CN114543282B - Air conditioner dehumidification control method and system - Google Patents

Air conditioner dehumidification control method and system Download PDF

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CN114543282B
CN114543282B CN202210157470.3A CN202210157470A CN114543282B CN 114543282 B CN114543282 B CN 114543282B CN 202210157470 A CN202210157470 A CN 202210157470A CN 114543282 B CN114543282 B CN 114543282B
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temperature
humidity
dehumidification
compressor
ambient
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CN114543282A (en
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张荣海
颜鲁华
李亚军
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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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
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
    • 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
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • 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
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • 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
    • 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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  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Signal Processing (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides an air conditioner dehumidification control method and system, when the ambient temperature is greater than or equal to a set ring temperature, the frequency of a compressor and the wind speed of an indoor fan are controlled according to the humidity difference value between the ambient humidity and the set humidity, when the ambient temperature is less than the set ring temperature, different control means are distinguished according to the current dew point temperature, when the dew point temperature is greater than or equal to a low-temperature dew point temperature threshold value, the frequency of the compressor and the wind speed of the indoor fan are controlled according to the humidity difference value between the ambient humidity and the set humidity, and when the dew point temperature is less than the low-temperature dew point temperature threshold value, intermittent dehumidification control is executed; the invention adopts the set ring temperature as a control node to distinguish normal temperature dynamic dehumidification and low temperature dynamic dehumidification, in the normal temperature dynamic dehumidification and the low temperature dynamic dehumidification, the high-efficiency dehumidification and the energy-saving dehumidification are distinguished according to the humidity difference value between the ambient humidity and the set humidity, and in the low temperature dynamic dehumidification, the dynamic dehumidification and the intermittent dehumidification are distinguished according to the dew point temperature, so that the uninterrupted dehumidification effect with both high efficiency and energy saving is achieved.

Description

Air conditioner dehumidification control method and system
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to an air conditioner dehumidification control method and system.
Background
Under the refrigeration working condition, the air conditioner can correspondingly reduce the indoor humidity based on the condensation phenomenon due to the lower evaporation temperature of the heat exchanger, so that the dehumidification effect is achieved, and the air conditioner can also design a dehumidification mode based on the refrigeration working condition to implement the dehumidification function.
According to the principle of dehumidification, effective dehumidification control can be achieved only when the condition that the evaporation temperature Tl of the heat exchanger is smaller than the dew point Td of the environment is achieved, but at present, conventional dehumidification control logic of an air conditioner is refrigeration operation, and the control can effectively dehumidify under the conditions of high temperature and high humidity, for example, the environment temperature is 26 ℃, the dew point temperature is 22.28 ℃ under the condition that the evaporation temperature Tl of the heat exchanger is easily lower than the dew point Td during refrigeration operation, but when the dew point Td is lower than 10 ℃ but the environment humidity does not reach the set humidity, the evaporation temperature Tl of the heat exchanger is not lower than the dew point Td during refrigeration operation, and therefore dehumidification effect or poor effect cannot be achieved.
Meanwhile, when dehumidification is performed under extremely low temperature and high humidity conditions, the condition that the dew point temperature Td of the environment is too low often occurs, the condition that the dew point temperature Td is lower than 3 ℃ often occurs, when the air conditioner is used for dehumidification, due to reliability control such as freezing prevention and the like of an air conditioner, a compressor is stopped, the evaporation temperature Tl of a heat exchanger is higher than the dew point temperature Td of the environment, and therefore the heat exchanger cannot be continuously dehumidified at extremely low temperature for a long time, and the dehumidification effect cannot be achieved, and energy is wasted.
Disclosure of Invention
The invention provides an air conditioner dehumidification control method and system, aiming at the technical problem that an air conditioner cannot continuously dehumidify and cannot achieve a dehumidification effect in a low-temperature high-humidity environment, wherein dynamic dehumidification control and low-temperature dynamic dehumidification control are distinguished according to the environment temperature, high-efficiency dehumidification control and energy-saving dehumidification control are distinguished according to the humidity difference value between the environment humidity and set humidity in the dynamic dehumidification control and the low-temperature dynamic dehumidification control, and the dynamic dehumidification control and intermittent dehumidification control are distinguished according to the dew point temperature in the low-temperature dynamic dehumidification control, so that the uninterrupted dehumidification effect with high efficiency and energy saving can be achieved.
The invention adopts the following technical scheme:
the air conditioner dehumidification control method comprises the following steps of:
acquiring the ambient temperature and the ambient humidity;
calculating a dew point temperature based on the ambient temperature and the ambient humidity;
when the ambient temperature is greater than or equal to the set ambient temperature, controlling the frequency of the compressor and the wind speed of the indoor fan based on the humidity difference value between the ambient humidity and the set humidity;
when the ambient temperature is smaller than the set ambient temperature, if the dew point temperature is larger than or equal to the low-temperature dew point temperature threshold value, controlling the frequency of the compressor and the wind speed of the indoor fan based on the humidity difference value of the ambient humidity and the set humidity; if the dew point temperature is less than the low temperature dew point temperature threshold, intermittent dehumidification control is performed.
