CN106152285B - Air conditioning system and control method thereof - Google Patents
Air conditioning system and control method thereof Download PDFInfo
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- CN106152285B CN106152285B CN201610675146.5A CN201610675146A CN106152285B CN 106152285 B CN106152285 B CN 106152285B CN 201610675146 A CN201610675146 A CN 201610675146A CN 106152285 B CN106152285 B CN 106152285B
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 192
- 239000003507 refrigerant Substances 0.000 claims abstract description 142
- 230000001105 regulatory effect Effects 0.000 claims description 46
- 238000010438 heat treatment Methods 0.000 claims description 27
- 238000005057 refrigeration Methods 0.000 claims description 25
- 238000001816 cooling Methods 0.000 claims description 20
- 230000001276 controlling effect Effects 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 8
- 230000003247 decreasing effect Effects 0.000 claims description 5
- 230000004044 response Effects 0.000 claims description 2
- 238000007791 dehumidification Methods 0.000 abstract description 7
- 230000009467 reduction Effects 0.000 description 4
- 238000005485 electric heating Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
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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
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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
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioning system and a control method thereof. The air conditioning system includes: a first refrigerant system including an evaporator; the water system comprises a first heat exchanger and a second heat exchanger, the first heat exchanger is arranged on the air outlet side of the evaporator, and the first heat exchanger is connected with a first heat exchange channel of the second heat exchanger; the second refrigerant system comprises a compressor A, and the output end of the compressor A is connected with a second heat exchange channel of the second heat exchanger; the humidifier is arranged on the air outlet side of the first heat exchanger. According to the invention, through different combinations of the water system, the second refrigerant system and the humidifier, the temperature rise/drop and/or the humidification/dehumidification of the air are realized, so that the temperature and the humidity can be rapidly and accurately treated under different working conditions, the temperature and humidity compensation is reduced, and the energy loss is reduced.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to an air conditioning system and a control method thereof.
Background
In the constant temperature and humidity air conditioning system in the prior art, air is cooled and dehumidified through an evaporator, and temperature and humidity compensation is performed through an electric heater and a humidifier after the air reaches a low-temperature and low-humidity state, so that temperature and humidity control is realized. This is because: because the evaporator has the functions of cooling and dehumidifying at the same time, in the environment requiring cooling and dehumidifying, when the indoor temperature is reduced to the set temperature, the humidity may still be higher. At this time, the temperature and humidity are continuously reduced to ensure the humidity requirement, and the excessively low temperature is compensated by electric heating. Similarly, in an environment requiring cooling, humidification or constant humidity cooling, the humidity is reduced when the temperature is lowered by the evaporator, and the too low humidity is compensated by the humidifier.
Therefore, the mode of adopting the electric heater and the humidifier to offset excessive refrigerating capacity and dehumidifying capacity in the prior art can generate larger energy consumption, and the electric heater is generally regulated in a grading way, so that the control precision is lower. In addition, a constant-temperature constant-humidity air conditioning system in the prior art generally adopts a fixed-frequency compressor, and the constant-temperature constant-humidity air conditioning system can be frequently started and stopped in the running process, has poor load adaptability, is easy to fluctuate in temperature and humidity and has low control precision.
Disclosure of Invention
The embodiment of the invention provides an air conditioning system and a control method thereof, which are used for solving the problems that the prior art can only cool and dehumidify through an evaporator, and then an electric heater and a humidifier are adopted to offset excessive refrigerating capacity and dehumidifying capacity, so that the energy consumption is high.
To achieve the above object, an embodiment of the present invention provides an air conditioning system, including: a first refrigerant system including an evaporator; the water system comprises a first heat exchanger and a second heat exchanger, the first heat exchanger is arranged on the air outlet side of the evaporator, and the first heat exchanger is connected with a first heat exchange channel of the second heat exchanger; the second refrigerant system comprises a compressor A, and the output end of the compressor A is connected with a second heat exchange channel of the second heat exchanger; the humidifier is arranged on the air outlet side of the first heat exchanger.
Preferably, the first refrigerant system further comprises a compressor B and a condenser a, wherein one end of the compressor B is connected with the other end of the compressor B sequentially through the evaporator and the condenser a.
Preferably, the second refrigerant system further comprises a four-way valve and a condenser B, wherein a first end of the four-way valve is connected with a second end of the four-way valve through the compressor A, and a third end of the four-way valve is connected with a fourth end of the four-way valve through the second heat exchange channel and the condenser B in sequence.
