulb temperature of the unit, the current air suction temperature of the compressor 7, the current air suction superheat degree of the compressor 7, the current frequency of the compressor 7 and the current opening degree of the electronic expansion valve 8, see the following exemplary description.
The following is a schematic flow chart of an embodiment of the method of the present invention in connection with fig. 3 for controlling the unit to enter the preset defrosting mode, and further describes a specific process for controlling the unit to enter the preset defrosting mode in step S220, which includes: step S310 to step S340.
And step S310, determining a section in which the absolute moisture content of the current outdoor air of the unit is in a set moisture content range under the condition that the current outer pipe temperature of the unit is less than or equal to 0 ℃. Specifically, as shown in fig. 10, the intelligent defrosting control method under the heating working condition of the household water machine or the air source heat pump and other units further comprises the following steps: step 8, judging that the absolute moisture content d of the outdoor air is less than or equal to the moisture content d min Whether or not the relation of (2) holds: if yes, go to step 81 to read the suction temperature T of the compressor 7 corresponding to the low pressure sensor 15 l Otherwise, go to step 9 to determine the moisture content d min <Absolute moisture content d of outdoor air is less than or equal to moisture content d mid Whether or not the relation of (c) is established. Wherein the moisture content d min The absolute moisture content of outdoor air when the unit is not easy to frost is referred to, and the value of the absolute moisture content is required to be determined according to the experimental data condition of the specific unit.
Step S320, if it is determined that the section where the absolute humidity of the current outdoor air of the unit is within the set humidity range is the first humidity section when the current outer tube temperature of the unit is less than or equal to 0 ℃, controlling the unit to enter the preset defrosting mode according to the current suction temperature of the compressor 7 and the current outdoor environment dry bulb temperature of the unit. Specifically, as shown in fig. 10, a household water machine orThe intelligent defrosting control method under the heating working conditions of the air source heat pump and other units further comprises the following steps: step 81, if the absolute moisture content d of the outdoor air is less than or equal to the moisture content d min If the relation of (2) is established, the suction temperature T of the compressor 7 corresponding to the low pressure sensor 15 is read l Step 82 is then performed to determine the suction temperature T of the compressor 7 l The dry bulb temperature T is less than or equal to d Temperature C max Whether or not the relation of (c) is established.
In some embodiments, in step S320, when the current external pipe temperature of the unit is less than or equal to 0 ℃ and the interval in which the current outdoor air absolute humidity of the unit is in the set humidity range is the first humidity interval, a specific process of entering the preset defrosting mode of the unit is controlled according to the current suction air temperature of the compressor 7 and the current outdoor environment dry bulb temperature of the unit, which is described in the following exemplary description.
The following is a schematic flow chart of an embodiment of the method of the present invention for controlling the unit to enter the preset defrosting mode in the first humidity range in conjunction with fig. 4, further describing a specific process for controlling the unit to enter the preset defrosting mode in the first humidity range in step S320, where the specific process includes: step S410 to step S440.
Step S410, determining a difference value between the current outdoor environment dry bulb temperature of the unit and a first set temperature and recording the difference value as a first temperature threshold value under the condition that the current outer tube temperature of the unit is less than or equal to 0 ℃ and the interval where the current outdoor air absolute moisture content of the unit is in the set moisture content range is a first humidity interval. Wherein the first set temperature is temperature C max A first temperature threshold, e.g. dry bulb temperature T d Temperature C max 。
Step S420, determining whether the current suction temperature of the compressor 7 is less than or equal to a first temperature threshold value when the current outer pipe temperature of the unit is less than or equal to 0 ℃ and the interval in which the current outdoor air absolute humidity of the unit is in the set humidity range is a first humidity interval.
Step S430, if the current outer tube temperature of the unit is less than or equal to 0 ℃ and the section where the absolute humidity of the current outdoor air of the unit is in the set humidity range is the first humidity section, controlling the unit to enter a preset defrosting mode.
Step S440, if the current outside pipe temperature of the unit is less than or equal to 0 ℃ and the section of the absolute humidity of the current outdoor air of the unit in the set humidity range is the first humidity section, returning to re-determine whether the current suction temperature of the compressor 7 is less than or equal to the first temperature threshold value if the current suction temperature of the compressor 7 is determined to be greater than the first temperature threshold value.
Specifically, as shown in fig. 10, the intelligent defrosting control method under the heating working condition of the household water machine or the air source heat pump and other units further comprises the following steps:
step 82, judging the suction temperature T of the compressor 7 l The dry bulb temperature T is less than or equal to d Temperature C max Whether or not the relation of (2) holds: if yes, go to step 83, otherwise return to step 81.
Wherein the temperature C max When the absolute moisture content d of the outdoor air is low, the unit can enter a defrosting mode, and the outdoor environment temperature and the suction temperature T of the compressor 7 l The difference between different units and the value of different refrigerants will be different, and the scheme of the invention can temporarily control the temperature C max The value was 12 ℃.
Step 83, if the suction temperature T of the compressor 7 l The dry bulb temperature T is less than or equal to d Temperature C max If the relation of (2) is established, the unit enters a defrosting mode, and then step 84 is executed to read the fin temperature T of the outdoor heat exchanger 5 c 。
Step S330, if the section where the absolute humidity of the current outdoor air of the unit is within the set humidity range is determined to be the second humidity section under the condition that the current outer tube temperature of the unit is less than or equal to 0deg.C, according to the current suction superheat of the compressor 7, the current opening of the electronic expansion valve 8, the current suction of the compressor 7 And controlling the unit to enter a preset defrosting mode by the temperature and the current outdoor environment dry bulb temperature of the unit. Specifically, as shown in fig. 10, the intelligent defrosting control method under the heating working condition of the household water machine or the air source heat pump and other units further comprises the following steps: step 9, if the absolute moisture content d of the outdoor air is less than or equal to the moisture content d min If the relation of (2) is not established, the moisture content d is determined min <Absolute moisture content d of outdoor air is less than or equal to moisture content d mid Whether or not the relation of (2) holds: if yes, go to step 91, otherwise go to step 10 to determine the absolute moisture content d of the outdoor air>Moisture content d mid Whether or not the relationship of (2) is established. Wherein the moisture content d mid The absolute moisture content d of the outdoor air when the unit is easy to frost is defined, and the value of the absolute moisture content d is required to be determined according to the experimental data condition of the specific unit. Step 91, if moisture content d min <Absolute moisture content d of outdoor air is less than or equal to moisture content d mid If the relation of (2) is established, step 92 is executed to read the suction superheat a of the compressor 7 after the unit is stabilized.
In some embodiments, in step S330, in the case where the current outer tube temperature of the unit is less than or equal to 0 ℃ and the interval in which the current outdoor air absolute humidity of the unit is in the set humidity range is the second humidity interval, the specific process of entering the preset defrosting mode of the unit is controlled according to the current suction superheat degree of the compressor 7, the current opening degree of the electronic expansion valve 8, the current suction temperature of the compressor 7, and the current outdoor environment dry bulb temperature of the unit, see the following exemplary description.
The following is a schematic flow chart of an embodiment of the method of the present invention for controlling the unit to enter the preset defrosting mode in the second humidity range in conjunction with fig. 5, further describing a specific process for controlling the unit to enter the preset defrosting mode in the second humidity range in step S330, where the specific process includes: step S510 to step S550.
Step S510, determining whether the current suction superheat degree of the compressor 7 is greater than or equal to the difference between the set suction superheat degree and the set value, when the current outer tube temperature of the unit is less than or equal to 0 ℃ and the interval in which the current outdoor air absolute humidity of the unit is in the set humidity range is the second humidity interval. Wherein, the suction superheat degree is set as the suction superheat degree A set by the unit, and the set value is set as 1.
Step S520, when the current outer tube temperature of the unit is less than or equal to 0 ℃ and the interval where the current outdoor air absolute humidity of the unit is in the set humidity range is the second humidity interval, if it is determined that the current suction superheat degree of the compressor 7 is greater than or equal to the difference between the set suction superheat degree and the set value, controlling the current opening of the electronic expansion valve 8 to increase by the set opening to obtain a new current opening of the electronic expansion valve 8, and returning to redetermine whether the current suction superheat degree of the compressor 7 is greater than or equal to the difference between the set suction superheat degree and the set value. Wherein the opening degree is set as K i 。
Step S530, if the current outer tube temperature of the unit is less than or equal to 0 ℃ and the section where the absolute humidity of the current outdoor air of the unit is in the set humidity range is the second humidity section, determining the difference between the current outdoor environment dry bulb temperature of the unit and the second set temperature as the second temperature threshold value if the current suction superheat degree of the compressor 7 is determined to be less than the difference between the set suction superheat degree and the set value; and determining whether the current suction temperature of said compressor 7 is less than or equal to a second temperature threshold; wherein the second set temperature is less than the first set temperature. Wherein the second set temperature is temperature C mid A second temperature threshold, e.g. dry bulb temperature T d Temperature C mid 。
Step S540, when the current outer tube temperature of the unit is less than or equal to 0 ℃, the interval where the absolute humidity of the current outdoor air of the unit is in the set humidity range is the second humidity interval, and the current suction superheat of the compressor 7 is less than the difference between the set suction superheat and the set value, if it is determined that the current suction temperature of the compressor 7 is less than or equal to the second temperature threshold, controlling the unit to enter a preset defrosting mode.
Step S550, when the current outer tube temperature of the unit is less than or equal to 0 ℃, the interval in which the current outdoor air absolute humidity of the unit is in the set humidity range is the second humidity interval, and the current suction superheat of the compressor 7 is less than the difference between the set suction superheat and the set value, if it is determined that the current suction temperature of the compressor 7 is greater than the second temperature threshold, returning to re-determine whether the current suction temperature of the compressor 7 is less than or equal to the second temperature threshold.
Specifically, as shown in fig. 10, the intelligent defrosting control method under the heating working condition of the household water machine or the air source heat pump and other units further comprises the following steps:
step 92, the suction superheat a of the compressor 7 after the unit is stabilized is read, and then step 93 is executed.
Step 93, judging whether a relation formula of suction superheat degree a of the compressor 7 which is more than or equal to suction superheat degree A-1 set by the unit is established or not: if yes, go to step 94, otherwise go to step 95.
Wherein A is the set suction superheat degree of the unit, A-1 is the minimum allowable value of the suction superheat degree of the unit, and the value of A is determined according to parameters such as unit performance and the like, and can be generally 1-3.
Step 94, if the relation that the suction superheat degree a of the compressor 7 is equal to or greater than the suction superheat degree A-1 set by the unit is established, increasing the opening K=K+K of the electronic expansion valve 8 i And returns to the logic for reading the suction superheat a after the unit is stabilized in step 92. Wherein K is i The value can be taken for 5 steps.
Step 95, if the relation that the suction superheat degree a of the compressor 7 is not equal to or greater than the suction superheat degree A-1 set by the unit is not satisfied, reading the suction temperature T of the compressor 7 corresponding to the low pressure sensor 15 l Step 96 is then performed.
Step 96, judging the suction temperature T of the compressor 7 l The dry bulb temperature T is less than or equal to d Temperature C mid Whether or not the relation of (2) holds: if yes, go to step 97, otherwise return to step 95.
Wherein the temperature C mid When the unit can enter a defrosting mode when the absolute moisture content of the outdoor air is medium, the unit is in an outdoor environmentTemperature and suction temperature T of compressor 7 l The difference between different units and the value of different refrigerants will be different, and the scheme of the invention can temporarily control the temperature C mid The value was 10 ℃.
