CN111076277A - Energy-saving system and method for accurately controlling fresh air temperature and humidity and air conditioner - Google Patents

Energy-saving system and method for accurately controlling fresh air temperature and humidity and air conditioner Download PDF

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Publication number
CN111076277A
CN111076277A CN201911253287.8A CN201911253287A CN111076277A CN 111076277 A CN111076277 A CN 111076277A CN 201911253287 A CN201911253287 A CN 201911253287A CN 111076277 A CN111076277 A CN 111076277A
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fresh air
temperature
humidity
heat exchanger
control valve
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CN201911253287.8A
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CN111076277B (en
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陈晨
田宇
张士兵
赵振
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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
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located 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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/46—Improving electric energy efficiency or saving
    • 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
    • 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
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/30—Arrangement or mounting of heat-exchangers
    • 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

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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)
  • Air Conditioning Control Device (AREA)

Abstract

The invention relates to an energy-saving system for accurately controlling fresh air temperature and humidity, which comprises a compressor, a four-way reversing valve, an outdoor heat exchanger, a first control valve, a flash evaporator, a second control valve and an indoor side heat exchanger, wherein the outdoor heat exchanger is connected with the compressor; further comprising: the waste heat economizer is communicated with the indoor side heat exchanger; the humidifier is arranged in the waste heat economizer; the fresh air tail end heat exchanger is communicated with the waste heat economizer and is communicated with the outdoor side heat exchanger; one end of a third control valve is communicated with the fresh air tail end heat exchanger, and the other end of the third control valve is communicated with a pipeline between the second control valve and the indoor side heat exchanger; the temperature and humidity sensing system is used for detecting the temperature and humidity of fresh air passing through the outdoor heat exchanger, the waste heat economizer and the fresh air tail end heat exchanger. The energy-saving fresh air system capable of accurately controlling the temperature and the humidity has the advantages of accurate temperature and humidity control, high system energy efficiency and capability of achieving the effects of energy conservation and environmental protection, and further provides a method and an air conditioner for accurately controlling the temperature and the humidity of fresh air.

Description

Energy-saving system and method for accurately controlling fresh air temperature and humidity and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to an energy-saving system for accurately controlling fresh air temperature and humidity, an air conditioner with the energy-saving system for accurately controlling the fresh air temperature and humidity, and a method for accurately controlling the fresh air temperature and humidity by using the energy-saving system for accurately controlling the fresh air temperature and humidity.
Background
The ventilation is required to be carried out according to corresponding standards in industrial production, construction sites, workshops, storehouses, mines and certain equipment rooms.
At present, the constant-temperature and constant-humidity fresh air machine on the market controls humidity by applying the principle of air heat and humidity treatment, the basic process of the constant-temperature and constant-humidity fresh air machine comprises heating, cooling, humidifying, dehumidifying and air mixing, the heating process of the constant-temperature and constant-humidity fresh air machine is heated by electric heating to control temperature, the purposes of constant temperature and constant humidity and temperature and humidity control are achieved, the temperature and humidity control of the fresh air machine is not accurate, the energy efficiency of the system is reduced, energy waste is caused, and the energy is not energy-saving and environment-friendly.
Disclosure of Invention
The invention aims to overcome the problems in the prior art, provides an energy-saving fresh air system which is accurate in temperature and humidity control, high in system energy efficiency and capable of achieving energy-saving and environment-friendly effects and accurately controlling the temperature and the humidity, further provides an air conditioner with the energy-saving system which is accurate in temperature and humidity control, and provides a method for accurately controlling the temperature and the humidity of fresh air by using the energy-saving system which is accurate in temperature and humidity control.
In order to achieve the purpose, the invention adopts the following scheme:
an energy-saving system for accurately controlling fresh air temperature and humidity comprises a compressor, a four-way reversing valve, an outdoor heat exchanger, a first control valve, a flash evaporator, a second control valve and an indoor side heat exchanger; a refrigerating or heating circulating flow path is formed among the compressor, the four-way reversing valve, the outdoor heat exchanger, the first control valve, the flash evaporator, the second control valve and the indoor side heat exchanger; the energy-saving system for accurately controlling the fresh air temperature and humidity further comprises:
a waste heat economizer in communication with the indoor side heat exchanger;
the humidifier is arranged in the waste heat economizer and is used for humidifying fresh air;
the fresh air tail end heat exchanger is communicated with the waste heat economizer and is communicated with the outdoor side heat exchanger; the fresh air sequentially passes through the outdoor heat exchanger, the waste heat economizer and the fresh air tail end heat exchanger;
one end of the third control valve is communicated with the fresh air tail end heat exchanger, and the other end of the third control valve is communicated with a pipeline between the second control valve and the indoor side heat exchanger;
and the temperature and humidity sensing system is used for detecting the temperature and humidity of fresh air passing through the outdoor heat exchanger, the waste heat economizer and the fresh air tail end heat exchanger so as to control and adjust the temperature and the humidity of the fresh air through the first control valve, the second control valve and the third control valve.
Further, the temperature and humidity sensing system comprises:
the first temperature and humidity sensor is used for detecting the temperature and the relative humidity of the fresh air inlet;
the first temperature sensor is used for detecting the temperature of fresh air entering the waste heat economizer;
the second temperature and humidity sensor is used for detecting the temperature and the relative humidity of fresh air entering the fresh air end heat exchanger;
and the second temperature sensor is used for detecting the temperature of the fresh air entering the room.
Further, the air supplementing port of the flash evaporator is communicated with an air suction port of the compressor.
Furthermore, at the fresh air inlet, a fresh air fan is arranged on one side of the outdoor heat exchanger.
Furthermore, one side of the waste heat economizer is provided with a return air fan.