An air conditioning dehumidifying system is proposed, comprising:
a compressor and an indoor fan;
the temperature sensor is arranged at the air return port of the air conditioner and used for detecting the ambient temperature;
the humidity sensor is arranged at the air return port of the air conditioner and used for detecting the ambient humidity;
the acquisition module is used for acquiring the ambient temperature and the ambient humidity;
the dew point temperature calculating module is used for calculating the dew point temperature based on the ambient temperature and the ambient humidity;
the dynamic dehumidification control module is used for controlling the frequency of the compressor and the wind speed of the indoor fan based on the humidity difference value of the ambient humidity and the set humidity when the ambient temperature is greater than or equal to the set ambient temperature;
the low-temperature dynamic dehumidification control module is used for controlling the frequency of the compressor and the wind speed of the indoor fan based on the humidity difference value of the ambient humidity and the set humidity if the dew point temperature is greater than or equal to the low-temperature dew point temperature threshold value when the ambient temperature is smaller than the set ambient temperature; if the dew point temperature is less than the low temperature dew point temperature threshold, intermittent dehumidification control is performed.
Compared with the prior art, the method has the following technical effects: according to the air conditioner dehumidification control method and system, different control means are distinguished according to the ambient temperature, when the ambient temperature is greater than or equal to the set ambient temperature, the frequency of the compressor and the wind speed of the indoor fan are controlled according to the humidity difference value of the ambient humidity and the set humidity, the effect of continuous dehumidification is achieved, when the ambient temperature is less than the set ambient temperature, different control means are further distinguished according to the current dew point temperature, when the dew point temperature is greater than or equal to the low-temperature dew point temperature threshold value, the frequency of the compressor and the wind speed of the indoor fan are controlled according to the humidity difference value of the ambient humidity and the set humidity, the effect of continuous dehumidification is achieved, when the dew point temperature is less than the low-temperature dew point temperature threshold value, intermittent dehumidification control is carried out, and on the premise of preventing system protection, dehumidification can still be avoided; the invention adopts the set ring temperature as a control node to distinguish dynamic dehumidification control and low-temperature dynamic dehumidification control, adjusts the frequency of a compressor and the wind speed of an indoor fan aiming at the dynamic dehumidification control and the low-temperature dynamic dehumidification control by adopting a humidity difference value, realizes continuous dehumidification, further executes intermittent dehumidification control by taking the dew point temperature as a control node in the low-temperature dynamic dehumidification control when the dew point temperature is extremely low, effectively prevents a heat exchanger from freezing to enter anti-freezing protection while keeping continuous dehumidification without stopping machine, realizes uninterrupted dehumidification and combines the effects of high efficiency and energy saving dehumidification, and solves the technical problem that the existing air conditioner cannot continuously dehumidify under the low-temperature high-humidity environment so as not to achieve the dehumidification effect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a control flow example of dynamic dehumidification control according to the present invention;
FIG. 2 is a comparative example of dynamic dehumidification control with conventional dehumidification control in accordance with the present disclosure;
FIG. 3 is an intermittent example of intermittent dehumidification control under low temperature dynamic dehumidification control in accordance with the present disclosure;
fig. 4 is a schematic flow chart of the dehumidification control method of the air conditioner according to the present invention;
fig. 5 is a flowchart illustrating a method for controlling dehumidification of an air conditioner according to a first embodiment of the present invention;
fig. 6 is a flowchart illustrating a dehumidifying control method for an air conditioner according to a second embodiment of the present invention;
fig. 7 is a system architecture example of an air conditioning dehumidifying system according to the present invention;
FIG. 8 is a second example of a system architecture of an air conditioning and dehumidification system according to the present disclosure;
FIG. 9 is a third exemplary system architecture of an air conditioning and dehumidification system according to the present disclosure;
FIG. 10 is a diagram illustrating a fourth exemplary system architecture of an air conditioning and dehumidification system according to the present disclosure;
fig. 11 is a fifth example of a system architecture of the air conditioning and dehumidifying system according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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 the description of the present invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, as well as, for example, fixedly coupled, detachably coupled, or integrally coupled, unless otherwise specifically indicated and defined. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art. In the description of the above embodiments, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
The invention aims at providing an uninterrupted dehumidification air conditioner control mode aiming at the working condition that the dew point temperature is too low due to low temperature and high humidity in special storage areas such as southern weather, wine cellars and the like, and realizes the dynamic dehumidification without stopping machine at normal temperature and with high efficiency and energy saving, the dynamic dehumidification without stopping machine at low temperature and with high efficiency and energy saving, and the effective dehumidification without stopping machine at extremely low temperature and extremely low moisture content.
The dehumidification control method according to the present invention will be described first.
1. Dynamic dehumidification
In the design of the invention, dynamic dehumidification is a control method for realizing the air conditioner without stopping the machine and taking high-efficiency dehumidification and energy-saving dehumidification into consideration under normal temperature working condition and low temperature working condition.
According to the principle of dehumidification, the precondition for effective dehumidification is that the evaporation temperature Tl of the indoor heat exchanger is small by the dew point temperature Td, i.e. Tl < Td.
According to the invention, the temperature sensor and the humidity sensor are arranged at the return air inlet of the air conditioner to detect the ambient temperature Ti and the ambient humidity RHI, the ambient dew point temperature Td can be calculated through the ambient temperature Ti and the ambient humidity RHI, and the evaporation temperature Tl of the indoor heat exchanger is dynamically regulated by adjusting the compressor frequency Fi of the air conditioner and the wind speed F of the indoor fan, so that the evaporation temperature Tl is lower than the dew point temperature Td to achieve the uninterrupted dehumidification effect.