Step 97, if the suction temperature T of the compressor 7 l The dry bulb temperature T is less than or equal to d Temperature C mid If the relation of (2) is established, the unit enters a defrosting mode, and then step 98 is executed to read the fin temperature T of the outdoor heat exchanger 5 c 。
Step S340, if it is determined that the section where the absolute humidity of the current outdoor air of the unit is in the set humidity range is the third humidity section when the current outer tube temperature of the unit is less than or equal to 0 ℃, controlling the unit to enter the preset defrosting mode according to the current frequency of the compressor 7, the current air suction superheat degree of the compressor 7, the current opening degree of the electronic expansion valve 8, the current air suction temperature of the compressor 7, and the current outdoor environment dry bulb temperature of the unit. Specifically, as shown in fig. 10, the intelligent defrosting control method under the heating working condition of the household water machine or the air source heat pump and other units further comprises the following steps: step 10, if moisture content d min <Absolute moisture content d of outdoor air is less than or equal to moisture content d mid If the relation of (2) is not established, judging the absolute moisture content d of the outdoor air>Moisture content d mid Whether or not the relationship of (2) holds: if the absolute moisture content d of the outdoor air>Moisture content d mid If the relation of (2) is not satisfied, the step returns to the step 6 to read the dry ball temperature T corresponding to the dry ball pressure sensor 16 d And wet bulb temperature T w Logic in (2); if the absolute moisture content d of the outdoor air>Moisture content d mid If the relation of (2) is established, the frequency F of the compressor 7 after the stabilization of the unit is read, and then step 101 is performed to reduce the frequencies F to f=f of the compressor 7 max 。
In some embodiments, in step S340, in the case where the current outer tube temperature of the unit is less than or equal to 0 ℃ and the interval in which the current outdoor air absolute humidity of the unit is in the set humidity range is the third humidity interval, a specific process of the unit entering the preset defrosting mode is controlled according to the current frequency of the compressor 7, the current suction superheat of the compressor 7, the current opening degree of the electronic expansion valve 8, the current suction temperature of the compressor 7, and the current outdoor environment dry bulb temperature of the unit, see the following exemplary description.
The following is a schematic flow chart of an embodiment of the method of the present invention for controlling the unit to enter the preset defrosting mode in the third humidity range in conjunction with fig. 6, further describing a specific process for controlling the unit to enter the preset defrosting mode in the third humidity range in step S340, where the specific process includes: step S610 to step S670.
Step S610, determining whether the current frequency of the compressor 7 is greater than or equal to a set maximum frequency in the case that the current outer pipe temperature of the unit is less than or equal to 0 ℃ and the interval in which the current outdoor air absolute humidity of the unit is in the set humidity range is a third humidity interval. Wherein the maximum frequency is set as frequency F max 。
Step S620, when the current outer tube temperature of the unit is less than or equal to 0 ℃ and the interval in which the current outdoor air absolute humidity of the unit is in the set humidity range is the third humidity interval, if it is determined that the current frequency of the compressor 7 is greater than or equal to the set maximum frequency, reducing the current frequency of the compressor 7 to the set maximum frequency to obtain a new current frequency of the compressor 7, and then determining whether the current suction superheat degree of the compressor 7 is greater than or equal to the difference between the set suction superheat degree and the set value. Wherein, the suction superheat degree is set as the suction superheat degree A set by the unit, and the set value is set as 1.
In step S630, if the current outer tube temperature of the unit is less than or equal to 0 ℃ and the interval in which the absolute humidity of the current outdoor air of the unit is in the set humidity range is the third humidity interval, if it is determined that the current frequency of the compressor 7 is less than the set maximum frequency, it is determined whether the current suction superheat degree of the compressor 7 is greater than or equal to the difference between the set suction superheat degree and the set value.
Step S640, when the current outer tube temperature of the unit is less than or equal to 0 ℃, the interval in which the current outdoor air absolute humidity of the unit is in the set humidity range is the third humidity interval, and the current frequency of the compressor 7 is less than or equal to the set maximum frequency, if it is determined that the current suction superheat of the compressor 7 is greater than or equal to the difference between the set suction superheat and the set value, controlling the current opening of the electronic expansion valve 8 to increase by the set opening to obtain a new current opening of the electronic expansion valve 8, and returning to redetermine whether the current suction superheat of the compressor 7 is greater than or equal to the difference between the set suction superheat and the set value.
Step S650, when the current outer tube temperature of the unit is less than or equal to 0 ℃, the interval in which the current outdoor air absolute humidity of the unit is in the set humidity range is the third humidity interval, and the current frequency of the compressor 7 is less than or equal to the set maximum frequency, if it is determined that the current suction superheat degree of the compressor 7 is less than the difference between the set suction superheat degree and the set value, determining the difference between the current outdoor environment dry bulb temperature of the unit and the third set temperature, and recording the difference as the third temperature threshold; and determining whether the current suction temperature of said compressor 7 is less than or equal to a third temperature threshold; wherein the third set temperature is less than the second set temperature. Wherein the third set temperature is temperature C min A third temperature threshold, e.g. dry bulb temperature T d Temperature C min 。
Step S660, when the current outer tube temperature of the unit is less than or equal to 0 ℃, the interval in which the current outdoor air absolute humidity of the unit is in the set humidity range is the third humidity interval, the current frequency of the compressor 7 is less than or equal to the set maximum frequency, and the current suction superheat of the compressor 7 is less than the difference between the set suction superheat and the set value, if it is determined that the current suction temperature of the compressor 7 is less than or equal to the third temperature threshold, controlling the unit to enter the preset defrosting mode.
Step S670, when the current outer tube temperature of the unit is less than or equal to 0 ℃, the interval in which the current outdoor air absolute humidity of the unit is in the set humidity range is the third humidity interval, the current frequency of the compressor 7 is less than or equal to the set maximum frequency, and the current suction superheat of the compressor 7 is less than the difference between the set suction superheat and the set value, returning to re-determine whether the current suction temperature of the compressor 7 is less than or equal to the third temperature threshold if it is determined that the current suction temperature of the compressor 7 is greater than the third temperature threshold.
Specifically, as shown in fig. 10, the intelligent defrosting control method under the heating working condition of the household water machine or the air source heat pump and other units further comprises the following steps:
step 101, judging that F of the compressor 7 is more than or equal to F of frequency max Whether or not the relation of (2) holds: if F of compressor 7 is greater than or equal to frequency F max If the relation of (2) is established, the frequency F of the compressor 7 is reduced to f=f max And performs step 102; if F of compressor 7 is greater than or equal to frequency F max If the relation of (2) is not established, step 102 is directly performed. Wherein the frequency F max In order to ensure that the unit can run for a long time in a high humidity state and is not easy to frost, the values of different units are different, and the frequency F can be tentatively set according to experimental data max Is 60Hz.
Step 102, reading the suction superheat a of the compressor 7 after the unit is stabilized, and then executing step 103.
Step 103, judging whether a relation formula of suction superheat degree a of the compressor 7 is more than or equal to A-1 is established: if the relationship that the suction superheat a of the compressor 7 is equal to or greater than A-1 is established, the opening degree K=K+K of the electronic expansion valve 8 is increased i And returning to the logic of step 102 for reading the suction superheat a of the compressor 7 after the unit is stabilized; if the relationship that the suction superheat a of the compressor 7 is equal to or greater than A-1 is not established, step 104 is executed.
Step 104, reading the suction temperature T of the compressor 7 corresponding to the low pressure sensor 15 l Step 105 is then performed.
Step 105, judging suction temperature T of compressor 7 l The dry bulb temperature T is less than or equal to d Temperature C min Whether or not the relation of (2) holds: if the suction temperature T of the compressor 7 l Dry ball less than or equal toTemperature T d Temperature C min If the relation of (2) is not satisfied, the process returns to step 104 to read the suction temperature T corresponding to the low pressure sensor l Logic in (2); if the suction temperature T of the compressor 7 l The dry bulb temperature T is less than or equal to d Temperature C min If the relation of (2) is established, the unit enters a defrosting mode, and then step 106 is executed to read the fin temperature T of the outdoor heat exchanger 5 c 。
Wherein the temperature C min When the unit can enter a defrosting mode when the absolute moisture content of the outdoor air is high, the outdoor environment temperature and the suction temperature T of the compressor 7 are indicated l The difference between different units and the value of different refrigerants will be different, and the scheme of the invention can temporarily control the temperature C min The value was 8 ℃.
The scheme of the invention provides the method for controlling the dry bulb temperature T of the outdoor environment according to the absolute moisture content d of the outdoor air d And suction temperature T of compressor 7 l The difference is subjected to a step-by-step adjustment scheme to accurately estimate the frosting state of the unit, and different measures are taken for different moisture contents to reduce the frosting speed of the unit and lengthen the frosting period. In the scheme of the invention, the possibility of frosting of the unit is identified according to the absolute moisture content d of the outdoor air, and measures for increasing the opening degree of the electronic expansion valve 8 are adopted at medium humidity, and the measures for limiting the frequency of the compressor and increasing the opening degree of the electronic expansion valve 8 are cooperatively adopted at high humidity so as to prolong the frosting period of the unit.
In the scheme of the invention, the unit states are divided into three types of difficult frosting, easier frosting and very easy frosting according to the absolute moisture content d of outdoor air, and different frosting judgment conditions and frosting prevention measures are adopted in different unit states, so that the frosting logic and frosting prevention control are more targeted, the situation that the unit is cooled and heated to counteract and reduce the comprehensive energy efficiency of the unit due to the fact that frosting is less on fins or the unit enters a frosting mode can be prevented, and the comprehensive energy efficiency of the unit is improved.
Step S230, after the unit enters a preset defrosting mode, controlling the unit to exit the preset defrosting mode according to the current outer tube temperature of the unit so as to realize defrosting control of the unit.
In the scheme of the invention, the dry bulb temperature T of the outdoor environment is calculated according to the absolute moisture content d of the outdoor air d And suction temperature T of compressor 7 l The difference is adjusted in a grading manner to determine whether the unit enters a defrosting mode, so that the frosting state of the unit can be estimated more accurately, the unit intelligently enters the defrosting mode, the phenomena of defrosting in advance and defrosting out delay are prevented, and the comprehensive energy efficiency of the unit is improved.
In some embodiments, after the unit enters the preset defrosting mode in step S230, the unit is controlled to exit the preset defrosting mode according to the current external pipe temperature of the unit, so as to realize a specific process of defrosting control of the unit, which is described in the following exemplary description.
The following is a schematic flow chart of an embodiment of the method of the present invention in connection with fig. 7 for controlling the unit to exit the preset defrosting mode, further describing a specific process for controlling the unit to exit the preset defrosting mode in step S230, including: step S710 to step S730.
Step S710, after the unit enters a preset defrosting mode, determining whether the current outer tube temperature of the unit is greater than or equal to a fourth set temperature; wherein the fourth set temperature is greater than 0 and the third set temperature is less than the second set temperature. Wherein the third set temperature is temperature B.
Step S720, after the unit enters the preset defrosting mode, if it is determined that the current outer tube temperature of the unit is greater than or equal to the fourth set temperature, the unit is controlled to exit the preset defrosting mode, so as to realize defrosting control of the unit.