The invention provides an air conditioner which comprises an energy-saving system for accurately controlling fresh air temperature and humidity.
The invention provides a method for accurately controlling fresh air temperature and humidity, which is realized by using the energy-saving system for accurately controlling fresh air temperature and humidity, and comprises the following steps:
s1, detecting the temperature and humidity of fresh air passing through an outdoor heat exchanger, a waste heat economizer and a fresh air tail end heat exchanger to obtain the temperature T0 and the humidity N0 of a fresh air inlet;
and S2, judging according to the set target temperature T and the target relative humidity N and the temperature T0 and the humidity N0 of the fresh air inlet, and determining that the system enters a refrigeration mode or a heating mode to control and regulate the temperature and the humidity of the fresh air.
Further, the determination is performed according to the set target temperature T, the target relative humidity N, and the temperature T0 and the humidity N0 of the fresh air inlet, and it is determined that the system enters a cooling mode or a heating mode to control and adjust the temperature and the humidity of the fresh air, and the specific steps include:
s21, calculating △ T and △ N according to a set target temperature T, a target relative humidity N, a temperature T0 of a fresh air inlet and a humidity N0, and judging according to △ T and △ N, wherein △ T-T0-T and △ N-N0-N;
s22, if △ T is less than 0, △ N is less than 0, entering a heating mode to control and adjust the temperature and humidity of fresh air;
s23, if △ T is greater than 0, △ N is less than 0, entering a refrigeration mode to control and adjust the temperature and humidity of fresh air;
s24, if △ T is less than 0, △ N is more than 0, entering a heating mode to control and adjust the temperature and humidity of fresh air;
and S25, if △ T is greater than 0, △ N is greater than 0, entering a refrigeration mode to control and regulate the temperature and humidity of fresh air.
Further, in step S22, entering a heating mode to control and adjust the fresh air temperature and humidity specifically includes:
preliminarily setting the running frequency of the compressor by the size of | △ T |;
the running frequency of the compressor is corrected through the positive and negative values and the size of △ T1, wherein △ T1 is calculated through the difference between the temperature T1 of fresh air entering the waste heat economizer and a target temperature T, namely △ T1-T1-T;
setting the preliminary humidification quantity through △ N and the rotating speed of a fresh air fan;
the humidification quantity is corrected through the positive and negative values and the size of △ N2, wherein △ N2 is calculated through the difference between the relative humidity N2 of fresh air entering the fresh air end heat exchanger and the target relative humidity N, namely △ N2 is N2-N;
the heating capacity is corrected by adjusting a second control valve through the positive and negative values and the sizes of △ T2, wherein △ T2 is calculated through the difference between the temperature T2 of fresh air entering the fresh air tail end heat exchanger and the target temperature T, namely △ T2 is T2-T;
the heating capacity is corrected by adjusting a third control valve according to the positive and negative values and the size of △ T3, wherein △ T3 is calculated according to the difference between the temperature T3 of fresh air entering a room and a target temperature T, namely △ T3 is T3-T;
and finishing the adjustment.
Further, in the step S23, entering the cooling mode to control and adjust the fresh air temperature and humidity specifically includes:
preliminarily setting the running frequency of the compressor by the size of | △ T |;
the running frequency of the compressor is corrected through the positive and negative values and the size of △ T1, wherein △ T1 is calculated through the difference between the temperature T1 of fresh air entering the waste heat economizer and a target temperature T, namely △ T1-T1-T;
setting the preliminary humidification quantity through △ N and the rotating speed of a fresh air fan;
the humidification quantity is corrected through the positive and negative values and the size of △ N2, wherein △ N2 is calculated through the difference between the relative humidity N2 of fresh air entering the fresh air end heat exchanger and the target relative humidity N, namely △ N2 is N2-N;
the refrigerating capacity is corrected by adjusting a second control valve through the positive and negative values and the size of △ T2, wherein △ T2 is calculated through the difference between the temperature T2 of fresh air entering the fresh air end heat exchanger and a target temperature T, namely △ T2 is T2-T;
the refrigerating capacity is corrected by adjusting a third control valve through the positive and negative values and the size of △ T3, wherein △ T3 is calculated through the difference between the temperature T3 of fresh air entering the room and the target temperature T, namely △ T3 is T3-T;
and finishing the adjustment.
Further, in step S24, entering a heating mode to control and adjust the fresh air temperature and humidity specifically includes:
preliminarily setting the operating frequency of the compressor according to the size of | △ T ' |, wherein △ T ' is calculated by the difference between the dew point temperature T ' of the fresh air inlet and the target temperature T, namely △ T ' ═ T ' -T;
the running frequency of the compressor is corrected through the positive and negative values and the size of △ T1, wherein △ T1 is calculated through the difference between the temperature T1 of fresh air entering the waste heat economizer and a target temperature T, namely △ T1-T1-T;
setting the preliminary humidification quantity through △ N and the rotating speed of a fresh air fan;
the humidification quantity is corrected through the positive and negative values and the size of △ N2, wherein △ N2 is calculated through the difference between the relative humidity N2 of fresh air entering the fresh air end heat exchanger and the target relative humidity N, namely △ N2 is N2-N;
the heating capacity is corrected by adjusting a second control valve through the positive and negative values and the sizes of △ T2, wherein △ T2 is calculated through the difference between the temperature T2 of fresh air entering the fresh air tail end heat exchanger and the target temperature T, namely △ T2 is T2-T;
the heating capacity is corrected by adjusting a third control valve according to the positive and negative values and the size of △ T3, wherein △ T3 is calculated according to the difference between the temperature T3 of fresh air entering a room and a target temperature T, namely △ T3 is T3-T;
and finishing the adjustment.