In the invention, as shown in fig. 1, the frequency Fi of the compressor and the wind speed F of the indoor fan are further controlled according to the humidity difference delta RH between the set humidity RHs and the ambient humidity RHI set by a user, and when the humidity difference delta RH is large, the dehumidification speed and the effect are improved by the frequency up-conversion of the compressor and the high-speed operation of the indoor fan, so that the efficient dehumidification is realized; when the humidity difference delta RH is smaller, energy-saving dehumidification is realized through frequency down-conversion of the compressor and low-speed operation of the indoor fan; when the humidity difference Δrh is zero, the dehumidification control is stopped.
In the dehumidification mode operation of the air conditioner, the ambient temperature and the ambient humidity are repeatedly acquired according to a set time interval or other condition limits, and the control is performed to achieve a dynamic dehumidification regulation.
As shown in fig. 2, the dynamic dehumidification is capable of achieving rapid and efficient dehumidification while saving about 55% of energy, compared to the conventional dehumidification control, wherein the control humidity is a switching point between efficient dehumidification and energy-saving dehumidification.
2. Dynamic dehumidification at low temperature
Under the working conditions that the ambient temperature Ti and the ambient humidity RHI are high, the ambient dew point temperature Td is high, the dehumidification purpose can be realized by the ordinary refrigeration operation, for example, under the working conditions that the ambient temperature is 26 ℃ and the ambient humidity is 80%, the dew point temperature is 22.28 ℃, and the dehumidification effect can be realized by the evaporators of the ordinary refrigeration operation, which are lower than 22.28 ℃.
Under the working conditions that the ambient temperature Ti is low and the ambient humidity RHI is high, the ambient dew point Td is low, if the evaporating temperature Tl of the indoor heat exchanger cannot be lower than the dew point Td, the ordinary refrigerating operation cannot achieve the dehumidification effect, for example, under the working conditions that the ambient temperature is 10 ℃ and the ambient humidity is 70%, the dew point temperature is 4.8 ℃, the evaporator temperature of the ordinary refrigerating operation is difficult to be lower than 4.8 ℃ and cannot achieve the dehumidification effect, and when the evaporating temperature is too low, the heat exchanger is frozen, and the system is stopped because of the freezing prevention protection.
In the invention, normal-temperature dynamic dehumidification and low-temperature dynamic dehumidification are distinguished according to the ambient temperature Ti, in the low-temperature dynamic dehumidification, a low-temperature dew point temperature threshold Tt is further set according to a dew point temperature distinguishing control means, when the dew point temperature Td is more than or equal to the low-temperature dew point temperature threshold Tt, namely Td is more than or equal to Tt, the frequency Fi of a compressor and the wind speed F of an indoor fan are controlled according to a humidity difference delta RH between set humidity RHs set by a user and ambient humidity RHI, and when the humidity difference delta RH is larger, the dehumidification speed and effect are improved through the frequency rising of the compressor and the high-speed operation of the indoor fan, so that the efficient dehumidification is realized; when the humidity difference delta RH is smaller, energy-saving dehumidification is realized through frequency down-conversion of the compressor and low-speed operation of the indoor fan; stopping the dehumidification control when the humidity difference Δrh is zero; when the dew point temperature Td is lower than the low temperature dew point temperature threshold Tt, that is, td < Tt, intermittent dehumidification control is performed, continuous dehumidification is maintained in an intermittent dehumidification manner, and the indoor heat exchanger is maintained not to enter anti-freezing protection and stop.
Unlike the normal temperature dynamic dehumidification control given in 1, the target evaporation temperature of the indoor heat exchanger under the low temperature dynamic dehumidification condition is different from the target evaporation temperature of the indoor heat exchanger under the normal temperature dynamic dehumidification condition in terms of compressor frequency Fi control and air speed F control of the indoor fan.
3. Intermittent dehumidification
As shown in fig. 3, the target evaporating temperature of the indoor heat exchanger is lower than the dew point temperature, the first set time t1 is repeatedly operated in a mode of increasing the frequency of the compressor and running the indoor fan at a low wind speed, and then the second set time t2 is stopped, so that uninterrupted dehumidification is achieved, and the indoor heat exchanger is prevented from being stopped due to the fact that the indoor heat exchanger enters anti-freezing protection.
In combination with the above control, as shown in fig. 4, the method for controlling dehumidification of an air conditioner according to the present invention includes the following steps that are circularly executed:
step S41: the ambient temperature and the ambient humidity are acquired, and the dew point temperature is calculated based on the ambient temperature and the ambient humidity.
The temperature sensor and the humidity sensor are used for acquiring the ambient temperature Ti and the ambient humidity RHI, and the current dew point temperature Td is obtained according to the acquired Ti and RHI in a table look-up mode, a formula calculation mode and the like.
Step S42: when the ambient temperature is greater than or equal to the set ambient temperature, controlling the frequency of the compressor and the wind speed of the indoor fan based on the humidity difference value between the ambient humidity and the set humidity.