Step S730, after the unit enters the preset defrosting mode, if it is determined that the current outer tube temperature of the unit is less than the fourth set temperature, returning to determine whether the current outer tube temperature of the unit is greater than or equal to the fourth set temperature again.
Specifically, the absolute moisture content of the outdoor air is set at the current state of the unitUnder the condition that the section in the moisture content range is the first humidity section, after the unit enters a preset defrosting mode, as shown in fig. 10, the intelligent defrosting control method under the heating working condition of the unit such as the household water machine or the air source heat pump further comprises the following steps: step 84, reading the fin temperature T of the outdoor heat exchanger 5 c Step 85 is then performed. Step 85, judging the fin temperature T of the outdoor heat exchanger 5 c Whether or not the relation of the temperature B is satisfied: if yes, the unit exits the defrosting mode and returns to the step 6, otherwise, the unit returns to the step 84. The value of the temperature B is required to be larger than 0, but in order to ensure defrosting cleanliness, the value of the temperature B can be about 10 ℃. If the fin temperature T of the outdoor heat exchanger 5 c If the relation of the temperature B is not satisfied, the temperature T of the fins of the outdoor heat exchanger 5 is read back c Logic in (2); if the fin temperature T of the outdoor heat exchanger 5 c T is greater than or equal to temperature B c If the temperature B is not less than the preset value, the unit can exit the defrosting mode and return to the step 6 to read the dry ball temperature T corresponding to the dry ball pressure sensor 16 d And wet bulb temperature T w Logic of (3).
When the interval where the absolute humidity of the current outdoor air of the unit is in the set humidity range is the first humidity interval, after the unit enters the preset defrosting mode, as shown in fig. 10, the intelligent defrosting control method under the heating working condition of the unit such as the household water machine or the air source heat pump further comprises: step 98, reading the fin temperature T of the outdoor heat exchanger 5 c And determines the fin temperature T of the outdoor heat exchanger 5 c Whether or not the relation of the temperature B is satisfied: if the fin temperature T of the outdoor heat exchanger 5 c If the relation of the temperature B is not satisfied, returning to the step 98 to read the fin temperature T c Logic in (2); if the fin temperature T of the outdoor heat exchanger 5 c If the relation of the temperature B is not less than, the unit can exit the defrosting mode, and return to the step 6 to read the dry ball temperature T corresponding to the dry ball pressure sensor 16 d And wet bulb temperature T w Logic of (3).
The section of the unit where the absolute moisture content of the current outdoor air is in the set moisture content range is the first sectionUnder the condition of a humidity interval, after the unit enters a preset defrosting mode, as shown in fig. 10, the intelligent defrosting control method under the heating condition of the unit such as the household water machine or the air source heat pump further comprises the following steps: step 106, reading the fin temperature T of the outdoor heat exchanger 5 c And judges the T of the outdoor heat exchanger 5 c Whether or not the relation of the temperature B is satisfied: if T of the outdoor heat exchanger 5 c If the relation of the temperature B is not satisfied, returning to the step 106 to read the fin temperature T c Logic in (2); if T of the outdoor heat exchanger 5 c If the relation of the temperature B is not less than, the unit can exit the defrosting mode, and return to the step 6 to read the dry ball temperature T corresponding to the dry ball pressure sensor 16 d And wet bulb temperature T w Logic of (3).
According to the scheme, defrosting is not regulated by time, defrosting difficulty is graded according to the absolute moisture content of outdoor air, whether a unit enters defrosting is judged by the difference between the dry bulb temperature of an outdoor environment and the suction temperature of the compressor 7, and the frosting state of the unit can be more intelligently identified by different measures of preventing frosting (such as increasing the opening degree of the electronic expansion valve 8, limiting frequency and the like) of different moisture contents and different frosting entering conditions; and judging whether to defrost according to the air suction temperature of the compressor 7 and the opening of the electronic expansion valve 8, so that the method is suitable for defrosting in areas with different climates and can avoid the occurrence of false defrosting. The defrosting control strategy provided by the scheme of the invention can avoid the problems of mistaken defrosting and incomplete defrosting in a high-humidity area, saves energy and improves the heating effect.
By adopting the technical scheme of the embodiment, after the water inlet temperature of the unit such as the household water machine or the air source heat pump meets the starting condition of the unit, the unit is controlled to start and operate; under the condition that the fin temperature of the outdoor heat exchanger 5 is smaller than or equal to 0, determining the absolute moisture content of outdoor air according to the dry bulb temperature and the wet bulb temperature at the outdoor heat exchanger 5, and determining the time when a unit enters a defrosting mode and exits the defrosting mode in a grading manner according to the section where the absolute moisture content of the outdoor air is in a set moisture content range and by combining the corresponding parameters in the air suction temperature of the compressor 7, the fin temperature of the outdoor heat exchanger 5, the air suction superheat degree of the compressor 7 and the frequency of the compressor 7, so that different defrosting judging conditions and anti-frosting measures are adopted in different unit states, and accurate frosting is realized; therefore, the frosting state of the unit is estimated more accurately by combining the absolute moisture content of the outdoor air and the suction temperature of the compressor 7, the intelligent frosting of the unit is controlled, and the comprehensive energy efficiency of the unit is improved.
According to an embodiment of the present invention, there is also provided a defrosting control device of a unit corresponding to the defrosting control method of a unit. Referring to fig. 8, a schematic diagram of an embodiment of the apparatus of the present invention is shown. The unit is provided with an outdoor unit and an indoor unit; the outdoor unit includes: a compressor 7, an outdoor heat exchanger 5, and an electronic expansion valve 8; the indoor unit includes: an indoor heat exchanger 3; the indoor heat exchanger 3 is provided with a water side heat exchange pipeline and a refrigerant side heat exchange pipeline; the exhaust port of the compressor 7 returns to the air inlet of the compressor 7 after passing through the refrigerant side heat exchange line of the indoor heat exchanger 3, the outdoor heat exchanger 5, the electronic expansion valve 8, and the outdoor heat exchanger 5.
Specifically, fig. 9 is a schematic structural diagram of an embodiment of a household water machine. The household water machine as shown in fig. 9 comprises: the device comprises a water outlet temperature sensing bulb 1, a gas-liquid separator 2, an indoor heat exchanger 3, a water pump 4, an outdoor heat exchanger 5, a liquid reservoir 6, a compressor 7, an electronic expansion valve 8, a fin temperature sensing bulb 9, a four-way valve 10, a water inlet temperature sensing bulb 11, a controller 12, a temperature controller 13, a communication line 14, a low pressure sensor 15 and a dry-wet ball pressure sensor 16. The indoor heat exchanger 3 has a water-side heat exchange line and a refrigerant-side heat exchange line. The discharge port of the compressor 7 is connected to the fourth port of the four-way valve 10. The first port of the four-way valve 10 is communicated with the third port of the four-way valve 10 after passing through the refrigerant side heat exchange pipeline of the indoor heat exchanger 3, the electronic expansion valve 8, the liquid storage 6 and the outdoor heat exchanger 5. The second port of the four-way valve 10 passes through the gas-liquid separator 2 and returns to the intake port of the compressor 7. The outdoor heat exchanger 5 is provided with a wet and dry ball pressure sensor 16. A water pump 4 and a water inlet temperature sensing bulb 11 are arranged on a water inlet pipeline of a water side heat exchange pipeline of the indoor heat exchanger 3. A water outlet temperature sensing bulb 1 is arranged on a water outlet pipeline of the water side heat exchange pipeline of the indoor heat exchanger 3. A low pressure sensor 15 is provided in the intake port of the compressor 7. The outdoor heat exchanger 5 is provided with a fin bulb 9. The fin temperature sensing bulb 9 is connected with the controller 12. The controller 12 is connected with the temperature controller 13 through a communication line 14.
In the solution of the present invention, as shown in fig. 8, the defrosting control device of the unit includes: an acquisition unit 202 and a control unit 204.
The obtaining unit 202 is configured to obtain, when receiving a start-up instruction of the unit, a temperature of a pipeline where a water inlet of the water side heat exchange pipeline of the indoor heat exchanger 3 is located, where the temperature is recorded as a current water inlet temperature of the unit, such as a water inlet temperature T of the unit Water and its preparation method . The specific function and processing of the acquisition unit 202 are described in step S110.
Specifically, fig. 10 is a schematic control flow diagram of an embodiment of an intelligent frost control method under a heating condition of a household water machine or an air source heat pump. As shown in fig. 10, the intelligent defrosting control method under the heating condition of the household water machine or the air source heat pump and other units comprises the following steps: step 1, when a unit is started, a heating mode is set, and a user sets a target water outlet temperature T Effluent water Step 2 is then performed. Step 2, reading the water inlet temperature T of the unit Water and its preparation method For example, the temperature T of the water inlet of the water side heat exchange pipeline of the indoor heat exchanger 3 detected by the water inlet temperature sensing bulb 11 is read Water and its preparation method Then, step 3 is executed to adjust the water inlet temperature T of the unit Water and its preparation method And controlling the starting up of the unit.
The control unit 204 is configured to control the unit to start and operate when the current water inlet temperature of the unit is within the set water inlet temperature range. The specific function and process of the control unit 204 refer to step S120.
Specifically, as shown in fig. 10, the intelligent defrosting control method under the heating working condition of the household water machine or the air source heat pump and other units further comprises the following steps: step 3, the temperature controller 13 is used for controlling the water inlet temperature T of the unit Water and its preparation method Judging whether the starting conditions of the unit are met: if the water inlet temperature T of the unit Water and its preparation method If the starting condition of the unit is not met, returning to the step 2 to read the water inlet temperature T of the water tank again Water and its preparation method Until the starting condition of the unit is met; if the water inlet temperature T of the unit Water and its preparation method And (4) if the starting condition of the unit is met, executing the step (4). Wherein, if the water inlet temperature T of the unit Water and its preparation method In the case of setting the water inlet temperature range, then the water inlet temperature T of the unit is determined Water and its preparation method Meets the starting conditions of the machine set. Step 4, the temperature controller 13 controls the machine set to start up, and then step 5 is executed to read the fin temperature T of the outdoor heat exchanger 5 c 。
The obtaining unit 202 is further configured to obtain, under the condition of the unit operation, the fin temperature of the outdoor heat exchanger 5, and record the fin temperature as the current outer tube temperature of the unit, such as the fin taking temperature T of the outdoor heat exchanger 5 c The method comprises the steps of carrying out a first treatment on the surface of the Acquiring the temperature of the pipeline of the air suction port of the compressor 7 and recording the temperature as the current air suction temperature of the compressor 7, such as reading the air suction temperature T of the compressor 7 corresponding to the low pressure sensor 15 l The method comprises the steps of carrying out a first treatment on the surface of the Acquiring the dry bulb temperature and the wet bulb temperature of the outdoor heat exchanger 5, and recording the dry bulb temperature and the wet bulb temperature as the current outdoor environment dry bulb temperature of the unit and the current outdoor environment wet bulb temperature of the unit, for example, reading the dry bulb temperature T of the outdoor heat exchanger 5 corresponding to the dry bulb pressure sensor 16 d And wet bulb temperature T w The method comprises the steps of carrying out a first treatment on the surface of the Acquiring the current suction superheat degree of the compressor 7, for example, reading the suction superheat degree a of the compressor 7 after the unit is stable; acquiring the current frequency of the compressor 7, such as the frequency F of the compressor 7; and acquires the current opening degree of the electronic expansion valve 8, such as the opening degree K of the electronic expansion valve 8. The specific function and processing of the acquisition unit 202 is also referred to in step S130.