Further, in the step S25, entering the cooling mode to control and adjust the fresh air temperature and humidity specifically includes:
preliminarily setting the operating frequency of the compressor according to the size of | △ T ' |, wherein △ T ' is calculated by the difference between the dew point temperature T ' of the fresh air inlet and the target temperature T, namely △ T ' ═ T ' -T;
the running frequency of the compressor is corrected through the positive and negative values and the size of △ T1, wherein △ T1 is calculated through the difference between the temperature T1 of fresh air entering the waste heat economizer and a target temperature T, namely △ T1-T1-T;
setting the preliminary humidification quantity through △ N and the rotating speed of a fresh air fan;
the humidification quantity is corrected through the positive and negative values and the size of △ N2, wherein △ N2 is calculated through the difference between the relative humidity N2 of fresh air entering the fresh air end heat exchanger and the target relative humidity N, namely △ N2 is N2-N;
the refrigerating capacity is corrected by adjusting a second control valve through the positive and negative values and the size of △ T2, wherein △ T2 is calculated through the difference between the temperature T2 of fresh air entering the fresh air end heat exchanger and a target temperature T, namely △ T2 is T2-T;
the refrigerating capacity is corrected by adjusting a third control valve through the positive and negative values and the size of △ T3, wherein △ T3 is calculated through the difference between the temperature T3 of fresh air entering the room and the target temperature T, namely △ T3 is T3-T;
and finishing the adjustment.
Further, the step of correcting the operating frequency of the compressor through the positive, negative and large values of △ T1 specifically includes:
if △ T1 is positive, then the compressor frequency is decreased;
if △ T1 is negative, the correction frequency increases based on the original frequency, | △ T1| is larger.
Further, the correcting the humidification amount through the positive and negative and the size of △ N2 specifically includes:
if △ N2 is positive, the humidifier is turned off;
if △ N2 is negative, the amount of humidification increases in addition to the original amount of humidification, | △ N2| is larger, and the corrected amount of humidification is higher.
Further, the step of correcting the heating capacity by adjusting the second control valve through the positive and negative values and the size of △ T2 specifically includes:
if △ T2 is positive, decreasing the second control valve opening;
if △ T2 is negative, the second control valve opening is increased.
Further, the correction of the heating capacity through the adjustment of the third control valve by the positive and negative values and the magnitude of △ T3 specifically includes:
if △ T3 is positive, then the third control valve opening is decreased;
if △ T3 is negative, the third control valve opening is increased.
Compared with the prior art, the invention has the following advantages:
the energy-saving system for accurately controlling the temperature and the humidity of the fresh air is characterized in that a waste heat economizer and a fresh air tail end heat exchanger are additionally arranged on the basis of a refrigeration or heating circulating flow path formed by a compressor, a four-way reversing valve, an outdoor heat exchanger, a first control valve, a flash evaporator, a second control valve and an indoor side heat exchanger, and fresh air sequentially passes through the outdoor heat exchanger, the waste heat economizer and the fresh air tail end heat exchanger, so that a part of refrigerant is conveyed to the waste heat economizer and the fresh air tail end heat exchanger, the dehumidified fresh air is heated, and then the third control valve, a temperature and humidity sensing system and a humidifier are combined, so that the aim of accurately controlling the temperature and the humidity is fulfilled, the problems of low heating efficiency and high energy consumption of the conventional electric heating mode are solved, the energy efficiency of the system.
Drawings
The present application will be described in further detail with reference to the following drawings and detailed description.
Fig. 1 is a system schematic diagram of the energy-saving system for accurately controlling fresh air temperature and humidity during refrigeration.
Fig. 2 is a system schematic diagram of the energy-saving system for accurately controlling fresh air temperature and humidity in the heating process.
Fig. 3 is a control flow chart of the method for accurately controlling fresh air temperature and humidity according to the invention.
Fig. 4 is a detailed control flow chart of the step S2 in the method for accurately controlling fresh air temperature and humidity according to the present invention.
The figure includes:
the system comprises a compressor 1, a four-way reversing valve 2, an outdoor heat exchanger 3, a first control valve 4, a flash evaporator 5, a second control valve 6, an indoor side heat exchanger 7, a waste heat economizer 8, a humidifier 9, a fresh air tail end heat exchanger 10, a third control valve 11, a temperature and humidity sensing system 12, a first temperature and humidity sensor 121, a first temperature sensor 122, a second temperature and humidity sensor 123, a second temperature sensor 124, a fresh air fan 13 and a return air fan 14.
Detailed Description
The present application is further described in conjunction with the following examples.