Preferably, the air conditioning system further comprises: the temperature and humidity sensor is arranged at the evaporator of the first refrigerant system and used for detecting the real-time temperature and humidity of return air of the evaporator; and the controller is connected with the temperature and humidity sensor and is used for controlling the operation of the first refrigerant system and/or the water system and/or the second refrigerant system according to the magnitude relation between the real-time temperature and humidity and the target temperature and humidity measured by the temperature and humidity sensor.
Preferably, the air conditioning system further comprises: the water temperature sensor is connected with the controller and used for detecting the water temperature of the water system; and the controller controls the refrigeration of the second refrigerant system according to the water temperature so that the water temperature in the first heat exchanger is higher than the dew point temperature of return air.
Preferably, the water system further comprises a water pump, a water tank for supplying water to the water system, and a regulating valve for regulating the flow of the first heat exchange channel, wherein the first heat exchanger is connected with the second heat exchanger through the water pump, one end of the regulating valve is connected with one end of the first heat exchange channel, and the other end of the regulating valve is connected with the other end of the first heat exchange channel.
Preferably, a throttle valve is provided on the pipeline of the first refrigerant system and/or the second refrigerant system.
Preferably, the compressor a and the compressor B are variable frequency compressors.
The invention also provides a control method of the air conditioning system, which is characterized by comprising the following steps: providing the air conditioning system; acquiring real-time temperature and humidity of return air of an evaporator of a first refrigerant system; and controlling the operation of the first refrigerant system and/or the water system and/or the second refrigerant system and/or the humidifier according to the size relation between the real-time temperature and the target temperature.
Preferably, if the real-time temperature of the return air of the evaporator is higher than the target temperature and the real-time humidity is higher than the target humidity, the first refrigerant system is controlled to start refrigeration.
Preferably, if the real-time humidity reaches the target humidity first, but the real-time temperature is still higher than the target temperature, the humidifier of the air conditioning system is started to humidify while the temperature is reduced and dehumidified through the first refrigerant system.
Preferably, if the real-time temperature and humidity and the target temperature and humidity meet the following conditions: the method comprises the steps that when the real-time temperature reaches the target temperature, but the real-time humidity is higher than the target humidity, or when the real-time temperature is lower than or equal to the target temperature, but the real-time humidity is higher than the target humidity, a first refrigerant system, a water system and a second refrigerant system are started at the same time, wherein the first refrigerant system is a refrigeration cycle, and the second refrigerant system is a heating cycle; the air is cooled and dehumidified by the evaporator and then is subjected to the constant temperature and constant temperature by the first heat exchanger.
Preferably, if the real-time temperature is lower than the target temperature and the real-time humidity is equal to the target humidity, starting a water system and a second refrigerant system, wherein the second refrigerant system is a heating cycle; the air is subjected to equal humidity temperature rise through the first heat exchanger.
Preferably, if the real-time temperature is lower than the target temperature and the real-time humidity is lower than the target humidity, the water system, the humidifier and the second refrigerant system are simultaneously started, wherein the second refrigerant system is a heating cycle; the air at the output side of the evaporator is subjected to isothermal heating through the first heat exchanger and then isothermal humidification through the humidifier.
Preferably, if the real-time temperature is equal to the target temperature and the real-time humidity is lower than the target humidity, the humidifier is started to perform isothermal humidification.
Preferably, if the real-time temperature is higher than the target temperature and the real-time humidity is lower than the target humidity, the water system, the humidifier and the second refrigerant system are simultaneously started, wherein the second refrigerant system is a refrigeration cycle; the air at the output side of the evaporator is subjected to isothermal cooling through the first heat exchanger and isothermal humidification through the humidifier, and the refrigeration of the second refrigerant system is controlled according to the water temperature of the water system in the process so that the water temperature in the first heat exchanger is higher than the dew point temperature of return air.
Preferably, if the real-time temperature is higher than the target temperature and the real-time humidity is equal to the target humidity, the water system and the second refrigerant system are started at the same time, wherein the second refrigerant system is a refrigeration cycle; the air at the output side of the evaporator is subjected to constant-humidity cooling through the first heat exchanger, and in the process, the refrigeration of the second refrigerant system is controlled according to the water temperature of the water system so that the water temperature in the first heat exchanger is higher than the dew point temperature of return air.
Preferably, if the real-time temperature reaches the target temperature while the real-time humidity reaches the target humidity, the operation state of the air conditioning system is maintained unchanged.