Specifically, as shown in fig. 10, the intelligent defrosting control method under the heating working condition of the household water machine or the air source heat pump and other units further comprises the following steps: step 5, reading the fin temperature T of the outdoor heat exchanger 5 c For example, the fin temperature T of the outdoor heat exchanger 5 detected by the fin bulb 9 is read c Step 6 is then performed. Step 6, judging the fin temperature T of the outdoor heat exchanger 5 c Whether the relation of less than or equal to 0 is established: if the fin temperature T of the outdoor heat exchanger 5 c If the relation less than or equal to 0 is not established, the condition that the fins of the outdoor heat exchanger 5 of the unit are free from frosting risks is indicated, the unit returns to the circulation of normal operation of the unit, and the step 5 is returned to continue reading the fin taking temperature T of the outdoor heat exchanger 5 c The method comprises the steps of carrying out a first treatment on the surface of the If the fin temperature T of the outdoor heat exchanger 5 c If the relation of less than or equal to 0 is established, the dry ball temperature T at the outdoor heat exchanger 5 corresponding to the dry ball pressure sensor 16 is read d And wet bulb temperature T w Step 7 is then performed to determine the dry bulb temperature T d And wet bulb temperature T w The corresponding absolute moisture content d of the outdoor air is calculated. Wherein the dry-wet ball pressure sensor 16 can detect the dry-ball pressure and the wet-ball pressure, and can determine the dry-ball temperature T according to the corresponding relation between the set dry-ball pressure and the set dry-ball temperature d The wet bulb temperature T can be determined according to the corresponding relation between the set wet bulb pressure and the set wet bulb temperature w 。
The control unit 204 is further configured to control the unit to enter and exit a preset defrosting mode to realize defrosting control of the unit in combination with a current outdoor environment dry bulb temperature of the unit, a current outdoor environment wet bulb temperature of the unit, a current suction temperature of the compressor 7, a current suction superheat degree of the compressor 7, a current frequency of the compressor 7, a current opening of the electronic expansion valve 8, and a current outer tube temperature of the unit when the current outer tube temperature of the unit is less than or equal to 0 ℃. The specific function and processing of the control unit 204 also refer to step S140.
The scheme of the invention provides an intelligent defrosting control scheme under the heating working conditions of a household water machine or an air source heat pump and other units, and as the outdoor heat exchanger 5 of the unit blocks a fin channel after frosting, the heat resistance of the outdoor heat exchanger 5 is increased, so that the evaporation side pressure (namely the low pressure of the compressor 7) of the unit is reduced, the saturation temperature corresponding to the low pressure of the compressor 7 is also reduced, and therefore, the scheme of the invention identifies whether the unit enters a defrosting mode according to the difference between the dry bulb temperature of the outdoor environment and the air suction temperature of the compressor 7. However, it has been found experimentally that when the difference between the dry bulb temperature of the outdoor environment and the suction temperature of the compressor 7 is the same, thenThe frosting state of the fins of the outdoor heat exchanger 5 varies with the absolute moisture content of the outdoor air, specifically, the frosting is thicker when the absolute moisture content of the outdoor air is higher and the frosting is smaller when the absolute moisture content of the outdoor air is lower. Therefore, the scheme of the invention uses the dry bulb temperature T of the outdoor environment according to the absolute moisture content d of the outdoor air d And the suction temperature of the compressor 7 l The method can accurately identify the frosting state of the unit by performing hierarchical adjustment, prevent the unit from frequently switching the frosting mode when frosting is less, reduce unnecessary frosting operation and effectively save the energy consumption of the unit. Meanwhile, the scheme of the invention increases the anti-frosting measure at the medium humidity and the high humidity, and comprises the following steps: the opening of the electronic expansion valve 8 is increased, the frequency of the compressor 7 is limited, and the defrosting period is prolonged to the maximum extent by adjusting the unit parameters.
In some embodiments, the control unit 204, in combination with the current outdoor environment dry bulb temperature of the unit, the current outdoor environment wet bulb temperature of the unit, the current suction temperature of the compressor 7, the current suction superheat of the compressor 7, the current frequency of the compressor 7, the current opening of the electronic expansion valve 8, and the current outer tube temperature of the unit, controls the unit to enter and exit a preset defrosting mode to realize defrosting control of the unit when the current outer tube temperature of the unit is less than or equal to 0 ℃, includes:
the control unit 204 is specifically further configured to determine, when the current external pipe temperature of the unit is less than or equal to 0 ℃, the current absolute humidity of the outdoor air of the unit according to the current outdoor environment dry bulb temperature of the unit and the current outdoor environment wet bulb temperature of the unit, e.g. to read the dry bulb temperature T at the outdoor heat exchanger 5 corresponding to the dry-wet bulb pressure sensor 16 d And wet bulb temperature T w According to the dry bulb temperature T d And wet bulb temperature T w The corresponding absolute moisture content d of the outdoor air is calculated. The specific function and processing of the control unit 204 is also referred to in step S210. Specifically, as shown in fig. 10, intelligent frost control in heating operation of a household water machine or an air source heat pump The method further comprises the steps of: step 7, according to the dry bulb temperature T d And wet bulb temperature T w Calculating the corresponding absolute moisture content d of the outdoor air, and then executing step 8 to judge that the absolute moisture content d of the outdoor air is less than or equal to the moisture content d min Whether or not the relation of (c) is established. Wherein, based on the dry bulb temperature T d And wet bulb temperature T w The corresponding absolute moisture content d of the outdoor air can be obtained according to the corresponding relation among the set dry bulb temperature, the set wet bulb temperature and the set absolute moisture content of the outdoor air.
The control unit 204 is specifically further configured to control the unit to enter a preset defrosting mode according to a section where the absolute humidity of the current outdoor air of the unit is in a set humidity range when the current outer pipe temperature of the unit is less than or equal to 0 ℃, in combination with the current outdoor environment dry bulb temperature of the unit, the current outdoor environment wet bulb temperature of the unit, the current air suction temperature of the compressor 7, the current air suction superheat degree of the compressor 7, the current frequency of the compressor 7, and the current opening of the electronic expansion valve 8. The specific function and process of the control unit 204 also refer to step S220.
The control unit 204 is specifically further configured to control the unit to exit from the preset defrosting mode according to the current outer tube temperature of the unit after the unit enters the preset defrosting mode, so as to realize defrosting control of the unit. The specific function and process of the control unit 204 also refer to step S230.
In the scheme of the invention, the dry bulb temperature T of the outdoor environment is calculated according to the absolute moisture content d of the outdoor air d And suction temperature T of compressor 7 l The difference is adjusted in a grading manner to determine whether the unit enters a defrosting mode, so that the frosting state of the unit can be estimated more accurately, the unit intelligently enters the defrosting mode, the phenomena of defrosting in advance and defrosting out delay are prevented, and the comprehensive energy efficiency of the unit is improved.
In some embodiments, setting the moisture content range includes: an outdoor air moisture content range divided by a first set moisture content and a second set moisture content, a firstSetting a moisture content such as moisture content d min A second set moisture content such as moisture content d mid The method comprises the steps of carrying out a first treatment on the surface of the The section of the unit, in which the absolute moisture content of the current outdoor air is smaller than or equal to the first set moisture content, is a first humidity section, the section of the unit, in which the absolute moisture content of the current outdoor air is larger than the first set moisture content and smaller than or equal to the second set moisture content, is a second humidity section, and the section of the unit, in which the absolute moisture content of the current outdoor air is larger than the second set moisture content, is a third humidity section.
The control unit 204, when the current outer tube temperature of the unit is less than or equal to 0 ℃, controls the unit to enter a preset defrosting mode according to a section where the absolute humidity of the current outdoor air of the unit is in a set humidity range, in combination with the current outdoor environment dry bulb temperature of the unit, the current outdoor environment wet bulb temperature of the unit, the current air suction temperature of the compressor 7, the current air suction superheat degree of the compressor 7, the current frequency of the compressor 7, and the current opening degree of the electronic expansion valve 8, and includes:
The control unit 204 is in particular further configured to determine a section in which the current absolute humidity of the outdoor air of the unit is in the set humidity range, in case the current outside pipe temperature of the unit is less than or equal to 0 ℃. The specific function and process of the control unit 204 also refer to step S310. Specifically, as shown in fig. 10, the intelligent defrosting control method under the heating working condition of the household water machine or the air source heat pump and other units further comprises the following steps: step 8, judging that the absolute moisture content d of the outdoor air is less than or equal to the moisture content d min Whether or not the relation of (2) holds: if yes, go to step 81 to read the suction temperature T of the compressor 7 corresponding to the low pressure sensor 15 l Otherwise, go to step 9 to determine the moisture content d min <Absolute moisture content d of outdoor air is less than or equal to moisture content d mid Whether or not the relation of (c) is established. Wherein the moisture content d min The absolute moisture content of outdoor air when the unit is not easy to frost is referred to, and the value of the absolute moisture content is required to be determined according to the experimental data condition of the specific unit.
The control unit 204 is specifically further configured to, in particular, controlAnd if the section where the absolute moisture content of the current outdoor air of the unit is in the set moisture content range is determined to be the first humidity section under the condition that the current outer pipe temperature of the unit is less than or equal to 0 ℃, controlling the unit to enter a preset defrosting mode according to the current air suction temperature of the compressor 7 and the current outdoor environment dry bulb temperature of the unit. The specific function and processing of the control unit 204 is also referred to in step S320. Specifically, as shown in fig. 10, the intelligent defrosting control method under the heating working condition of the household water machine or the air source heat pump and other units further comprises the following steps: step 81, if the absolute moisture content d of the outdoor air is less than or equal to the moisture content d min If the relation of (2) is established, the suction temperature T of the compressor 7 corresponding to the low pressure sensor 15 is read l Step 82 is then performed to determine the suction temperature T of the compressor 7 l The dry bulb temperature T is less than or equal to d Temperature C max Whether or not the relation of (c) is established.
In some embodiments, the control unit 204 controls the unit to enter a preset defrosting mode according to the current suction temperature of the compressor 7 and the current outdoor environment dry bulb temperature of the unit, in the case that the current external tube temperature of the unit is less than or equal to 0 ℃ and the interval in which the current outdoor air absolute humidity of the unit is in the set humidity range is the first humidity interval, including:
the control unit 204 is specifically further configured to determine, when the current external pipe temperature of the unit is less than or equal to 0 ℃ and the interval in which the absolute humidity of the current outdoor air of the unit is in the set humidity range is the first humidity interval, a difference between the current outdoor environment dry bulb temperature of the unit and the first set temperature, and record the difference as the first temperature threshold. The specific function and processing of the control unit 204 is also referred to in step S410. Wherein the first set temperature is temperature C max A first temperature threshold, e.g. dry bulb temperature T d Temperature C max 。
The control unit 204 is specifically further configured to determine whether the current suction temperature of the compressor 7 is less than or equal to a first temperature threshold value, in case the current outer tube temperature of the unit is less than or equal to 0 ℃, and the interval in which the current outdoor air absolute moisture content of the unit is in the set moisture content range is a first humidity interval. The specific function and process of the control unit 204 also refer to step S420.