Referring to fig. 1 to 4, an energy saving system for accurately controlling fresh air temperature and humidity comprises a compressor 1, a four-way reversing valve 2, an outdoor heat exchanger 3, a first control valve 4, a flash evaporator 5, a second control valve 6 and an indoor heat exchanger 7; a refrigerating or heating circulating flow path is formed among the compressor 1, the four-way reversing valve 2, the outdoor heat exchanger 3, the first control valve 4, the flash evaporator 5, the second control valve 6 and the indoor side heat exchanger 7; specifically, pipeline communication is arranged between the compressor 1 and a first port of the four-way reversing valve 2, between a second port of the four-way reversing valve 2 and the outdoor heat exchanger 3, between the outdoor heat exchanger 3 and the first control valve 4, between the first control valve 4 and the flash evaporator 5, between the flash evaporator 5 and the second control valve 6, between the second control valve 6 and the indoor side heat exchanger 7, between the indoor side heat exchanger 7 and a third port of the four-way reversing valve 2, and between a fourth port of the four-way reversing valve 2 and the compressor 1. And the air supplementing port of the flash evaporator 5 is communicated with the air suction port of the compressor 1. The energy-saving system for accurately controlling the fresh air temperature and humidity further comprises a waste heat economizer 8, a humidifier 9, a fresh air tail end heat exchanger 10, a third control valve 11 and a temperature and humidity sensing system 12. Wherein the waste heat economizer 8 is communicated with the indoor side heat exchanger 7; the humidifier 9 is arranged in the waste heat economizer 8 and is used for humidifying fresh air; the fresh air tail end heat exchanger 10 is communicated with the waste heat economizer 8 and is communicated with an outdoor side heat exchanger; the fresh air sequentially passes through the outdoor heat exchanger 3, the waste heat economizer 8 and the fresh air end heat exchanger 10; one end of a third control valve 11 is communicated with the fresh air tail end heat exchanger 10, and the other end of the third control valve is communicated with a pipeline between the second control valve 6 and the indoor side heat exchanger 7; the temperature and humidity sensing system 12 is used for detecting the temperature and humidity of fresh air passing through the outdoor heat exchanger 3, the waste heat economizer 8 and the fresh air end heat exchanger 10 so as to control and adjust the temperature and humidity of the fresh air through the first control valve 4, the second control valve 6 and the third control valve 11. The first control valve 4, the second control valve 6 and the third control valve 11 are a first expansion valve, a second expansion valve and a third expansion valve, and the first expansion valve, the second expansion valve and the third expansion valve are preferably electronic expansion valves.
This energy-saving system of accurate control new trend humiture is through on the basis of compressor 1, four-way reversing valve 2, outdoor heat exchanger 3, first control valve 4, flash vessel 5, the refrigeration or heating circulation flow path that second control valve 6 and indoor side heat exchanger 7 formed, add waste heat economizer 8 and the terminal heat exchanger 10 of new trend, the new trend passes through outdoor heat exchanger 3 in proper order, waste heat economizer 8, the terminal heat exchanger 10 of new trend, make partly refrigerant carry to waste heat economizer 8 and the terminal heat exchanger 10 of new trend, the new trend after the heating dehumidification, rethread third control valve 11, temperature and humidity sensing system 12 and humidifier 9 combine together, reach the purpose of humiture accurate control, the low problem that the heating efficiency of current electric heating mode is big has been reduced, the energy efficiency of improvement system, avoid the waste of resources, can reach energy-concerving and environment-protective effect.
This economizer system's of accurate control new trend humiture heats flow:
the refrigerant is compressed by the compressor 1 and then becomes a high-temperature high-pressure state, then flows into the indoor side heat exchanger 7 through the four-way reversing valve 2, then is divided into two paths after exiting from the indoor side heat exchanger 7, and a part of refrigerant reaches the outdoor side heat exchanger after passing through the fresh air tail end heat exchanger 10; the other part of the refrigerant enters a flash evaporator 5, the refrigerant flowing into the flash evaporator 5 is divided into two parts through the flash evaporation function, one part of the gaseous refrigerant enters a compressor 1 for supplying air, the other part of the liquid refrigerant is mixed with the refrigerant flowing out of the fresh air terminal heat exchanger 10 and then enters an outdoor side heat exchanger, and finally the refrigerant and the fresh air terminal heat exchanger return to the compressor 1 together to complete the heating cycle.
A refrigeration process:
the refrigerant is compressed by the compressor 1 and then becomes a high-temperature high-pressure state, then flows into the outdoor heat exchanger for condensation through the four-way reversing valve 2, is divided into two paths after flowing out of the outdoor heat exchanger, and part of the refrigerant flows through the fresh air tail end heat exchanger 10 for heat exchange; the other part of the refrigerant enters the flash evaporator 5 through the first control valve 4, the refrigerant flowing into the flash evaporator 5 is divided into two parts through the flash evaporation effect, one part of the gaseous refrigerant enters the compressor 1 for air supply, and the liquid refrigerant passes through the second control valve 6, is mixed with the refrigerant flowing out of the fresh air end heat exchanger 10, enters the indoor side heat exchanger 7 for heat exchange and then returns to the compressor 1, so that the circulation is completed.
The temperature and humidity sensing system 12 includes a first temperature and humidity sensor 121, a first temperature sensor 122, a second temperature and humidity sensor 123, and a second temperature sensor 124. The first temperature and humidity sensor 121 is used for detecting the temperature and the relative humidity of the fresh air inlet; the first temperature sensor 122 is used for detecting the temperature of the fresh air after heat exchange with the refrigerant, namely the temperature of the fresh air entering the waste heat economizer 8; the second temperature and humidity sensor 123 is used for detecting the temperature of the fresh air after heat exchange, humidification and dehumidification through the waste heat exchanger, namely the temperature and the relative humidity of the fresh air entering the fresh air end heat exchanger 10; the second temperature sensor 124 is used for detecting the temperature of the fresh air flowing out of the outlet of the fresh air end heat exchanger 10, namely the temperature of the fresh air entering the room.
In the present embodiment, a fresh air blower 13 is disposed on one side of the outdoor heat exchanger 3. And a return air fan 14 is arranged on one side of the waste heat economizer 8. By controlling the rotating speed of the fresh air fan 13, the flow of fresh air passing through the outdoor heat exchanger 3, the waste heat economizer 8 and the fresh air terminal heat exchanger 10 is adjusted, and the humidification quantity of the fresh air can be adjusted. And the arrangement of the return air fan 14 is beneficial to heat exchange between the waste heat economizer 8 and the return air, is convenient for heat source recycling, is used for fresh air temperature regulation, is energy-saving and environment-friendly, and avoids resource waste.