Preferably, after the second refrigerant system and the water system reach the target temperature, the temperature fluctuation caused by the change of the room load is responded by adjusting the water mixing temperature of the water system.
Preferably, the temperature fluctuation in response to the room load change by adjusting the mixing water temperature of the water system includes: setting a regulating valve connected with the second heat exchanger in parallel; and adjusting the water temperature of the mixed water by adjusting the flow of the adjusting valve.
Preferably, adjusting the mixed water temperature by adjusting the flow rate of the adjusting valve includes: when the second refrigerant system is in a refrigerating operation state, the water temperature of the mixed water is increased by increasing the flow of the regulating valve or the water temperature of the mixed water is reduced by decreasing the flow of the regulating valve; when the second refrigerant system is in a heating running state, the water temperature of the mixed water is reduced by increasing the flow of the regulating valve or is increased by reducing the flow of the regulating valve.
Preferably, when the real-time temperature is not maintained stably by adjusting the temperature of the mixed water of the water system, the real-time temperature is maintained stably by adjusting the control of the second refrigerant system.
According to the invention, the water temperature of the water system can be regulated by the second refrigerant system, so that the temperature of air output by the first refrigerant system is heated or cooled through the water system, and the humidity of air outlet can be regulated through the humidifier, so that the temperature of air can be heated/cooled and/or humidified/dehumidified through different combinations of the water system, the second refrigerant system and the humidifier, and the temperature and humidity can be rapidly and accurately treated under different working conditions, thereby reducing temperature and humidity compensation and reducing energy loss.
Drawings
Fig. 1 is a schematic structural view of an air conditioning system according to an embodiment of the present invention.
Reference numerals illustrate: 1. an evaporator; 2. a first heat exchanger; 3. a second heat exchanger; 4. a compressor A; 5. a humidifier; 6. a compressor B; 7. a condenser A; 8. a four-way valve; 9. a condenser B; 10. a temperature and humidity sensor; 11. a water temperature sensor; 12. a water tank; 13. a regulating valve; 14. a throttle valve; 15. and (3) a water pump.
Detailed Description
The invention will now be described in further detail with reference to the drawings and specific examples, which are not intended to limit the invention thereto.
The invention provides an air conditioning system which is provided with two refrigerant systems, a water system and a humidifier, wherein the temperature rising/reducing and/or humidifying/dehumidifying treatment of the air is realized by using different combinations of the elements, so that the temperature and the humidity can be rapidly and accurately treated under different working conditions, the temperature and the humidity can be reduced, the temperature and the humidity can be compensated, and the energy loss can be reduced.
As shown in fig. 1, the air conditioning system of the present invention includes a first refrigerant system, a water system, a second refrigerant system, and a humidifier. Wherein, the first refrigerant system and the second refrigerant system can be fluorine systems.
Referring to fig. 1, the first refrigerant system of the present invention includes an evaporator 1, a compressor B6 and a condenser A7, wherein the compressor B6, the evaporator 1 and the condenser A7 are sequentially connected in series, and when indoor air flows into the evaporator 1 in the arrow direction shown in fig. 1, the evaporator 1 can be used to cool and dehumidify the flowing air. The first refrigerant system can adjust the refrigerating capacity or the dehumidifying capacity according to different conditions, and the temperature of the refrigerant in the evaporator 1 is lower than the dew point temperature of return air, and the main function of the first refrigerant system is cooling and dehumidifying.
The water system is arranged on the output side of the first refrigerant system, wherein the water system comprises two heat exchangers, a first heat exchanger 2 and a second heat exchanger 3. Wherein the first heat exchanger 2 is disposed at the air outlet side of the evaporator 1, and air flowing out of the evaporator 1 is blown into the first heat exchanger 2, so that the air flowing therein can be subjected to heating or cooling treatment by the first heat exchanger 2. Furthermore, the second heat exchanger 3 has two heat exchange channels for heat exchange, namely a first heat exchange channel and a second heat exchange channel. The first heat exchanger 2 may be a surface air cooler.
The first heat exchanger 2 is connected to a first heat exchange channel of the second heat exchanger 3, and the second heat exchange channel is used for flowing the refrigerant from the second refrigerant system, so that the second heat exchange channel can be used for performing heat exchange with the liquid medium (such as water) in the first heat exchange channel, thereby changing the water temperature flowing in the water system. For example, the water in the water system may be heated or cooled and circulated in the water system by the water pump 15 or the like, so that the air may be subjected to a temperature raising or lowering treatment by the first heat exchanger 2.