The control unit 204 is specifically further configured to control the unit to enter a preset defrosting mode if it is determined that the current suction temperature of the compressor 7 is less than or equal to the first temperature threshold value, in the case that the current external pipe temperature of the unit is less than or equal to 0 ℃ and the interval in which the current outdoor air absolute humidity of the unit is in the set humidity range is the first humidity interval. The specific function and processing of the control unit 204 is also referred to in step S430.
The control unit 204 is specifically further configured to, in the case where the current outside pipe temperature of the unit is less than or equal to 0 ℃ and the section where the current outside air absolute humidity of the unit is in the set humidity range is the first humidity section, return to re-determine whether the current suction air temperature of the compressor 7 is less than or equal to the first temperature threshold if it is determined that the current suction air temperature of the compressor 7 is greater than the first temperature threshold. The specific function and processing of the control unit 204 is also referred to in step S440.
Specifically, as shown in fig. 10, the intelligent defrosting control method under the heating working condition of the household water machine or the air source heat pump and other units further comprises the following steps:
step 82, judging the suction temperature T of the compressor 7 l The dry bulb temperature T is less than or equal to d Temperature C max Whether or not the relation of (2) holds: if yes, go to step 83, otherwise return to step 81.
Wherein the temperature C max When the absolute moisture content d of the outdoor air is low, the unit can enter a defrosting mode, and the outdoor environment temperature and the suction temperature T of the compressor 7 l The difference between different units and the value of different refrigerants will be different, and the scheme of the invention can temporarily control the temperature C max The value was 12 ℃.
Step 83, if the suction temperature T of the compressor 7 l The dry bulb temperature T is less than or equal to d Temperature C max Is a relation of (2)If so, the unit enters a defrosting mode, and then step 84 is executed to read the fin temperature T of the outdoor heat exchanger 5 c 。
The control unit 204 is specifically further configured to, if it is determined that the section where the absolute humidity of the current outdoor air of the unit is in the set humidity range is the second humidity section when the current outer tube temperature of the unit is less than or equal to 0 ℃, control the unit to enter a preset defrosting mode according to the current suction superheat degree of the compressor 7, the current opening degree of the electronic expansion valve 8, the current suction temperature of the compressor 7, and the current outdoor environment dry bulb temperature of the unit. The specific function and process of the control unit 204 also refer to step S330. Specifically, as shown in fig. 10, the intelligent defrosting control method under the heating working condition of the household water machine or the air source heat pump and other units further comprises the following steps: step 9, if the absolute moisture content d of the outdoor air is less than or equal to the moisture content d min If the relation of (2) is not established, the moisture content d is determined min <Absolute moisture content d of outdoor air is less than or equal to moisture content d mid Whether or not the relation of (2) holds: if yes, go to step 91, otherwise go to step 10 to determine the absolute moisture content d of the outdoor air>Moisture content d mid Whether or not the relationship of (2) is established. Wherein the moisture content d mid The absolute moisture content d of the outdoor air when the unit is easy to frost is defined, and the value of the absolute moisture content d is required to be determined according to the experimental data condition of the specific unit. Step 91, if moisture content d min <Absolute moisture content d of outdoor air is less than or equal to moisture content d mid If the relation of (2) is established, step 92 is executed to read the suction superheat a of the compressor 7 after the unit is stabilized.
In some embodiments, the control unit 204 controls the unit to enter a preset defrosting mode according to a current suction superheat degree of the compressor 7, a current opening degree of the electronic expansion valve 8, a current suction temperature of the compressor 7, and a current outdoor environment dry bulb temperature of the unit, in a case that a current external pipe temperature of the unit is less than or equal to 0 ℃ and a section in which a current outdoor air absolute humidity of the unit is located in a set humidity range is a second humidity section, including:
the control unit 204 is specifically further configured to determine whether the current suction superheat degree of the compressor 7 is greater than or equal to a difference between the set suction superheat degree and the set value, in the case where the current outer tube temperature of the unit is less than or equal to 0 ℃ and the section where the current outdoor air absolute moisture content of the unit is in the set moisture content range is the second humidity section. The specific function and processing of the control unit 204 is also referred to in step S510. Wherein, the suction superheat degree is set as the suction superheat degree A set by the unit, and the set value is set as 1.
The control unit 204 is specifically further configured to, when the current outer tube temperature of the unit is less than or equal to 0 ℃ and the interval in which the absolute humidity of the current outdoor air of the unit is in the set humidity range is the second humidity interval, control the current opening of the electronic expansion valve 8 to increase by a set opening to obtain a new current opening of the electronic expansion valve 8 if it is determined that the current suction superheat of the compressor 7 is greater than or equal to the difference between the set suction superheat and the set value, and then return to re-determine whether the current suction superheat of the compressor 7 is greater than or equal to the difference between the set suction superheat and the set value. The specific function and process of the control unit 204 also refer to step S520. Wherein the opening degree is set as K i 。
The control unit 204 is specifically further configured to determine, when the current outer tube temperature of the unit is less than or equal to 0 ℃ and the interval in which the absolute humidity of the current outdoor air of the unit is in the set humidity range is the second humidity interval, if it is determined that the current suction superheat degree of the compressor 7 is less than the difference between the set suction superheat degree and the set value, the difference between the current outdoor environment dry bulb temperature of the unit and the second set temperature is recorded as the second temperature threshold; and determining whether the current suction temperature of said compressor 7 is less than or equal to a second temperature threshold; wherein the second set temperature is less than the first set temperature. The specific function and processing of the control unit 204 is also referred to in step S530. Wherein the second set temperature is temperature C mid A second temperature threshold, e.g. dry bulb temperature T d Temperature C mid 。
The control unit 204 is specifically further configured to control the unit to enter a preset defrosting mode if it is determined that the current suction air temperature of the compressor 7 is less than or equal to the second temperature threshold value, in the case that the current outer tube temperature of the unit is less than or equal to 0 ℃, the interval in which the current outdoor air absolute humidity of the unit is in the set humidity range is the second humidity interval, and the current suction superheat of the compressor 7 is less than the difference between the set suction superheat and the set value. The specific function and processing of the control unit 204 is also referred to in step S530.
The control unit 204 is specifically further configured to, when the current outer tube temperature of the unit is less than or equal to 0 ℃, the interval in which the absolute humidity of the current outdoor air of the unit is in the set humidity range is the second humidity interval, and the current suction superheat of the compressor 7 is less than the difference between the set suction superheat and the set value, return to re-determine whether the current suction temperature of the compressor 7 is less than or equal to the second temperature threshold if it is determined that the current suction temperature of the compressor 7 is greater than the second temperature threshold. The specific function and processing of the control unit 204 is also referred to in step S540.
Specifically, as shown in fig. 10, the intelligent defrosting control method under the heating working condition of the household water machine or the air source heat pump and other units further comprises the following steps:
step 92, the suction superheat a of the compressor 7 after the unit is stabilized is read, and then step 93 is executed.
Step 93, judging whether a relation formula of suction superheat degree a of the compressor 7 which is more than or equal to suction superheat degree A-1 set by the unit is established or not: if yes, go to step 94, otherwise go to step 95.
Wherein A is the set suction superheat degree of the unit, A-1 is the minimum allowable value of the suction superheat degree of the unit, and the value of A is determined according to parameters such as unit performance and the like, and can be generally 1-3.
Step 94, if the relation that the suction superheat degree a of the compressor 7 is equal to or greater than the suction superheat degree A-1 set by the unit is established, increasing the opening K=K+K of the electronic expansion valve 8 i And return to step 92 after the unit is stabilizedThe logic of the suction superheat a is read. Wherein K is i The value can be taken for 5 steps.
Step 95, if the relation that the suction superheat degree a of the compressor 7 is not equal to or greater than the suction superheat degree A-1 set by the unit is not satisfied, reading the suction temperature T of the compressor 7 corresponding to the low pressure sensor 15 l Step 96 is then performed.
Step 96, judging the suction temperature T of the compressor 7 l The dry bulb temperature T is less than or equal to d Temperature C mid Whether or not the relation of (2) holds: if yes, go to step 97, otherwise return to step 95.
Wherein the temperature C mid When the unit can enter the defrosting mode when the absolute moisture content of the outdoor air is medium, the outdoor environment temperature and the suction temperature T of the compressor 7 are calculated l The difference between different units and the value of different refrigerants will be different, and the scheme of the invention can temporarily control the temperature C mid The value was 10 ℃.
Step 97, if the suction temperature T of the compressor 7 l The dry bulb temperature T is less than or equal to d Temperature C mid If the relation of (2) is established, the unit enters a defrosting mode, and then step 98 is executed to read the fin temperature T of the outdoor heat exchanger 5 c 。
The control unit 204 is specifically further configured to, if it is determined that the interval in which the absolute humidity of the current outdoor air of the unit is in the set humidity range is the third humidity interval, control the unit to enter the preset defrosting mode according to the current frequency of the compressor 7, the current suction superheat degree of the compressor 7, the current opening degree of the electronic expansion valve 8, the current suction temperature of the compressor 7, and the current outdoor environment dry bulb temperature of the unit, where the current outer tube temperature of the unit is less than or equal to 0 ℃. The specific function and processing of the control unit 204 is also referred to in step S340. Specifically, as shown in fig. 10, the intelligent defrosting control method under the heating working condition of the household water machine or the air source heat pump and other units further comprises the following steps: step 10, if moisture content d min <Absolute moisture content d of outdoor air is less than or equal to moisture content d mid If the relation of (2) is not established, judging the absolute moisture content d of the outdoor air>Moisture-containingQuantity d mid Whether or not the relationship of (2) holds: if the absolute moisture content d of the outdoor air>Moisture content d mid If the relation of (2) is not satisfied, the step returns to the step 6 to read the dry ball temperature T corresponding to the dry ball pressure sensor 16 d And wet bulb temperature T w Logic in (2); if the absolute moisture content d of the outdoor air>Moisture content d mid If the relation of (2) is established, the frequency F of the compressor 7 after the stabilization of the unit is read, and then step 101 is performed to reduce the frequencies F to f=f of the compressor 7 max 。
In some embodiments, the control unit 204 controls the unit to enter a preset defrosting mode according to a current frequency of the compressor 7, a current suction superheat degree of the compressor 7, a current opening degree of the electronic expansion valve 8, a current suction temperature of the compressor 7, and a current outdoor environment dry bulb temperature of the unit, in a case that a current external pipe temperature of the unit is less than or equal to 0 ℃ and a section in which a current outdoor air absolute humidity of the unit is located in a set humidity range is a third humidity section, including:
the control unit 204 is specifically further configured to determine whether the current frequency of the compressor 7 is greater than or equal to a set maximum frequency, in the case where the current outside pipe temperature of the unit is less than or equal to 0 ℃ and the section where the current outside air absolute humidity of the unit is in the set humidity range is a third humidity section. The specific function and processing of the control unit 204 is also referred to in step S610. Wherein the maximum frequency is set as frequency F max 。
The control unit 204 is specifically further configured to, when the current outer tube temperature of the unit is less than or equal to 0 ℃ and the interval in which the absolute humidity of the current outdoor air of the unit is in the set humidity range is the third humidity interval, decrease the current frequency of the compressor 7 to the set maximum frequency if it is determined that the current frequency of the compressor 7 is greater than or equal to the set maximum frequency, obtain a new current frequency of the compressor 7, and then determine whether the current suction superheat of the compressor 7 is greater than or equal to the difference between the set suction superheat and the set value. The specific function and processing of the control unit 204 is also referred to in step S620. Wherein, the suction superheat degree is set as the suction superheat degree A set by the unit, and the set value is set as 1.