The invention provides an air conditioner which comprises an energy-saving system for accurately controlling fresh air temperature and humidity. Through setting up this economizer system of accurate control new trend humiture on the air conditioner, can reach the purpose of humiture accurate control, reduced the problem that heating efficiency of current electric heating mode is low, the energy consumption is big, improve the system efficiency, avoid the wasting of resources, can reach energy-concerving and environment-protective effect, improve the wholeness ability of air conditioner.
The invention provides a method for accurately controlling fresh air temperature and humidity, which is realized by using the energy-saving system for accurately controlling fresh air temperature and humidity, and comprises the following steps:
s1, detecting the temperature and humidity of fresh air passing through an outdoor heat exchanger 3, a waste heat economizer 8 and a fresh air tail end heat exchanger 10 to obtain the temperature T0 and the humidity N0 of a fresh air inlet;
s2, judging according to a set target temperature T and a target relative humidity N and the temperature T0 and the humidity N0 of the fresh air inlet, and determining that the system enters a refrigeration mode or a heating mode to control and adjust the temperature and the humidity of the fresh air; the method comprises the following specific steps:
s21, △ T and △ N are calculated according to a set target temperature T, a target relative humidity N, a temperature T0 of a fresh air inlet and a humidity N0, and the judgment is carried out according to △ T and △ N, wherein △ T-T0-T and △ N-N0-N.
S22, if △ T <0, △ N <0, entering a heating mode to control and adjust the fresh air temperature and humidity, in the step S △, entering the heating mode to control and adjust the fresh air temperature and humidity specifically comprises the steps of preliminarily setting the operation frequency of the compressor 1 according to the size of | △ T |, correcting the operation frequency of the compressor 1 according to the positive and negative sizes of △ T △, specifically, reducing the frequency of the compressor 1 according to the positive and negative sizes of △ T △, increasing the △ T △ | on the basis of the original frequency if the △ T is negative, setting the preliminary humidification quantity according to the △ N and the rotation speed of the fresh air fan 13 if the correction frequency is larger, correcting the humidification quantity according to the positive and negative sizes of △ N △, specifically, closing the humidifier 9 if the △ N △ is positive, increasing the humidification quantity on the basis of the original humidification quantity if the △ N △ is negative, increasing the correction frequency of the positive and the negative opening of the third △ T3611, and increasing the third control of the positive and negative heat control of the △ T △, and increasing the third control of the positive and negative heat control of the △ T △.
S23, if △ T is greater than 0, the control of fresh air temperature and humidity is carried out in a refrigeration mode, if △ N is less than 0, the control of fresh air temperature and humidity is carried out in the refrigeration mode, in the step S24, the control of fresh air temperature and humidity in the refrigeration mode specifically comprises the steps of preliminarily setting the operation frequency of the compressor 1 through the size of △ T, correcting the operation frequency of the compressor 1 through the positive and negative and the size of △ T1, setting the preliminary humidification quantity through △ N and the rotating speed of the fresh air fan 13, correcting the humidification quantity through the positive and negative and the size of △ N2, correcting the refrigeration quantity through the positive and negative and the size of △ T2 by adjusting the second control valve 6, correcting the refrigeration quantity through the positive and negative and the size of △ T3 and correcting the refrigeration quantity through.
S24, if △ T is less than 0, △ N >0, entering a heating mode to control and adjust the temperature and humidity of fresh air, and in the step S25, entering the heating mode to control and adjust the temperature and humidity of the fresh air specifically comprises the steps of preliminarily setting the operation frequency of the compressor 1 through the size of △ T' |, correcting the operation frequency of the compressor 1 through the positive and negative and the size of △ T1, setting the preliminary humidification quantity through △ N and the rotating speed of the fresh air fan 13, correcting the humidification quantity through the positive and negative and the size of △ N2, correcting the heating quantity through adjusting the second control valve 6 through the positive and negative and the size of △ T2, correcting the heating quantity through adjusting the third control valve 11 through the positive and negative and the size of △ T3, and finishing the adjustment.
S25, if △ T is greater than 0, △ N is greater than 0, the fresh air temperature and humidity are controlled and adjusted in a refrigeration mode, in the step S26, the operation frequency of the compressor 1 is preliminarily set through the size of △ T' |, the operation frequency of the compressor 1 is corrected through the positive and negative sizes of △ T1, preliminary humidification quantity setting is conducted through △ N and the rotation speed of the fresh air fan 13, humidification quantity is corrected through the positive and negative sizes of △ N2, refrigeration quantity is corrected through adjusting the positive and negative sizes of △ T2 through adjusting the second control valve 6, refrigeration quantity is corrected through the positive and negative sizes of △ T3 through adjusting the third control valve 11, and adjustment is finished.
The specific principles and methods of the step S23, the step S24, the step S25 and the step S22 are the same.
In this embodiment, the control parameters of the energy saving system for accurately controlling the fresh air temperature and humidity are as follows:
the first temperature and humidity sensor 121 is used for detecting the temperature T0, the relative humidity N0 and the dew point temperature T' of the fresh air inlet; the first temperature sensor 122 is configured to detect a temperature after heat exchange between the fresh air and the refrigerant, that is, a temperature T1 at which the fresh air enters the waste heat economizer 8; the second temperature and humidity sensor 123 is configured to detect a temperature of the fresh air after heat exchange, humidification and dehumidification by the waste heat exchanger, that is, a temperature T2 and a relative humidity N2 of the fresh air entering the fresh air end heat exchanger 10; the second temperature sensor 124 is used for detecting the temperature of the fresh air flowing out of the outlet of the fresh air end heat exchanger 10, namely the temperature T3 of the fresh air entering the room.