Referring to fig. 1, the second refrigerant system includes a compressor A4, and the compressor A4 can be used to realize a cooling or heating function, and the output refrigerant flows through the second heat exchange channel of the second heat exchanger 3 to adjust the water temperature of the water system through the second heat exchanger 3. Therefore, the invention can combine the second refrigerant system with the water system, and can more accurately control the water inlet temperature in the first heat exchanger to perform temperature compensation on air. The second refrigerant system can be operated in a refrigeration and/or heating cycle state, and when the second refrigerant system is used in combination with the water system, the second refrigerant system can perform equal-humidity cooling or equal-humidity heating on the air, wherein when the equal-humidity cooling is realized, the temperature of cold water in the first heat exchanger 2 can be higher than the dew point temperature of return air. Because the second refrigerant system adopts a heat pump system, compared with the electric heating in the prior art, the electric heating device is more energy-saving.
In addition, a humidifier 5 is provided on the output side of the first heat exchanger 2 to regulate the humidity of the air. The indoor air is treated by the evaporator 1, the first heat exchanger 2 and the humidifier 5 and then is sent into the room.
By adopting the technical scheme, the water temperature of the water system can be regulated by the second refrigerant system, so that the temperature of air output by the first refrigerant system is heated or cooled by the water system, the humidity of air outlet can be regulated by the humidifier, and the heating/cooling and/or humidifying/dehumidifying of the air can be realized by different combination of the water system, the second refrigerant system and the humidifier, so that the temperature and humidity can be rapidly and accurately treated under different working conditions, temperature and humidity compensation is reduced, energy loss is reduced, and the problems that in the prior art, excessive refrigerating capacity and dehumidifying capacity can be counteracted by adopting an electric heater and a humidifier are solved, and energy consumption is large are solved.
As shown in fig. 1, the second refrigerant system in the present invention further includes a four-way valve 8 and a condenser B9, wherein a first end of the four-way valve 8 is connected to a second end of the four-way valve 8 through a compressor A4, and a third end of the four-way valve 8 is connected to a fourth end of the four-way valve 8 through a second heat exchange channel and the condenser B9 in sequence, and the working principle thereof is the same as the refrigeration and heating principle of the refrigerant system in the present invention shown in the prior art, and will not be described herein. Unlike the prior art, the present invention utilizes the refrigerant of the second refrigerant system to flow through the second heat exchanger 3, thereby providing heating or cooling energy to the water system.
In order to obtain the temperature and humidity of the air, the invention also installs a temperature and humidity sensor 10 at the evaporator 1 of the first refrigerant system, and can detect the real-time temperature and humidity of the return air of the evaporator 1, namely the real-time temperature and the real-time humidity. In addition, the invention further comprises a controller connected with the temperature and humidity sensor 10, which can control the operation of the first refrigerant system and/or the water system and/or the second refrigerant system and/or the humidifier according to the magnitude relation between the real-time temperature and humidity measured by the temperature and humidity sensor 10 and the target temperature and humidity, so as to realize the combined operation of the water system, the humidifier and the second refrigerant system. Wherein, the controller can be realized by adopting a singlechip, a PLC and the like in the prior art.
In a more preferred embodiment, the invention also comprises a water temperature sensor 11 which can detect the water temperature of the water system, so that the controller can control the refrigeration of the second refrigerant system according to the water temperature which is not available, and the water temperature in the first heat exchanger 2 is higher than the dew point temperature of the return air.
As shown in fig. 1, the water system further comprises a water tank 12 (preferably an expansion water tank) and a regulating valve 13, wherein the water tank 12 supplies water to the water system, and circulating water in the whole water system is formed by mixing water flowing through a branch where the regulating valve 13 is located with water flowing through the second heat exchanger, so that the mixing ratio of the water system can be regulated through the regulating valve 13, and the purpose of fine-tuning the water temperature of the water system is achieved. In the embodiment shown in fig. 1, the first heat exchanger 2 is connected to the second heat exchanger 3 by a water pump 15, and one end of the regulating valve 13 is connected to one end of the first heat exchanging channel, and the other end is connected to the other end of the first heat exchanging channel. The water flowing into the first heat exchanger 2 is the flow rate of the hydration flow of the branch where the regulating valve 13 is located and the branch where the first heat exchange channel is located, so that fine adjustment of the water temperature can be realized through the regulating valve 13.