The control unit 204 is specifically further configured to determine, if it is determined that the current frequency of the compressor 7 is less than the set maximum frequency, whether the current suction superheat degree of the compressor 7 is greater than or equal to a difference between the set suction superheat degree and the set value, in a case where the current outer tube temperature of the unit is less than or equal to 0 ℃ and a section where the current outdoor air absolute humidity of the unit is located in the set humidity range is a third humidity section. The specific function and processing of the control unit 204 is also referred to in step S630.
The control unit 204 is specifically further configured to, when the current outer tube temperature of the unit is less than or equal to 0 ℃, the interval in which the absolute humidity of the current outdoor air of the unit is in the set humidity range is the third humidity interval, and the current frequency of the compressor 7 is less than or equal to the set maximum frequency, control the current opening of the electronic expansion valve 8 to increase by the set opening if it is determined that the current suction superheat of the compressor 7 is greater than or equal to the difference between the set suction superheat and the set value, obtain a new current opening of the electronic expansion valve 8, and then return to redetermine whether the current suction superheat of the compressor 7 is greater than or equal to the difference between the set suction superheat and the set value. The specific function and process of the control unit 204 also refer to step S640.
The control unit 204 is specifically further configured to determine, when the current outer tube temperature of the unit is less than or equal to 0 ℃, the interval in which the absolute humidity of the current outdoor air of the unit is in the set humidity range is a third humidity interval, and the current frequency of the compressor 7 is less than or equal to the set maximum frequency, if it is determined that the current suction superheat of the compressor 7 is less than the difference between the set suction superheat and the set value, the difference between the current outdoor environment dry bulb temperature of the unit and the third set temperature is recorded as a third temperature threshold; and determining whether the current suction temperature of said compressor 7 is less than or equal to a third temperature threshold; wherein, The third set temperature is less than the second set temperature. The specific function and processing of the control unit 204 is also referred to in step S650. Wherein the third set temperature is temperature C min A third temperature threshold, e.g. dry bulb temperature T d Temperature C min 。
The control unit 204 is specifically further configured to control the unit to enter a preset defrosting mode if it is determined that the current suction air temperature of the compressor 7 is less than or equal to a third temperature threshold value when the current external pipe temperature of the unit is less than or equal to 0 ℃, the interval in which the current outdoor air absolute humidity of the unit is in the set humidity range is a third humidity interval, the current frequency of the compressor 7 is less than or equal to the set maximum frequency, and the current suction air superheat of the compressor 7 is less than the difference between the set suction air superheat and the set value. The specific function and processing of the control unit 204 also refer to step S660.
The control unit 204 is specifically further configured to, in a case where the current outer tube temperature of the unit is less than or equal to 0 ℃, the interval in which the current outdoor air absolute humidity of the unit is in the set humidity range is a third humidity interval, the current frequency of the compressor 7 is less than or equal to the set maximum frequency, and the current suction superheat of the compressor 7 is less than the difference between the set suction superheat and the set value, return to re-determine whether the current suction temperature of the compressor 7 is less than or equal to the third temperature threshold if it is determined that the current suction temperature of the compressor 7 is greater than the third temperature threshold. The specific function and processing of the control unit 204 also refer to step S670.
Specifically, as shown in fig. 10, the intelligent defrosting control method under the heating working condition of the household water machine or the air source heat pump and other units further comprises the following steps:
step 101, judging that F of the compressor 7 is more than or equal to F of frequency max Whether or not the relation of (2) holds: if F of compressor 7 is greater than or equal to frequency F max If the relation of (2) is established, the frequency F of the compressor 7 is reduced to f=f max And performs step 102; if F of compressor 7 is greater than or equal to frequency F max If the relation of (2) is not established, step 102 is directly performed. Wherein the frequency isRate F max In order to ensure that the unit can run for a long time in a high humidity state and is not easy to frost, the values of different units are different, and the frequency F can be tentatively set according to experimental data max Is 60Hz.
Step 102, reading the suction superheat a of the compressor 7 after the unit is stabilized, and then executing step 103.
Step 103, judging whether a relation formula of suction superheat degree a of the compressor 7 is more than or equal to A-1 is established: if the relationship that the suction superheat a of the compressor 7 is equal to or greater than A-1 is established, the opening degree K=K+K of the electronic expansion valve 8 is increased i And returning to the logic of step 102 for reading the suction superheat a of the compressor 7 after the unit is stabilized; if the relationship that the suction superheat a of the compressor 7 is equal to or greater than A-1 is not established, step 104 is executed.
Step 104, reading the suction temperature T of the compressor 7 corresponding to the low pressure sensor 15 l Step 105 is then performed.
Step 105, judging suction temperature T of compressor 7 l The dry bulb temperature T is less than or equal to d Temperature C min Whether or not the relation of (2) holds: if the suction temperature T of the compressor 7 l The dry bulb temperature T is less than or equal to d Temperature C min If the relation of (2) is not satisfied, the process returns to step 104 to read the suction temperature T corresponding to the low pressure sensor l Logic in (2); if the suction temperature T of the compressor 7 l The dry bulb temperature T is less than or equal to d Temperature C min If the relation of (2) is established, the unit enters a defrosting mode, and then step 106 is executed to read the fin temperature T of the outdoor heat exchanger 5 c 。
Wherein the temperature C min When the unit can enter a defrosting mode when the absolute moisture content of the outdoor air is high, the outdoor environment temperature and the suction temperature T of the compressor 7 are indicated l The difference between different units and the value of different refrigerants will be different, and the scheme of the invention can temporarily control the temperature C min The value was 8 ℃.
The scheme of the invention provides the method for controlling the dry bulb temperature T of the outdoor environment according to the absolute moisture content d of the outdoor air d And suction temperature T of compressor 7 l The difference is gradedThe adjusting scheme is used for accurately predicting the frosting state of the unit, and adopting different measures aiming at different moisture contents to reduce the frosting speed of the unit and lengthen the frosting period. In the scheme of the invention, the possibility of frosting of the unit is identified according to the absolute moisture content d of the outdoor air, and measures for increasing the opening degree of the electronic expansion valve 8 are adopted at medium humidity, and the measures for limiting the frequency of the compressor and increasing the opening degree of the electronic expansion valve 8 are cooperatively adopted at high humidity so as to prolong the frosting period of the unit.
In the scheme of the invention, the unit states are divided into three types of difficult frosting, easier frosting and very easy frosting according to the absolute moisture content d of outdoor air, and different frosting judgment conditions and frosting prevention measures are adopted in different unit states, so that the frosting logic and frosting prevention control are more targeted, the situation that the unit is cooled and heated to counteract and reduce the comprehensive energy efficiency of the unit due to the fact that frosting is less on fins or the unit enters a frosting mode can be prevented, and the comprehensive energy efficiency of the unit is improved.
In some embodiments, the control unit 204, after the unit enters the preset defrosting mode, controls the unit to exit the preset defrosting mode according to the current external pipe temperature of the unit, so as to realize defrosting control of the unit, and includes:
the control unit 204 is specifically further configured to determine, after the unit enters a preset defrosting mode, whether the current outer tube temperature of the unit is greater than or equal to a fourth set temperature; wherein the fourth set temperature is greater than 0. The specific function and process of the control unit 204 also refer to step S710. Wherein the third set temperature is temperature B.
The control unit 204 is specifically further configured to control the unit to exit from the preset defrosting mode to implement defrosting control of the unit if it is determined that the current outer tube temperature of the unit is greater than or equal to the fourth set temperature after the unit enters the preset defrosting mode. The specific function and processing of the control unit 204 is also referred to step S720.
The control unit 204 is specifically further configured to, after the unit enters the preset defrosting mode, return if it is determined that the current outer tube temperature of the unit is less than the fourth set temperature, so as to re-determine whether the current outer tube temperature of the unit is greater than or equal to the fourth set temperature. The specific function and process of the control unit 204 also refer to step S730.
Specifically, in the case that the interval where the absolute humidity of the current outdoor air of the unit is in the set humidity range is the first humidity interval, after the unit enters the preset defrosting mode, as shown in fig. 10, the intelligent defrosting control method under the heating condition of the unit such as the household water machine or the air source heat pump further includes: step 84, reading the fin temperature T of the outdoor heat exchanger 5 c Step 85 is then performed. Step 85, judging the fin temperature T of the outdoor heat exchanger 5 c Whether or not the relation of the temperature B is satisfied: if yes, the unit exits the defrosting mode and returns to the step 6, otherwise, the unit returns to the step 84. The value of the temperature B is required to be larger than 0, but in order to ensure defrosting cleanliness, the value of the temperature B can be about 10 ℃. If the fin temperature T of the outdoor heat exchanger 5 c If the relation of the temperature B is not satisfied, the temperature T of the fins of the outdoor heat exchanger 5 is read back c Logic in (2); if the fin temperature T of the outdoor heat exchanger 5 c T is greater than or equal to temperature B c If the temperature B is not less than the preset value, the unit can exit the defrosting mode and return to the step 6 to read the dry ball temperature T corresponding to the dry ball pressure sensor 16 d And wet bulb temperature T w Logic of (3).
When the interval where the absolute humidity of the current outdoor air of the unit is in the set humidity range is the first humidity interval, after the unit enters the preset defrosting mode, as shown in fig. 10, the intelligent defrosting control method under the heating working condition of the unit such as the household water machine or the air source heat pump further comprises: step 98, reading the fin temperature T of the outdoor heat exchanger 5 c And determines the fin temperature T of the outdoor heat exchanger 5 c Whether or not the relation of the temperature B is satisfied: if the fin temperature T of the outdoor heat exchanger 5 c If the relation of the temperature B is not satisfied, returning to the step 98 to read the fin temperature T c Logic in (2); if the fin temperature T of the outdoor heat exchanger 5 c If the relation of the temperature B is not less than, the unit can exit the defrosting mode, and return to the step 6 to read the dry ball temperature T corresponding to the dry ball pressure sensor 16 d And wet bulb temperature T w Logic of (3).
When the interval where the absolute humidity of the current outdoor air of the unit is in the set humidity range is the first humidity interval, after the unit enters the preset defrosting mode, as shown in fig. 10, the intelligent defrosting control method under the heating working condition of the unit such as the household water machine or the air source heat pump further comprises: step 106, reading the fin temperature T of the outdoor heat exchanger 5 c And judges the T of the outdoor heat exchanger 5 c Whether or not the relation of the temperature B is satisfied: if T of the outdoor heat exchanger 5 c If the relation of the temperature B is not satisfied, returning to the step 106 to read the fin temperature T c Logic in (2); if T of the outdoor heat exchanger 5 c If the relation of the temperature B is not less than, the unit can exit the defrosting mode, and return to the step 6 to read the dry ball temperature T corresponding to the dry ball pressure sensor 16 d And wet bulb temperature T w Logic of (3).
According to the scheme, defrosting is not regulated by time, defrosting difficulty is graded according to the absolute moisture content of outdoor air, whether a unit enters defrosting is judged by the difference between the dry bulb temperature of an outdoor environment and the suction temperature of the compressor 7, and the frosting state of the unit can be more intelligently identified by different measures of preventing frosting (such as increasing the opening degree of the electronic expansion valve 8, limiting frequency and the like) of different moisture contents and different frosting entering conditions; and judging whether to defrost according to the air suction temperature of the compressor 7 and the opening of the electronic expansion valve 8, so that the method is suitable for defrosting in areas with different climates and can avoid the occurrence of false defrosting. The defrosting control strategy provided by the scheme of the invention can avoid the problems of mistaken defrosting and incomplete defrosting in a high-humidity area, saves energy and improves the heating effect.