Taking 18 ℃ as a set ring temperature, namely taking 18 ℃ as a ring temperature node, when the ambient temperature Ti is greater than or equal to 18 ℃, executing normal-temperature dynamic dehumidification control, and dynamically adjusting the frequency Fi of the compressor and the wind speed F of the indoor fan based on a humidity difference delta RH between the ambient humidity RHI and the set humidity RHs.
Specifically, the humidity difference Δrh is different, and the frequency Fi of the compressor and the wind speed F of the indoor fan are also different, so that the fundamental control means is that the target evaporation temperature Tlf of the indoor heat exchanger is given, and the target evaporation temperature Tlf of the indoor heat exchanger is achieved by adjusting the frequency Fi of the compressor and the wind speed F of the indoor fan.
Typically, the target evaporation temperature Tlf is lower than the dew point temperature Td to achieve uninterrupted dehumidification, i.e., the target evaporation temperature Tlf may be a dynamically adjusted value that varies with the change in dew point temperature or a set value.
Particularly, under the working condition of larger humidity difference delta RH, the target evaporation temperature Tlf can be controlled by the frequency rising of the compressor and the high wind speed running of the indoor fan to be far lower than the dew point temperature Td, so that the efficient dehumidification can be realized; under the working condition that the humidity difference delta RH is smaller, the target evaporation temperature Tlf can be controlled through the frequency reduction of the compressor and the low wind speed operation of the indoor fan, so that the target evaporation temperature is slightly lower than the dew point temperature Td, and uninterrupted and energy-saving dehumidification can be realized.
Step S43: when the ambient temperature is less than the set loop temperature, the dew point temperature is compared to a low temperature dew point temperature threshold.
When the ambient temperature Ti is less than the set ring temperature of 18 ℃, the low-temperature dynamic dehumidification control is executed, and the low-temperature dew point temperature threshold Td0 is further taken as a node in the low-temperature dynamic dehumidification control, so that uninterrupted low-temperature dynamic dehumidification control and intermittent dehumidification control are distinguished.
Step S44: when the dew point temperature is greater than or equal to the low-temperature dew point temperature threshold value, controlling the frequency of the compressor and the wind speed of the indoor fan based on the humidity difference value between the ambient humidity and the set humidity.
The control of low-temperature dynamic dehumidification is basically the same as the control of normal-temperature dynamic dehumidification, and the difference is that the target evaporation temperature of the indoor heat exchanger under the low-temperature dynamic dehumidification working condition is different from the target evaporation temperature of the indoor heat exchanger under the normal-temperature dynamic dehumidification working condition in the control of the compressor frequency Fi and the control of the wind speed F of the indoor fan.
Step S45: when the dew point temperature is less than the low temperature dew point temperature threshold, intermittent dehumidification control is performed.
Taking the low-temperature dew point temperature threshold value as 3 ℃ as an example, when the dew point temperature is very low, the ambient temperature Ti is very low, the ambient humidity RHI is high at the moment, if the air conditioner continuously operates for dehumidification, the frosting phenomenon can occur when the evaporation temperature of the indoor heat exchanger is close to 0 ℃, the system can stop to enter an anti-freezing protection state, the indoor evaporator cannot be ensured to continuously operate at the very low temperature, the evaporation temperature of the indoor heat exchanger is higher than the dew point temperature, and the dehumidification effect cannot be achieved.
The invention realizes uninterrupted dehumidification by keeping the dynamic adjustment of the air conditioner under normal temperature working condition or low temperature working condition, and is especially suitable for working conditions requiring low temperature and low humidity environment such as southern return to the south, basement, cellar, storage room and the like.
The method for dehumidifying an air conditioner according to the present invention will be described in detail with several specific embodiments.
Example 1
In this embodiment, given that the set ring temperature is 18 ℃, the low-temperature dew point temperature threshold is 3 ℃, the first humidity difference node for distinguishing efficient dehumidification and energy-saving dehumidification is 10%, the first evaporation temperature Tl1 is the target evaporation temperature of the indoor heat exchanger during efficient dehumidification, and the second evaporation temperature Tl2 is the target evaporation temperature of the indoor heat exchanger during energy-saving dehumidification.
As shown in fig. 5, the method for controlling dehumidification of an air conditioner according to the present embodiment includes:
step S51: the ambient temperature and the ambient humidity are acquired, and the dew point temperature is calculated based on the ambient temperature and the ambient humidity.
The temperature sensor and the humidity sensor are used for acquiring the ambient temperature Ti and the ambient humidity RHI, and the current dew point temperature Td is obtained according to the acquired Ti and RHI in a table look-up mode, a formula calculation mode and the like.
Step S52: when the ambient temperature is greater than or equal to the set ring temperature, calculating a humidity difference between the ambient humidity and the set humidity.
When the ambient temperature Ti is greater than or equal to 18 ℃, calculating a humidity difference delta RH between the ambient humidity RHI and the set humidity RHs.
Comparing the humidity difference Δrh with the first humidity difference node (10%), when the humidity difference Δrh is >10%, step S53 is performed, when the humidity difference Δrh is <10%, step S54 is performed, and when the humidity difference Δrh=0, step S55 is performed.