Thus, when the temperature reaches the target temperature, the inlet water temperature of the first heat exchanger 2 can be finely adjusted by changing the opening of the regulating valve 13, so that the temperature fluctuation caused by the room load change and the like can be responded quickly, and the temperature control precision is improved.
More preferably, the present invention further provides a throttle valve 14 on the pipeline of the first refrigerant system and/or the second refrigerant system, respectively.
The conventional systems in the prior art mostly adopt fixed-frequency compressors, and are poor in load adaptability, easy to fluctuate in temperature and humidity and low in control accuracy because of frequent start and stop in the running process. Therefore, the compressor A4 and the compressor B6 in the invention are preferably variable frequency compressors, so that the refrigerating capacity, the dehumidifying capacity and the heating capacity can be adjusted steplessly according to different conditions, the control precision is improved, and the stability of temperature and humidity is enhanced.
The invention also provides a control method of the air conditioning system, which is used for controlling the air conditioning system.
In order to realize the control of the air conditioning system, the invention firstly obtains the real-time temperature and humidity of the return air of the evaporator 1 of the first refrigerant system, and then can control the operation of the first refrigerant system and/or the water system and/or the second refrigerant system according to the magnitude relation between the real-time temperature and humidity and the target temperature and humidity. The real-time temperature and humidity is the temperature of the indoor environment, and can be detected by a temperature and humidity sensor. In one embodiment, the real-time humidity is a calculated humidity value that is calculated based on the temperature of the return air and the relative humidity, and can be understood as absolute humidity.
Therefore, in the using process of the constant temperature and humidity air conditioning system, the control unit can calculate the target humidity according to the set target temperature and relative humidity, and then calculate the moisture content and the dew point temperature according to the detected return air temperature and relative humidity, so that corresponding control can be performed.
The following describes in detail how the operation of the first refrigerant system and/or the water system and/or the second refrigerant system is controlled according to the magnitude relation between the real-time temperature and the target temperature and humidity according to different working conditions.
(1) And if the real-time temperature of the return air of the evaporator 1 is higher than the target temperature and the real-time humidity is higher than the target humidity, controlling the first refrigerant system to start refrigeration. At this time, the refrigerant absorbs heat by evaporation in the evaporator 1, and the air passes through the evaporator 1 and is cooled and dehumidified.
(2) If the real-time humidity reaches the target humidity first, but the real-time temperature is still higher than the target temperature, the temperature reduction and dehumidification are needed to be continued, and the humidifier 5 of the air conditioning system is started to humidify while the temperature reduction and dehumidification are carried out through the first refrigerant system.
At this time, the variable frequency compressor in the first refrigerant system is adjusted according to the target temperature, for example, the operating frequency of the compressor is changed, so that the temperature (humidity) reaches the corresponding target value more quickly, the fluctuation of the temperature (humidity) is reduced, and the control precision is improved. More specifically, the higher the frequency of the compressor, the greater the amount of refrigeration or heating or dehumidification is provided; the lower the frequency, the less refrigeration or heating or dehumidification is provided. When the difference between the detected temperature (humidity) and the target temperature (humidity) is large, the control is preferably performed at a high frequency to speed up the adjustment, and the control is performed gradually at a low frequency as the difference is reduced, and the low frequency is maintained when the target value is reached, so that the temperature (humidity) fluctuation is reduced, and the control accuracy is improved.
In addition, the humidifier 5 adjusts according to the target humidity, and remains stable after the temperature and humidity reach the target value.
(3) If the real-time temperature and the target temperature and humidity meet the requirements that (a) the real-time temperature reaches the target temperature and the real-time humidity is higher than the target humidity (isothermal dehumidification is needed at the moment), or (b) the real-time temperature is lower than or equal to the target temperature and the real-time humidity is higher than the target humidity (heating dehumidification is needed at the moment), a first refrigerant system, a water system and a second refrigerant system are simultaneously started, wherein the first refrigerant system is a refrigeration cycle, the refrigerant absorbs heat through evaporation in the evaporator 1, and the second refrigerant system is a heating cycle, and the refrigerant condenses in the second heat exchanger to release heat. During control, the air is cooled and dehumidified by the evaporator 1 and then subjected to the first heat exchanger 2 and the like to be wet and heated.