Since the processes and functions implemented by the apparatus of the present embodiment substantially correspond to the embodiments, principles and examples of the foregoing methods, the descriptions of the embodiments are not exhaustive, and reference may be made to the descriptions of the foregoing embodiments and their descriptions are omitted herein.
By adopting the technical scheme of the invention, after the water inlet temperature of the unit such as the household water machine or the air source heat pump meets the starting condition of the unit, the unit is controlled to start and operate; under the condition that the fin temperature of the outdoor heat exchanger 5 is smaller than or equal to 0, determining the absolute moisture content of outdoor air according to the dry bulb temperature and the wet bulb temperature at the outdoor heat exchanger 5, and determining the time when a unit enters a defrosting mode and exits the defrosting mode in a grading manner according to the section where the absolute moisture content of the outdoor air is in a set moisture content range and by combining the corresponding parameters in the air suction temperature of the compressor 7, the fin temperature of the outdoor heat exchanger 5, the air suction superheat degree of the compressor 7 and the frequency of the compressor 7, so that different defrosting judging conditions and anti-frosting measures are adopted in different unit states, and accurate frosting is realized; therefore, defrosting logic and anti-frosting control are more targeted, the situation that the unit is balanced out by cold and heat due to the fact that frost is not formed on the fins or the frost is formed on the fins is little and the unit enters a defrosting mode to reduce the comprehensive energy efficiency of the unit can be prevented, and the comprehensive energy efficiency of the unit is improved.
According to an embodiment of the present invention, there is also provided a unit corresponding to the defrosting control device of the unit. The unit may include: the defrosting control device of the unit.
Since the processing and functions implemented by the unit of this embodiment basically correspond to the embodiments, principles and examples of the foregoing apparatus, the description of this embodiment is not exhaustive, and reference may be made to the related descriptions in the foregoing embodiments, which are not repeated herein.
By adopting the technical scheme of the invention, after the water inlet temperature of the unit such as the household water machine or the air source heat pump meets the starting condition of the unit, the unit is controlled to start and operate; under the condition that the fin temperature of the outdoor heat exchanger 5 is smaller than or equal to 0, determining the absolute moisture content of outdoor air according to the dry bulb temperature and the wet bulb temperature at the outdoor heat exchanger 5, and determining the time when a unit enters a defrosting mode and exits the defrosting mode in a grading manner according to the section where the absolute moisture content of the outdoor air is in a set moisture content range and by combining the corresponding parameters in the air suction temperature of the compressor 7, the fin temperature of the outdoor heat exchanger 5, the air suction superheat degree of the compressor 7 and the frequency of the compressor 7, so that different defrosting judging conditions and anti-frosting measures are adopted in different unit states, and accurate frosting is realized; therefore, the frosting state of the unit can be estimated more accurately, the unit intelligently enters a defrosting mode, the phenomena of defrosting in advance and defrosting out delay are prevented, and the comprehensive energy efficiency of the unit is improved.
According to an embodiment of the present invention, there is also provided a storage medium corresponding to a defrosting control method of a unit, the storage medium including a stored program, wherein the device in which the storage medium is controlled to execute the above defrosting control method of a unit when the program runs.
Since the processes and functions implemented by the storage medium of the present embodiment substantially correspond to the embodiments, principles and examples of the foregoing methods, the descriptions of the present embodiment are not exhaustive, and reference may be made to the related descriptions of the foregoing embodiments, which are not repeated herein.
By adopting the technical scheme of the invention, after the water inlet temperature of the unit such as the household water machine or the air source heat pump meets the starting condition of the unit, the unit is controlled to start and operate; under the condition that the fin temperature of the outdoor heat exchanger 5 is smaller than or equal to 0, determining the absolute moisture content of outdoor air according to the dry bulb temperature and the wet bulb temperature at the outdoor heat exchanger 5, and determining the time when a unit enters a defrosting mode and exits the defrosting mode in a grading manner according to the section where the absolute moisture content of the outdoor air is in a set moisture content range and by combining the corresponding parameters in the air suction temperature of the compressor 7, the fin temperature of the outdoor heat exchanger 5, the air suction superheat degree of the compressor 7 and the frequency of the compressor 7, so that different defrosting judging conditions and anti-frosting measures are adopted in different unit states, and accurate frosting is realized; therefore, the frosting state of the unit can be more accurately identified, the unit is prevented from being frequently switched to a frosting mode when frosting is less, unnecessary frosting operation is reduced, and the energy consumption of the unit is effectively saved.
In summary, it is readily understood by those skilled in the art that the above-described advantageous ways can be freely combined and superimposed without conflict.
The above description is only an example of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims (8)

1. The defrosting control method of the unit is characterized in that the unit is provided with an outdoor unit and an indoor unit; the outdoor unit includes: a compressor (7), an outdoor heat exchanger (5) and an electronic expansion valve (8); the indoor unit includes: an indoor heat exchanger (3); the indoor heat exchanger (3) is provided with a water side heat exchange pipeline and a refrigerant side heat exchange pipeline; an exhaust port of the compressor (7) returns to an air suction port of the compressor (7) after passing through the outdoor heat exchanger (5), the electronic expansion valve (8) and a refrigerant side heat exchange pipeline of the indoor heat exchanger (3); the defrosting control method of the unit comprises the following steps:
under the condition that a starting-up instruction of the unit is received, acquiring the temperature of a pipeline where a water inlet of a water side heat exchange pipeline of the indoor heat exchanger (3) is positioned, and recording the temperature as the current water inlet temperature of the unit;
Controlling the machine set to start and run under the condition that the current water inlet temperature of the machine set is in the set water inlet temperature range;
under the condition that the unit operates, acquiring the fin temperature of the outdoor heat exchanger (5), and recording the fin temperature as the current outer tube temperature of the unit; acquiring the temperature of a pipeline where an air suction port of the compressor (7) is positioned, and recording the temperature as the current suction temperature of the compressor (7); acquiring the dry bulb temperature and the wet bulb temperature of the outdoor heat exchanger (5), and recording the dry bulb temperature and the wet bulb temperature as the current outdoor environment dry bulb temperature of the unit and the current outdoor environment wet bulb temperature of the unit; acquiring a current suction superheat of the compressor (7); -obtaining a current frequency of the compressor (7); the current opening degree of the electronic expansion valve (8) is obtained;
when the current outer tube temperature of the unit is less than or equal to 0 ℃, controlling the unit to enter and exit a preset defrosting mode by combining the current outdoor environment dry bulb temperature of the unit, the current outdoor environment wet bulb temperature of the unit, the current suction temperature of the compressor (7), the current suction superheat degree of the compressor (7), the current frequency of the compressor (7), the current opening of the electronic expansion valve (8) and the current outer tube temperature of the unit so as to realize defrosting control of the unit;
Wherein, combine the current outdoor environment dry bulb temperature of unit, the current outdoor environment wet bulb temperature of unit, the current suction temperature of compressor (7), the current suction superheat degree of compressor (7), the current frequency of compressor (7), the current aperture of electronic expansion valve (8), and the current outer tube temperature of unit, control the unit business turn over and predetermine defrosting mode to realize the defrosting control to the unit, include:
determining the absolute moisture content of the current outdoor air of the unit according to the current outdoor environment dry bulb temperature of the unit and the current outdoor environment wet bulb temperature of the unit;
according to the interval where the absolute moisture content of the current outdoor air of the unit is in the set moisture content range, the unit is controlled to enter a preset defrosting mode by combining the current outdoor environment dry bulb temperature of the unit, the current outdoor environment wet bulb temperature of the unit, the current air suction temperature of the compressor (7), the current air suction superheat degree of the compressor (7), the current frequency of the compressor (7) and the current opening of the electronic expansion valve (8);
After the unit enters a preset defrosting mode, controlling the unit to exit the preset defrosting mode according to the current outer pipe temperature of the unit so as to realize defrosting control of the unit;
wherein, set up the moisture content range, include: an outdoor air moisture content range divided by the first set moisture content and the second set moisture content; the section of the unit, in which the absolute moisture content of the current outdoor air is smaller than or equal to the first set moisture content, is a first humidity section, the section of the unit, in which the absolute moisture content of the current outdoor air is larger than the first set moisture content and smaller than or equal to the second set moisture content, is a second humidity section, and the section of the unit, in which the absolute moisture content of the current outdoor air is larger than the second set moisture content, is a third humidity section; the first set moisture content refers to the absolute moisture content of outdoor air when the unit is not easy to frost; the second set moisture content refers to the absolute moisture content of the outdoor air when the unit is relatively easy to frost;
according to the interval where the absolute moisture content of the current outdoor air of the unit is in the set moisture content range, and in combination with the current outdoor environment dry bulb temperature of the unit, the current outdoor environment wet bulb temperature of the unit, the current suction temperature of the compressor (7), the current suction superheat degree of the compressor (7), the current frequency of the compressor (7) and the current opening of the electronic expansion valve (8), controlling the unit to enter a preset defrosting mode, the method comprises the following steps:
Determining a section where the absolute moisture content of the current outdoor air of the unit is in a set moisture content range;
if the section where the absolute moisture content of the current outdoor air of the unit is in the set moisture content range is determined to be a first humidity section, controlling the unit to enter a preset defrosting mode according to the current air suction temperature of the compressor (7) and the current outdoor environment dry bulb temperature of the unit;
if the section where the absolute moisture content of the current outdoor air of the unit is in the set moisture content range is determined to be a second moisture section, controlling the unit to enter a preset defrosting mode according to the current suction superheat degree of the compressor (7), the current opening degree of the electronic expansion valve (8), the current suction temperature of the compressor (7) and the current outdoor environment dry bulb temperature of the unit;
and if the section where the absolute moisture content of the current outdoor air of the unit is in the set moisture content range is determined to be a third moisture section, controlling the unit to enter a preset defrosting mode according to the current frequency of the compressor (7), the current suction superheat degree of the compressor (7), the current opening degree of the electronic expansion valve (8), the current suction temperature of the compressor (7) and the current outdoor environment dry bulb temperature of the unit.
2. A defrosting control method of a unit according to claim 1, characterized in that controlling the unit to enter a preset defrosting mode according to the current suction temperature of the compressor (7) and the current outdoor environment dry bulb temperature of the unit comprises:
determining a difference value between the current outdoor environment dry bulb temperature of the unit and a first set temperature, and recording the difference value as a first temperature threshold;
determining whether the current suction temperature of the compressor (7) is less than or equal to a first temperature threshold;
if the current suction temperature of the compressor (7) is less than or equal to a first temperature threshold value, controlling the unit to enter a preset defrosting mode;
if it is determined that the current suction temperature of the compressor (7) is greater than a first temperature threshold, returning to re-determine whether the current suction temperature of the compressor (7) is less than or equal to the first temperature threshold.