Step S53: when the humidity difference is larger than the first humidity difference node, the first evaporation temperature is used as the target evaporation temperature of the indoor heat exchanger, the compressor is controlled to run in an ascending frequency mode, and the indoor fan is controlled to run at a high wind speed.
When DeltaRH >10%, high-efficiency dehumidification control is performed, tl1=7deg.C is taken as an example, 7deg.C is set as the target evaporation temperature of the indoor heat exchanger, when the ambient temperature is higher than 18deg.C, the dew point temperature is far higher than 7deg.C, and high-efficiency dehumidification is realized by dynamically controlling the frequency raising of the compressor and the high-wind speed running of the indoor fan, so that the evaporation temperature is reduced rapidly and the air circulation speed is increased.
Step S54: when the humidity difference is smaller than the first humidity difference node, the second evaporation temperature is used as the target evaporation temperature of the indoor heat exchanger, the compressor is controlled to run in a down-conversion mode, and the indoor fan is controlled to run at a low wind speed.
When Δrh is less than 10%, energy-saving dehumidification control is performed, in this embodiment, the second evaporation temperature Tl2 is slightly less than the dew point temperature Td, and is set as the target evaporation temperature of the indoor heat exchanger by taking tl2=td1 as an example, and the energy-saving dehumidification is achieved and the dehumidification effect is ensured by dynamically controlling the frequency reduction of the compressor and the low wind speed operation of the indoor fan.
Step S55: and stopping the operation of the dehumidification control when the humidity difference value is equal to zero.
When the humidity difference Δrh=0, the system control dehumidification control stops operating.
After any one of the steps S53 to S55 is executed, the ambient temperature and the ambient humidity are detected again, and the steps are repeatedly executed to realize uninterrupted dynamic dehumidification.
Step S56: when the ambient temperature is less than the set loop temperature, the dew point temperature is compared to a low temperature dew point temperature threshold.
When the ambient temperature Ti is less than the set ring temperature of 18 ℃, the low-temperature dynamic dehumidification control is executed, and the low-temperature dew point temperature threshold value of 3 ℃ is further taken as a node in the low-temperature dynamic dehumidification control, so that uninterrupted low-temperature dynamic dehumidification control and intermittent dehumidification control are distinguished.
Step S57: when the dew point temperature is greater than or equal to the low-temperature dew point temperature threshold value, controlling the frequency of the compressor and the wind speed of the indoor fan based on the humidity difference value between the ambient humidity and the set humidity.
The control of low-temperature dynamic dehumidification is basically the same as the control of normal-temperature dynamic dehumidification, and the difference is that the target evaporation temperature of the indoor heat exchanger under the low-temperature dynamic dehumidification working condition is different from the target evaporation temperature of the indoor heat exchanger under the normal-temperature dynamic dehumidification working condition in the control of the compressor frequency Fi and the control of the wind speed F of the indoor fan.
Step S58: when the dew point temperature is less than the low temperature dew point temperature threshold, intermittent dehumidification control is performed.
Example two
In this embodiment, the set ring temperature is set to 18 ℃, the low-temperature dew point temperature threshold is set to 3 ℃, the second humidity difference node for distinguishing efficient dehumidification and energy-saving dehumidification in the low-temperature dynamic dehumidification control is set to 10%, the third evaporation temperature Tl3 is the target evaporation temperature of the indoor heat exchanger in the efficient dehumidification in the low-temperature dynamic dehumidification control, and the fourth evaporation temperature Tl4 is the target evaporation temperature of the indoor heat exchanger in the energy-saving dehumidification in the low-temperature dynamic dehumidification control.
As shown in fig. 6, the method for controlling dehumidification of an air conditioner according to the present embodiment includes:
step S61: the ambient temperature and the ambient humidity are acquired, and the dew point temperature is calculated based on the ambient temperature and the ambient humidity.
The temperature sensor and the humidity sensor are used for acquiring the ambient temperature Ti and the ambient humidity RHI, and the current dew point temperature Td is obtained according to the acquired Ti and RHI in a table look-up mode, a formula calculation mode and the like.
Step S62: when the ambient temperature is greater than or equal to the set ring temperature, calculating a humidity difference between the ambient humidity and the set humidity.
When the ambient temperature Ti is greater than or equal to 18 ℃, calculating a humidity difference delta RH between the ambient humidity RHI and the set humidity RHs.
Comparing the humidity difference Δrh with the first humidity difference node (10%), when the humidity difference Δrh is >10%, step S63 is performed, when the humidity difference Δrh is <10%, step S64 is performed, and when the humidity difference Δrh=0, step S65 is performed.
Step S63: when the humidity difference is larger than the first humidity difference node, the first evaporation temperature is used as the target evaporation temperature of the indoor heat exchanger, the compressor is controlled to run in an ascending frequency mode, and the indoor fan is controlled to run at a high wind speed.
Reference is made specifically to step S53 in embodiment one.
Step S64: when the humidity difference is smaller than the first humidity difference node, the second evaporation temperature is used as the target evaporation temperature of the indoor heat exchanger, the compressor is controlled to run in a down-conversion mode, and the indoor fan is controlled to run at a low wind speed.
Reference is made specifically to step S54 in embodiment one.
Step S65: and stopping the operation of the dehumidification control when the humidity difference value is equal to zero.
With specific reference to step S55 of one embodiment.