△T＝T0-T、△N＝N0-N、△T1＝T1-T、△T2＝T2-T、△N2＝N2-N、△T3＝T3-T、△T′＝T′-T；
In the operation of the energy-saving system for accurately controlling the fresh air temperature and humidity, if the probability that △ T, △ N, △ T1, △ 1T2, △ N2, △ 3T3 and △ T' is 0 is very small, the probability can be ignored, and if the probability is 0, the operation can be continued without adjusting the cooling mode or the heating mode.
In the method, when T <0 and N <0 are detected, namely when the temperature and humidity of fresh air are lower than a target value, the four-way reversing valve 2 is powered on, the system is in a heating mode, the third control valve 11 is opened to reset, the compressor 1 preliminarily determines frequency operation according to the value of 0T (difference between the fresh air and the target temperature), the frequency of the compressor 1 is corrected according to the positive and negative values and the value of 1T (difference between the fresh air at the outlet of the indoor heat exchanger 7 and the target temperature), if 2T is positive, the temperature of the fresh air reaches the target temperature, the compressor 1 is subjected to frequency reduction processing, if 3T is negative, the compressor 1 is subjected to frequency increase operation with different frequencies according to the value of 4T, the fresh air heated by the indoor heat exchanger 7 enters the waste heat economizer 8, the humidification amount can be calculated according to the value of 5N (difference between the fresh air inlet and the target relative humidity) and the rotating speed (L/m) of the fresh air fan 13, then the fresh air is corrected according to the value of 4T, if the value of 5N (difference between the fresh air inlet and the target relative humidity) and the fresh air temperature, the humidity is greater than the value of the T, the T is smaller, the humidity of the T, the humidifier, the humidity of the fresh air enters the humidifier 6N, the humidifier is reduced to the value of the humidifier, the humidity of the humidifier, if the humidifier 6N is reduced to the humidity of the humidifier, the humidifier is reduced to the humidity of the humidifier, if the humidifier 6N is reduced to the humidifier, the humidity of the humidifier, the humidifier is reduced to a value of the humidifier, the humidifier to the humidity of the humidifier to a value of the humidity of the humidifier, the humidity of the humidifier, the humidifier is reduced to the humidity of the humidifier, if the humidity of the humidifier.
When △ T is greater than 0 and △ N is less than 0, namely the temperature of fresh air is higher than the target temperature and the humidity is lower than the target humidity, the basic principle is the same as the above, the four-way reversing valve 2 is not electrified, the system is in a refrigeration mode, the third control valve 11 is opened to reset, the compressor 1 preliminarily determines the frequency operation according to the △ T, the frequency of the compressor 1 is corrected through the positive and negative values and the magnitude of △ T1, the fresh air cooled through the indoor side heat exchanger 7 flows into the indoor waste heat economizer 8, the humidification quantity can be calculated according to the magnitude of △ N and the rotating speed of the fan 1, the humidification quantity is corrected according to the positive and negative values and the magnitude of △ N2, the humidification quantity of the humidifier 9 is finely adjusted, the fresh air finally flows into the fresh air end heat exchanger 10, the positive and negative values and the magnitude of the fresh air of △ T2 are adjusted to control the flow of the second control valve 6, the flow of the refrigerant flowing into the indoor side heat exchanger 7 is controlled, the final end cooling is performed on the fresh air, meanwhile, the partially subcooled refrigerant flows into the indoor side heat exchanger 7, the final fresh air heat exchange efficiency of the system is increased, and the temperature of the third.
When △ T <0, △ N >0 is detected, namely the temperature of fresh air is lower than the target temperature and the humidity is higher than the target humidity, the basic principle is the same as the above, the four-way reversing valve 2 is electrified, the system is in a heating mode, the third control valve 11 is opened to reset, the compressor 1 preliminarily determines the frequency operation according to the △ T', then corrects the frequency of the compressor 1 according to the positive and negative values and the size of △ T4 to ensure that △ N <0 is not higher than the target humidity, the fresh air heated by the indoor side heat exchanger 7 flows into the indoor waste heat economizer 8, the humidification quantity can be calculated according to the size of △ N and the rotating speed of a fan, the humidification quantity is corrected according to the positive and negative values and the size of △ T2 to accurately control the humidity of the fresh air, the fresh air finally flows into the fresh air end heat exchanger 10, the fresh air finally flows into the second control valve 6 to control the flow of the refrigerant flowing into the indoor side heat exchanger 4837 to accurately control the flow of the final fresh air heating temperature of the fresh air through the positive and negative values of the third fresh air heating valve 3 to accurately control the temperature of the positive and the third fresh air heating valve 3.
When △ T >0 and △ N >0 are detected, namely the temperature and humidity of fresh air are higher than a target value, the four-way reversing valve 2 is not electrified, the system is in a refrigeration mode, the third control valve 11 is opened to reset, the compressor 1 preliminarily determines the frequency operation according to the △ T', the frequency of the compressor 1 is corrected through the positive and negative values and the value of △ T1, △ N <0 is ensured, the fresh air heated by the indoor side heat exchanger 7 flows into the indoor waste heat economizer 8, the humidification quantity can be calculated according to the value of △ N and the rotating speed of the fan, the humidification quantity is corrected according to the positive and negative values and the value of △ N2, so that the fine adjustment is carried out on the humidification quantity of the humidifier 9, the fresh air finally flows into the fresh air tail end heat exchanger 10, the positive and negative values and the value of △ T2 to adjust the second control valve 6 so as to control the flow of the refrigerant flowing into the indoor side heat exchanger 7, the final tail end cooling of the fresh air flows into the indoor side heat exchanger 7, the heat exchange efficiency of the system is increased, and the temperature and the humidity of the third fresh air temperature and the humidity are accurately controlled through the fine adjustment △ T.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the protection scope of the present application, and although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.