3. The defrosting control method of a unit according to claim 1, characterized in that controlling the unit to enter a preset defrosting mode according to a current suction superheat degree of the compressor (7), a current opening degree of the electronic expansion valve (8), a current suction temperature of the compressor (7), and a current outdoor environment dry bulb temperature of the unit, comprises:
Determining whether the current suction superheat degree of the compressor (7) is greater than or equal to the difference value between the set suction superheat degree and the set value;
if the current air suction superheat degree of the compressor (7) is determined to be greater than or equal to the difference value between the set air suction superheat degree and the set value, controlling the current opening degree of the electronic expansion valve (8) to be increased by the set opening degree to obtain a new current opening degree of the electronic expansion valve (8), and returning to determine whether the current air suction superheat degree of the compressor (7) is greater than or equal to the difference value between the set air suction superheat degree and the set value;
if the current suction superheat degree of the compressor (7) is smaller than the difference value between the set suction superheat degree and the set value, determining the difference value between the current outdoor environment dry bulb temperature of the unit and the second set temperature, and recording the difference value as a second temperature threshold; and determining whether the current suction temperature of the compressor (7) is less than or equal to a second temperature threshold; wherein the second set temperature is less than the first set temperature;
if the current suction temperature of the compressor (7) is less than or equal to a second temperature threshold value, controlling the unit to enter a preset defrosting mode;
if it is determined that the current suction temperature of the compressor (7) is greater than a second temperature threshold, returning to re-determine whether the current suction temperature of the compressor (7) is less than or equal to the second temperature threshold.
4. The defrosting control method of a unit according to claim 1, characterized in that controlling the unit to enter a preset defrosting mode according to a current frequency of the compressor (7), a current suction superheat degree of the compressor (7), a current opening degree of the electronic expansion valve (8), a current suction temperature of the compressor (7), and a current outdoor environment dry bulb temperature of the unit, comprises:
determining whether the current frequency of the compressor (7) is greater than or equal to a set maximum frequency;
if the current frequency of the compressor (7) is determined to be greater than or equal to the set maximum frequency, reducing the current frequency of the compressor (7) to the set maximum frequency to obtain a new current frequency of the compressor (7), and then determining whether the current suction superheat degree of the compressor (7) is greater than or equal to a difference value between the set suction superheat degree and the set value;
if the current frequency of the compressor (7) is determined to be smaller than the set maximum frequency, determining whether the current suction superheat of the compressor (7) is larger than or equal to the difference value between the set suction superheat and the set value;
if the current air suction superheat degree of the compressor (7) is determined to be greater than or equal to the difference value between the set air suction superheat degree and the set value, controlling the current opening degree of the electronic expansion valve (8) to be increased by the set opening degree to obtain a new current opening degree of the electronic expansion valve (8), and returning to determine whether the current air suction superheat degree of the compressor (7) is greater than or equal to the difference value between the set air suction superheat degree and the set value;
If the current suction superheat degree of the compressor (7) is smaller than the difference value between the set suction superheat degree and the set value, determining the difference value between the current outdoor environment dry bulb temperature of the unit and the third set temperature, and recording the difference value as a third temperature threshold; and determining whether the current suction temperature of the compressor (7) is less than or equal to a third temperature threshold; wherein the third set temperature is less than the second set temperature;
if the current suction temperature of the compressor (7) is less than or equal to a third temperature threshold value, controlling the unit to enter a preset defrosting mode;
if it is determined that the current suction temperature of the compressor (7) is greater than a third temperature threshold, returning to re-determine whether the current suction temperature of the compressor (7) is less than or equal to the third temperature threshold.
5. The defrosting control method of a unit according to any one of claims 1 to 4, wherein after the unit enters a preset defrosting mode, the unit is controlled to exit the preset defrosting mode according to the current outer tube temperature of the unit so as to realize defrosting control of the unit, comprising:
after the unit enters a preset defrosting mode, determining whether the current outer tube temperature of the unit is greater than or equal to a fourth set temperature; wherein the fourth set temperature is greater than 0;
If the current outer tube temperature of the unit is determined to be greater than or equal to the fourth set temperature, controlling the unit to exit from a preset defrosting mode so as to realize defrosting control of the unit;
and if the current outer tube temperature of the unit is determined to be smaller than the fourth set temperature, returning to determine whether the current outer tube temperature of the unit is greater than or equal to the fourth set temperature again.
6. The defrosting control device of the unit is characterized in that the unit is provided with an outdoor unit and an indoor unit; the outdoor unit includes: a compressor (7), an outdoor heat exchanger (5) and an electronic expansion valve (8); the indoor unit includes: an indoor heat exchanger (3); the indoor heat exchanger (3) is provided with a water side heat exchange pipeline and a refrigerant side heat exchange pipeline; an exhaust port of the compressor (7) returns to an air suction port of the compressor (7) after passing through the outdoor heat exchanger (5), the electronic expansion valve (8) and a refrigerant side heat exchange pipeline of the indoor heat exchanger (3); defrosting control device of unit includes:
the acquisition unit is configured to acquire the temperature of a pipeline where a water inlet of the water side heat exchange pipeline of the indoor heat exchanger (3) is positioned under the condition that a starting-up instruction of the unit is received, and the temperature is recorded as the current water inlet temperature of the unit;
The control unit is configured to control the unit to start and run under the condition that the current water inlet temperature of the unit is within a set water inlet temperature range;
the acquisition unit is further configured to acquire a fin temperature of the outdoor heat exchanger (5) as a current outer tube temperature of the unit under the condition that the unit is operated; acquiring the temperature of a pipeline where an air suction port of the compressor (7) is positioned, and recording the temperature as the current suction temperature of the compressor (7); acquiring the dry bulb temperature and the wet bulb temperature of the outdoor heat exchanger (5), and recording the dry bulb temperature and the wet bulb temperature as the current outdoor environment dry bulb temperature of the unit and the current outdoor environment wet bulb temperature of the unit; acquiring a current suction superheat of the compressor (7); -obtaining a current frequency of the compressor (7); the current opening degree of the electronic expansion valve (8) is obtained;
the control unit is further configured to control the unit to enter and exit a preset defrosting mode under the condition that the current outer tube temperature of the unit is less than or equal to 0 ℃, in combination with the current outdoor environment dry bulb temperature of the unit, the current outdoor environment wet bulb temperature of the unit, the current air suction temperature of the compressor (7), the current air suction superheat degree of the compressor (7), the current frequency of the compressor (7), the current opening of the electronic expansion valve (8) and the current outer tube temperature of the unit, so as to realize defrosting control of the unit;
The control unit, in combination with a current outdoor environment dry bulb temperature of the unit, a current outdoor environment wet bulb temperature of the unit, a current suction temperature of the compressor (7), a current suction superheat degree of the compressor (7), a current frequency of the compressor (7), a current opening degree of the electronic expansion valve (8), and a current outer tube temperature of the unit, controls the unit to enter and exit a preset defrosting mode so as to realize defrosting control of the unit, comprises:
determining the absolute moisture content of the current outdoor air of the unit according to the current outdoor environment dry bulb temperature of the unit and the current outdoor environment wet bulb temperature of the unit;
according to the interval where the absolute moisture content of the current outdoor air of the unit is in the set moisture content range, the unit is controlled to enter a preset defrosting mode by combining the current outdoor environment dry bulb temperature of the unit, the current outdoor environment wet bulb temperature of the unit, the current air suction temperature of the compressor (7), the current air suction superheat degree of the compressor (7), the current frequency of the compressor (7) and the current opening of the electronic expansion valve (8);
After the unit enters a preset defrosting mode, controlling the unit to exit the preset defrosting mode according to the current outer pipe temperature of the unit so as to realize defrosting control of the unit;
wherein, set up the moisture content range, include: an outdoor air moisture content range divided by the first set moisture content and the second set moisture content; the section of the unit, in which the absolute moisture content of the current outdoor air is smaller than or equal to the first set moisture content, is a first humidity section, the section of the unit, in which the absolute moisture content of the current outdoor air is larger than the first set moisture content and smaller than or equal to the second set moisture content, is a second humidity section, and the section of the unit, in which the absolute moisture content of the current outdoor air is larger than the second set moisture content, is a third humidity section; the first set moisture content refers to the absolute moisture content of outdoor air when the unit is not easy to frost; the second set moisture content refers to the absolute moisture content of the outdoor air when the unit is relatively easy to frost;
the control unit, according to the interval where the absolute moisture content of the current outdoor air of the unit is in the set moisture content range, combines the current outdoor environment dry bulb temperature of the unit, the current outdoor environment wet bulb temperature of the unit, the current air suction temperature of the compressor (7), the current air suction superheat degree of the compressor (7), the current frequency of the compressor (7) and the current opening of the electronic expansion valve (8), controls the unit to enter a preset defrosting mode, and comprises:
Determining a section where the absolute moisture content of the current outdoor air of the unit is in a set moisture content range;
if the section where the absolute moisture content of the current outdoor air of the unit is in the set moisture content range is determined to be a first humidity section, controlling the unit to enter a preset defrosting mode according to the current air suction temperature of the compressor (7) and the current outdoor environment dry bulb temperature of the unit;
if the section where the absolute moisture content of the current outdoor air of the unit is in the set moisture content range is determined to be a second moisture section, controlling the unit to enter a preset defrosting mode according to the current suction superheat degree of the compressor (7), the current opening degree of the electronic expansion valve (8), the current suction temperature of the compressor (7) and the current outdoor environment dry bulb temperature of the unit;
and if the section where the absolute moisture content of the current outdoor air of the unit is in the set moisture content range is determined to be a third moisture section, controlling the unit to enter a preset defrosting mode according to the current frequency of the compressor (7), the current suction superheat degree of the compressor (7), the current opening degree of the electronic expansion valve (8), the current suction temperature of the compressor (7) and the current outdoor environment dry bulb temperature of the unit.
7. A unit, comprising: the defrosting control device of the unit according to claim 6.
8. A storage medium comprising a stored program, wherein the program, when run, controls a device in which the storage medium is located to perform the defrosting control method of the unit according to any one of claims 1 to 5.
CN202311804605.1A 2023-12-26 2023-12-26 Defrosting control method and device for unit, unit and storage medium Active CN117450628B (en)

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JP2007225155A (en) * 2006-02-21 2007-09-06 Mitsubishi Electric Corp Defrosting operation control device and method
JP2014081174A (en) * 2012-10-18 2014-05-08 Fujitsu General Ltd Air conditioner
CN108895608A (en) * 2018-07-25 2018-11-27 珠海格力电器股份有限公司 A kind of method and air-conditioner set of subregion control air-conditioning defrost
CN109539622A (en) * 2018-11-30 2019-03-29 上海海立睿能环境技术有限公司 A kind of net for air-source heat pump units and its defrosting control method
CN115218346A (en) * 2022-08-03 2022-10-21 珠海格力电器股份有限公司 Heat storage defrosting control method and air conditioning unit
CN115451528A (en) * 2022-09-26 2022-12-09 宁波奥克斯电气股份有限公司 Defrosting control method, control device and air conditioner heat exchange system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007225155A (en) * 2006-02-21 2007-09-06 Mitsubishi Electric Corp Defrosting operation control device and method
JP2014081174A (en) * 2012-10-18 2014-05-08 Fujitsu General Ltd Air conditioner
CN108895608A (en) * 2018-07-25 2018-11-27 珠海格力电器股份有限公司 A kind of method and air-conditioner set of subregion control air-conditioning defrost
CN109539622A (en) * 2018-11-30 2019-03-29 上海海立睿能环境技术有限公司 A kind of net for air-source heat pump units and its defrosting control method
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