After any one of the steps S63 to S65 is executed, the ambient temperature and the ambient humidity are detected again, and the steps are repeatedly executed to realize uninterrupted dynamic dehumidification.
Step S66: when the ambient temperature is less than the set loop temperature, the dew point temperature is compared to a low temperature dew point temperature threshold.
When the ambient temperature Ti is less than the set ring temperature of 18 ℃, the low-temperature dynamic dehumidification control is executed, and the low-temperature dew point temperature threshold value of 3 ℃ is further taken as a node in the low-temperature dynamic dehumidification control, so that uninterrupted low-temperature dynamic dehumidification control and intermittent dehumidification control are distinguished.
Step S67: and when the dew point temperature is greater than or equal to the low-temperature dew point temperature threshold value, calculating a humidity difference value between the environment humidity and the set humidity.
When the ambient temperature Ti is less than 18 ℃ and the dew point temperature Td is greater than or equal to 3 ℃, a humidity difference Δrh between the ambient humidity RHi and the set humidity RHs is calculated.
Comparing the humidity difference Δrh with the second humidity difference node (10%), when the humidity difference Δrh is >10%, step S68 is performed, when the humidity difference Δrh is <10%, step S69 is performed, and when the humidity difference Δrh=0, step S70 is performed.
Step S68: when the humidity difference is larger than the second humidity difference node, the third evaporation temperature is used as the target evaporation temperature of the indoor heat exchanger, the compressor is controlled to run in an ascending frequency mode, and the indoor fan is controlled to run at a high wind speed.
When Δrh is greater than 10%, high-efficiency dehumidification control under low-temperature dynamic dehumidification is performed, taking tl3=2deg.C as an example, setting 2deg.C as the target evaporation temperature of the indoor heat exchanger, and when the ambient temperature is lower than 18 deg.C and the dew point temperature is higher than 3 deg.C, achieving high-efficiency dehumidification by dynamically controlling the frequency raising of the compressor and the high-wind speed running of the indoor fan, so as to achieve rapid reduction of the evaporation temperature and acceleration of the air circulation speed.
Step S69: when the humidity difference is smaller than the second humidity difference node, the fourth evaporation temperature is used as the target evaporation temperature of the indoor heat exchanger, the down-conversion operation of the compressor is controlled, and the low-wind-speed operation of the indoor fan is controlled.
When Δrh is less than 10%, energy-saving dehumidification control under low-temperature dynamic dehumidification control is performed, in this embodiment, the fourth evaporation temperature Tl4 is slightly less than the dew point temperature Td, and is set as the target evaporation temperature of the indoor heat exchanger by taking t4=td-1 as an example, and the energy-saving dehumidification is realized and the dehumidification effect is ensured by dynamically controlling the compressor to perform frequency reduction and the indoor fan to perform low-wind speed operation
Step S70: and stopping the operation of the dehumidification control when the humidity difference value is equal to zero.
When the humidity difference Δrh=0, the system control stops the dehumidification control.
After any one of the steps S68 to S70 is executed, the ambient temperature and the ambient humidity are detected again, and the steps are repeatedly executed to realize uninterrupted dynamic dehumidification.
Step S71: when the dew point temperature is less than the low temperature dew point temperature threshold, intermittent dehumidification control is performed.
In order to support the above proposed method for controlling dehumidification of an air conditioner, the present invention further proposes an air conditioner dehumidification system, as shown in fig. 7, which includes:
a compressor 1 and an indoor fan 2.
The temperature sensor 3 is arranged at the air return opening of the air conditioner and detects the ambient temperature.
The humidity sensor 4 is arranged at an air return port of the air conditioner and detects the ambient humidity.
The acquisition module 5 is included in the air conditioner controller and is used for acquiring the ambient temperature and the ambient humidity.
The dew point temperature calculating module 6 is included in the air conditioner controller for calculating the dew point temperature based on the ambient temperature and the ambient humidity.
The dynamic dehumidification control module 7 is included in the air conditioner controller and is used for controlling the frequency of the compressor 1 and the wind speed of the indoor fan 2 based on the humidity difference value between the ambient humidity and the set humidity when the ambient temperature is greater than or equal to the set ambient temperature.
The low-temperature dynamic dehumidification control module 8 is contained in the air conditioner controller and is used for controlling the frequency of the compressor and the wind speed of the indoor fan based on the humidity difference value of the ambient humidity and the set humidity if the dew point temperature is greater than or equal to the low-temperature dew point temperature threshold value when the ambient temperature is less than the set ambient temperature; if the dew point temperature is less than the low temperature dew point temperature threshold, intermittent dehumidification control is performed.
In the embodiment shown in fig. 8, the dynamic dehumidification control module 7 in the air conditioning dehumidification system according to the present disclosure includes:
and the efficient dehumidification unit 71 is configured to control the compressor 1 to perform frequency-up operation and control the indoor fan 2 to perform high-wind-speed operation by taking the first evaporation temperature as the target evaporation temperature of the indoor heat exchanger when the humidity difference is greater than the first humidity difference node.
The energy-saving dehumidification unit 72 is configured to control the compressor 1 to perform a frequency-reducing operation and control the indoor fan 2 to perform a low wind speed operation by taking the second evaporation temperature as a target evaporation temperature of the indoor heat exchanger when the humidity difference is smaller than the first humidity difference node; and stopping the operation of the dehumidification control when the humidity difference value is equal to zero.