Claims (16)

1. An energy-saving system for accurately controlling fresh air temperature and humidity comprises a compressor, a four-way reversing valve, an outdoor heat exchanger, a first control valve, a flash evaporator, a second control valve and an indoor side heat exchanger; a refrigerating or heating circulating flow path is formed among the compressor, the four-way reversing valve, the outdoor heat exchanger, the first control valve, the flash evaporator, the second control valve and the indoor side heat exchanger; its characterized in that, the economizer system of accurate control new trend humiture still includes:
a waste heat economizer in communication with the indoor side heat exchanger;
the humidifier is arranged in the waste heat economizer and is used for humidifying fresh air;
the fresh air tail end heat exchanger is communicated with the waste heat economizer and is communicated with the outdoor side heat exchanger; the fresh air sequentially passes through the outdoor heat exchanger, the waste heat economizer and the fresh air tail end heat exchanger;
one end of the third control valve is communicated with the fresh air tail end heat exchanger, and the other end of the third control valve is communicated with a pipeline between the second control valve and the indoor side heat exchanger;
and the temperature and humidity sensing system is used for detecting the temperature and humidity of fresh air passing through the outdoor heat exchanger, the waste heat economizer and the fresh air tail end heat exchanger so as to control and adjust the temperature and the humidity of the fresh air through the first control valve, the second control valve and the third control valve.
2. The energy-saving system for accurately controlling fresh air temperature and humidity according to claim 1; characterized in that, temperature and humidity sensing system includes:
the first temperature and humidity sensor is used for detecting the temperature and the relative humidity of the fresh air inlet;
the first temperature sensor is used for detecting the temperature of fresh air entering the waste heat economizer;
the second temperature and humidity sensor is used for detecting the temperature and the relative humidity of fresh air entering the fresh air end heat exchanger;
and the second temperature sensor is used for detecting the temperature of the fresh air entering the room.
3. The energy-saving system for accurately controlling fresh air temperature and humidity according to claim 1; the air supplementing port of the flash evaporator is communicated with an air suction port of the compressor.
4. The energy-saving system for accurately controlling fresh air temperature and humidity according to claim 2; the outdoor heat exchanger is characterized in that a fresh air fan is arranged at one side of the outdoor heat exchanger at a fresh air inlet.
5. The energy-saving system for accurately controlling fresh air temperature and humidity according to claim 1; the waste heat economizer is characterized in that a return air fan is arranged on one side of the waste heat economizer.
6. An air conditioner, characterized in that, comprising the energy-saving system for accurately controlling fresh air temperature and humidity according to any one of claims 1 to 5.
7. A method for accurately controlling fresh air temperature and humidity is characterized by being realized by using the energy-saving system for accurately controlling fresh air temperature and humidity as claimed in claim 4, and comprising the following steps of:
s1, detecting the temperature and humidity of fresh air passing through an outdoor heat exchanger, a waste heat economizer and a fresh air tail end heat exchanger to obtain the temperature T0 and the humidity N0 of a fresh air inlet;
and S2, judging according to the set target temperature T and the target relative humidity N and the temperature T0 and the humidity N0 of the fresh air inlet, and determining that the system enters a refrigeration mode or a heating mode to control and regulate the temperature and the humidity of the fresh air.
8. The method for accurately controlling fresh air temperature and humidity according to claim 7; the method is characterized in that the temperature T0 and the humidity N0 of the fresh air inlet are judged according to the set target temperature T and the target relative humidity N, and the system is determined to enter a refrigeration mode or a heating mode to control and adjust the temperature and the humidity of the fresh air, and the method specifically comprises the following steps:
s21, calculating △ T and △ N according to a set target temperature T, a target relative humidity N, a temperature T0 of a fresh air inlet and a humidity N0, and judging according to △ T and △ N, wherein △ T-T0-T and △ N-N0-N;
s22, if △ T is less than 0, △ N is less than 0, entering a heating mode to control and adjust the temperature and humidity of fresh air;
s23, if △ T is greater than 0, △ N is less than 0, entering a refrigeration mode to control and adjust the temperature and humidity of fresh air;
s24, if △ T is less than 0, △ N is more than 0, entering a heating mode to control and adjust the temperature and humidity of fresh air;
and S25, if △ T is greater than 0, △ N is greater than 0, entering a refrigeration mode to control and regulate the temperature and humidity of fresh air.
9. The method for accurately controlling fresh air temperature and humidity according to claim 8; the method is characterized in that in the step S22, the step of entering a heating mode to control and adjust the fresh air temperature and humidity specifically comprises the following steps:
preliminarily setting the running frequency of the compressor by the size of | △ T |;
the running frequency of the compressor is corrected through the positive and negative values and the size of △ T1, wherein △ T1 is calculated through the difference between the temperature T1 of fresh air entering the waste heat economizer and a target temperature T, namely △ T1-T1-T;
setting the preliminary humidification quantity through △ N and the rotating speed of a fresh air fan;
the humidification quantity is corrected through the positive and negative values and the size of △ N2, wherein △ N2 is calculated through the difference between the relative humidity N2 of fresh air entering the fresh air end heat exchanger and the target relative humidity N, namely △ N2 is N2-N;
the heating capacity is corrected by adjusting a second control valve through the positive and negative values and the sizes of △ T2, wherein △ T2 is calculated through the difference between the temperature T2 of fresh air entering the fresh air tail end heat exchanger and the target temperature T, namely △ T2 is T2-T;
the heating capacity is corrected by adjusting a third control valve according to the positive and negative values and the size of △ T3, wherein △ T3 is calculated according to the difference between the temperature T3 of fresh air entering a room and a target temperature T, namely △ T3 is T3-T;
and finishing the adjustment.