In the embodiment shown in fig. 9, the low-temperature dynamic dehumidification control module 8 in the air conditioner dehumidification system provided by the invention comprises:
and the low-temperature efficient dehumidification unit 81 is used for controlling the frequency-raising operation of the compressor 1 and controlling the high-wind-speed operation of the indoor fan 2 by taking the third evaporation temperature as the target evaporation temperature of the indoor heat exchanger when the humidity difference value is larger than the second humidity difference value node.
The low-temperature energy-saving dehumidification unit 82 is used for controlling the compressor 1 to run in a frequency-reducing mode and controlling the indoor fan 2 to run at a low wind speed by taking the fourth evaporation temperature as the target evaporation temperature of the indoor heat exchanger when the humidity difference value is smaller than the second humidity difference value node; and stopping the operation of the dehumidification control when the humidity difference value is equal to zero.
In the embodiment shown in fig. 10, the low-temperature dynamic dehumidification control module 8 in the air conditioner dehumidification system provided by the invention further comprises:
an intermittent dehumidification control unit 83 for performing intermittent dehumidification control; wherein the intermittent dehumidification control includes the following steps performed in a loop: the temperature lower than the dew point is used as the target evaporation temperature of the indoor heat exchanger, the ascending operation of the compressor is controlled, and the low wind speed operation of the indoor fan is controlled; and after the first set time, controlling the compressor and the indoor fan to stop running for a second set time.
In the embodiment shown in fig. 11, the air conditioning dehumidifying system according to the present invention further comprises a dehumidifying limiting module 9 for controlling the indoor heat exchanger target evaporation temperature to be less than the dew point temperature when the dynamic dehumidifying control module 7 or the low-temperature dynamic dehumidifying module 8 controls the frequency of the compressor and the control of the wind speed of the indoor fan based on the humidity difference between the ambient humidity and the set humidity.
It should be noted that, in the specific implementation process, the control portion may be implemented by a processor in a hardware form executing a computer executing instruction in a software form stored in a memory, which is not described herein, and the program corresponding to the action executed by the control may be stored in a computer readable storage medium of the system in a software form, so that the processor invokes and executes the operation corresponding to each module.
The computer readable storage medium above may include volatile memory, such as random access memory; but may also include non-volatile memory such as read-only memory, flash memory, hard disk, or solid state disk; combinations of the above types of memories may also be included.
The processor referred to above may be a general term for a plurality of processing elements. For example, the processor may be a central processing unit, or may be other general purpose processors, digital signal processors, application specific integrated circuits, field programmable gate arrays or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or may be any conventional processor or the like, but may also be a special purpose processor.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims (8)

1. The air conditioner dehumidification control method is characterized by comprising the following steps of:
acquiring the ambient temperature and the ambient humidity;
calculating a dew point temperature based on the ambient temperature and the ambient humidity;
when the ambient temperature is greater than or equal to the set ambient temperature, controlling the frequency of the compressor and the wind speed of the indoor fan based on the humidity difference value between the ambient humidity and the set humidity;
when the ambient temperature is smaller than the set ambient temperature, if the dew point temperature is larger than or equal to the low-temperature dew point temperature threshold value, controlling the frequency of the compressor and the wind speed of the indoor fan based on the humidity difference value of the ambient humidity and the set humidity; if the dew point temperature is less than the low temperature dew point temperature threshold, executing intermittent dehumidification control;
wherein, based on the humidity difference value of environment humidity and the setting humidity control frequency of compressor and the wind speed of indoor fan, include: when the humidity difference delta RH is larger than a specified value, high-efficiency dehumidification is realized through frequency up-conversion of the compressor and high-speed operation of the indoor fan; when the humidity difference delta RH is smaller than a specified value, energy-saving dehumidification is realized through frequency down-conversion of the compressor and low-speed operation of the indoor fan; stopping the dehumidification control when the humidity difference Δrh is zero;
when the ambient temperature is less than the set temperature and the dew point temperature is less than the low-temperature dew point temperature threshold, the intermittent dehumidification control is executed, and the method specifically comprises the following steps of:
the temperature lower than the dew point is used as the target evaporation temperature of the indoor heat exchanger, the ascending operation of the compressor is controlled, and the low wind speed operation of the indoor fan is controlled;
and after the first set time, controlling the compressor and the indoor fan to stop running for a second set time.
2. The method according to claim 1, wherein when the ambient temperature is equal to or higher than a set ambient temperature, the frequency of the compressor and the wind speed of the indoor fan are controlled based on a humidity difference between the ambient humidity and the set humidity, specifically comprising:
when the humidity difference is larger than the first humidity difference node, the first evaporation temperature is used as the target evaporation temperature of the indoor heat exchanger, the ascending operation of the compressor is controlled, and the high-wind-speed operation of the indoor fan is controlled;
when the humidity difference is smaller than the first humidity difference node, the second evaporation temperature is used as the target evaporation temperature of the indoor heat exchanger, the compressor is controlled to run in a down-conversion mode, and the indoor fan is controlled to run at a low wind speed;
and stopping the operation of the dehumidification control when the humidity difference value is equal to zero.
3. The method according to claim 1, wherein when the ambient temperature is less than the set temperature and the dew point temperature is equal to or higher than the low temperature dew point temperature threshold value, the frequency of the compressor and the wind speed of the indoor fan are controlled based on a humidity difference between the ambient humidity and the set humidity, specifically comprising:
when the humidity difference is larger than the second humidity difference node, the third evaporation temperature is used as the target evaporation temperature of the indoor heat exchanger, the ascending operation of the compressor is controlled, and the high-wind-speed operation of the indoor fan is controlled;
when the humidity difference value is smaller than the second humidity difference value node, the fourth evaporation temperature is used as the target evaporation temperature of the indoor heat exchanger, the down-conversion operation of the compressor is controlled, and the low-wind-speed operation of the indoor fan is controlled;
and stopping the operation of the dehumidification control when the humidity difference value is equal to zero.
4. The air conditioner dehumidification control method according to claim 1, wherein in the control of controlling the frequency of the compressor and the wind speed of the indoor fan based on the humidity difference between the ambient humidity and the set humidity, the method further comprises:
the target evaporation temperature of the indoor heat exchanger is controlled to be smaller than the dew point temperature.
5. An air conditioning dehumidification system comprising:
a compressor and an indoor fan;
the temperature sensor is arranged at the air return port of the air conditioner and used for detecting the ambient temperature;
the humidity sensor is arranged at the air return port of the air conditioner and used for detecting the ambient humidity;
characterized by further comprising:
the acquisition module is used for acquiring the ambient temperature and the ambient humidity;
the dew point temperature calculating module is used for calculating the dew point temperature based on the ambient temperature and the ambient humidity;
the dynamic dehumidification control module is used for controlling the frequency of the compressor and the wind speed of the indoor fan based on the humidity difference value of the ambient humidity and the set humidity when the ambient temperature is greater than or equal to the set ambient temperature;
the low-temperature dynamic dehumidification control module is used for controlling the frequency of the compressor and the wind speed of the indoor fan based on the humidity difference value of the ambient humidity and the set humidity if the dew point temperature is greater than or equal to the low-temperature dew point temperature threshold value when the ambient temperature is smaller than the set ambient temperature; if the dew point temperature is less than the low temperature dew point temperature threshold, executing intermittent dehumidification control;
wherein, based on the humidity difference value of environment humidity and the setting humidity control frequency of compressor and the wind speed of indoor fan, include: when the humidity difference delta RH is larger than a specified value, high-efficiency dehumidification is realized through frequency up-conversion of the compressor and high-speed operation of the indoor fan; when the humidity difference delta RH is smaller than a specified value, energy-saving dehumidification is realized through frequency down-conversion of the compressor and low-speed operation of the indoor fan; stopping the dehumidification control when the humidity difference Δrh is zero;
the low-temperature dynamic dehumidification control module comprises:
an intermittent dehumidification control unit for executing intermittent dehumidification control; the intermittent dehumidification control includes the following steps performed in a cycle:
the temperature lower than the dew point is used as the target evaporation temperature of the indoor heat exchanger, the ascending operation of the compressor is controlled, and the low wind speed operation of the indoor fan is controlled;
and after the first set time, controlling the compressor and the indoor fan to stop running for a second set time.
6. The air conditioning dehumidification system of claim 5, wherein the dynamic dehumidification control module comprises:
the high-efficiency dehumidification unit is used for controlling the ascending frequency operation of the compressor and controlling the high-wind-speed operation of the indoor fan by taking the first evaporation temperature as the target evaporation temperature of the indoor heat exchanger when the humidity difference value is larger than the first humidity difference value node;
the energy-saving dehumidification unit is used for controlling the compressor to run in a frequency-reducing mode and controlling the indoor fan to run at a low wind speed by taking the second evaporation temperature as the target evaporation temperature of the indoor heat exchanger when the humidity difference value is smaller than the first humidity difference value node;
and stopping the operation of the dehumidification control when the humidity difference value is equal to zero.
7. The air conditioning dehumidification system of claim 5, wherein the low temperature dynamic dehumidification control module comprises:
the low-temperature efficient dehumidification unit is used for controlling the ascending operation of the compressor and controlling the high-wind-speed operation of the indoor fan by taking the third evaporation temperature as the target evaporation temperature of the indoor heat exchanger when the humidity difference value is larger than the second humidity difference value node;
the low-temperature energy-saving dehumidification unit is used for controlling the compressor to run in a frequency-reducing mode and controlling the indoor fan to run at a low wind speed by taking the fourth evaporation temperature as the target evaporation temperature of the indoor heat exchanger when the humidity difference value is smaller than the second humidity difference value node;
and stopping the operation of the dehumidification control when the humidity difference value is equal to zero.
8. An air conditioning dehumidification system as set forth in claim 5 further comprising a dehumidification defining module for controlling the indoor heat exchanger target evaporation temperature to be less than the dew point temperature when the dynamic dehumidification control module or the low temperature dynamic dehumidification control module controls the frequency of the compressor and the control of the wind speed of the indoor fan based on the humidity difference of the ambient humidity and the set humidity.
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CN114992723A (en) * 2022-06-02 2022-09-02 浙江普林艾尔电器工业有限公司 Dehumidification device for all-working-condition environment and control method thereof
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