10. The method for accurately controlling fresh air temperature and humidity according to claim 8; the method is characterized in that in the step S23, the step of entering the refrigeration mode to control and adjust the fresh air temperature and humidity specifically comprises the following steps:
preliminarily setting the running frequency of the compressor by the size of | △ T |;
the running frequency of the compressor is corrected through the positive and negative values and the size of △ T1, wherein △ T1 is calculated through the difference between the temperature T1 of fresh air entering the waste heat economizer and a target temperature T, namely △ T1-T1-T;
setting the preliminary humidification quantity through △ N and the rotating speed of a fresh air fan;
the humidification quantity is corrected through the positive and negative values and the size of △ N2, wherein △ N2 is calculated through the difference between the relative humidity N2 of fresh air entering the fresh air end heat exchanger and the target relative humidity N, namely △ N2 is N2-N;
the refrigerating capacity is corrected by adjusting a second control valve through the positive and negative values and the size of △ T2, wherein △ T2 is calculated through the difference between the temperature T2 of fresh air entering the fresh air end heat exchanger and a target temperature T, namely △ T2 is T2-T;
the refrigerating capacity is corrected by adjusting a third control valve through the positive and negative values and the size of △ T3, wherein △ T3 is calculated through the difference between the temperature T3 of fresh air entering the room and the target temperature T, namely △ T3 is T3-T;
and finishing the adjustment.
11. The method for accurately controlling fresh air temperature and humidity according to claim 8; the method is characterized in that in the step S24, the step of entering a heating mode to control and adjust the fresh air temperature and humidity specifically comprises the following steps:
preliminarily setting the operating frequency of the compressor according to the size of | △ T ' |, wherein △ T ' is calculated by the difference between the dew point temperature T ' of the fresh air inlet and the target temperature T, namely △ T ' ═ T ' -T;
the running frequency of the compressor is corrected through the positive and negative values and the size of △ T1, wherein △ T1 is calculated through the difference between the temperature T1 of fresh air entering the waste heat economizer and a target temperature T, namely △ T1-T1-T;
setting the preliminary humidification quantity through △ N and the rotating speed of a fresh air fan;
the humidification quantity is corrected through the positive and negative values and the size of △ N2, wherein △ N2 is calculated through the difference between the relative humidity N2 of fresh air entering the fresh air end heat exchanger and the target relative humidity N, namely △ N2 is N2-N;
the heating capacity is corrected by adjusting a second control valve through the positive and negative values and the sizes of △ T2, wherein △ T2 is calculated through the difference between the temperature T2 of fresh air entering the fresh air tail end heat exchanger and the target temperature T, namely △ T2 is T2-T;
the heating capacity is corrected by adjusting a third control valve according to the positive and negative values and the size of △ T3, wherein △ T3 is calculated according to the difference between the temperature T3 of fresh air entering a room and a target temperature T, namely △ T3 is T3-T;
and finishing the adjustment.
12. The method for accurately controlling fresh air temperature and humidity according to claim 8; the method is characterized in that in the step S25, the step of entering the refrigeration mode to control and adjust the fresh air temperature and humidity specifically comprises the following steps:
preliminarily setting the operating frequency of the compressor according to the size of | △ T ' |, wherein △ T ' is calculated by the difference between the dew point temperature T ' of the fresh air inlet and the target temperature T, namely △ T ' ═ T ' -T;
the running frequency of the compressor is corrected through the positive and negative values and the size of △ T1, wherein △ T1 is calculated through the difference between the temperature T1 of fresh air entering the waste heat economizer and a target temperature T, namely △ T1-T1-T;
setting the preliminary humidification quantity through △ N and the rotating speed of a fresh air fan;
the humidification quantity is corrected through the positive and negative values and the size of △ N2, wherein △ N2 is calculated through the difference between the relative humidity N2 of fresh air entering the fresh air end heat exchanger and the target relative humidity N, namely △ N2 is N2-N;
the refrigerating capacity is corrected by adjusting a second control valve through the positive and negative values and the size of △ T2, wherein △ T2 is calculated through the difference between the temperature T2 of fresh air entering the fresh air end heat exchanger and a target temperature T, namely △ T2 is T2-T;
the refrigerating capacity is corrected by adjusting a third control valve through the positive and negative values and the size of △ T3, wherein △ T3 is calculated through the difference between the temperature T3 of fresh air entering the room and the target temperature T, namely △ T3 is T3-T;
and finishing the adjustment.
13. The method for accurately controlling fresh air temperature and humidity according to claim 9, wherein the step of correcting the operating frequency of the compressor through the positive and negative values and the size of △ T1 specifically comprises the following steps:
if △ T1 is positive, then the compressor frequency is decreased;
if △ T1 is negative, the correction frequency increases based on the original frequency, | △ T1| is larger.
14. The method for accurately controlling the temperature and humidity of fresh air according to claim 9, wherein the step of correcting the humidification amount through the positive and negative values and the size of △ N2 specifically comprises the following steps:
if △ N2 is positive, the humidifier is turned off;
if △ N2 is negative, the amount of humidification increases in addition to the original amount of humidification, | △ N2| is larger, and the corrected amount of humidification is higher.
15. The method for accurately controlling the temperature and humidity of fresh air according to claim 9, wherein the step of correcting the heating capacity by adjusting the second control valve through the positive and negative values and the size of △ T2 specifically comprises the steps of:
if △ T2 is positive, decreasing the second control valve opening;
if △ T2 is negative, the second control valve opening is increased.
16. The method for accurately controlling the temperature and humidity of fresh air according to claim 9, wherein the step of correcting the heating capacity by adjusting the third control valve through the positive and negative values and the size of △ T3 specifically comprises the steps of:
if △ T3 is positive, then the third control valve opening is decreased;
if △ T3 is negative, the third control valve opening is increased.
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