In this way, circulating water in the water system absorbs heat in the second heat exchanger, and then flows into the first heat exchanger through the water pump to release heat; the air is cooled and dehumidified after passing through the evaporator 1, and then subjected to constant humidity and temperature rise through the first heat exchanger. At this time, the variable frequency compressor of the first refrigerant system is adjusted according to the target humidity, and the variable frequency compressor of the second refrigerant system is adjusted according to the target temperature, and the temperature and humidity reach the target value and then remain stable.
In another case, if the real-time temperature is lower than the target temperature and the real-time humidity is equal to the target humidity, starting a water system and a second refrigerant system, wherein the second refrigerant system is a heating cycle; the air is subjected to an equal wet temperature rise through the first heat exchanger 2.
(4) If the real-time temperature is lower than the target temperature and the real-time humidity is lower than the target humidity, the air conditioner needs to heat and humidify at the moment, so that the water system, the humidifier 5 and the second refrigerant system are simultaneously started, wherein the second refrigerant system is a heating cycle; the air at the output side of the evaporator 1 is subjected to isothermal heating by the first heat exchanger 2 and then isothermal humidification by the humidifier 5.
At this time, the circulating water in the water system absorbs heat in the second heat exchanger, and then flows into the first heat exchanger through the water pump to release heat. The air is subjected to constant temperature rising through the first heat exchanger and then isothermal humidification through the humidifier 5. The variable frequency compressor of the second refrigerant system is adjusted according to the target temperature, the humidifier 5 is adjusted according to the target humidity, and the temperature and the humidity reach the target value and then remain stable.
(5) If the real-time temperature is equal to the target temperature and the real-time humidity is lower than the target humidity, the air conditioner needs isothermal humidification, and the humidifier 5 is started to perform isothermal humidification. At this time, the humidifier 5 is operated and adjusted according to the target humidity, and the air is isothermally humidified by the humidifier 5 and is stabilized after reaching the target value.
(6) If the real-time temperature is higher than the target temperature and the real-time humidity is lower than the target humidity, the air conditioner needs to be cooled and humidified, and then the water system, the humidifier and a second refrigerant system are started at the same time, wherein the second refrigerant system is a refrigeration cycle; the air at the output side of the evaporator 1 is subjected to constant temperature reduction through the first heat exchanger 2, then subjected to constant temperature humidification through the humidifier 5, and the refrigeration of the second refrigerant system is controlled according to the water temperature of the water system in the process so that the water temperature in the first heat exchanger 2 is higher than the dew point temperature of return air.
At this time, the circulating water in the water system releases heat in the second heat exchanger, and then flows into the first heat exchanger through the water pump to absorb heat. The variable frequency compressor of the second refrigerant system is regulated according to the target temperature, and the temperature of cold water in the first heat exchanger is controlled to be higher than the dew point temperature of return air according to the detected water temperature of the water temperature sensor 11, so that the air is subjected to constant humidity cooling through the first heat exchanger, isothermal humidification through the humidifier 5, and the temperature and the humidity are maintained to be stable after reaching the target value.
(7) If the real-time temperature is higher than the target temperature and the real-time humidity is equal to the target humidity, the air conditioner needs to wait for the temperature reduction, and then the water system and a second refrigerant system are started at the same time, wherein the second refrigerant system is a refrigeration cycle; the air at the output side of the evaporator 1 is subjected to constant humidity cooling through the first heat exchanger 2, and in the process, the refrigeration of the second refrigerant system is controlled according to the water temperature of the water system so that the water temperature in the first heat exchanger 2 is higher than the dew point temperature of return air.
At this time, the circulating water in the water system releases heat in the second heat exchanger, and then flows into the first heat exchanger through the water pump to absorb heat. The variable frequency compressor of the second refrigerant system not only adjusts according to the target temperature, but also controls the temperature of cold water in the first heat exchanger to be higher than the dew point temperature of return air according to the water temperature detected by the water temperature sensor 11, so that the air is subjected to constant humidity cooling through the first heat exchanger, and the air is kept stable after reaching the target value.
(8) If the real-time temperature reaches the target temperature and the real-time humidity reaches the target humidity, the running state of the whole air conditioning system is maintained unchanged.
Further, after the second refrigerant system and the water system make the real-time temperature reach the target temperature, in order to quickly respond to the temperature fluctuation caused by the room load change and the like, the invention can quickly finely adjust the water mixing temperature of the water system (namely, adjust the opening of the adjusting valve 13) so as to quickly respond to the temperature fluctuation caused by the room load change. For this purpose, the invention provides a regulating valve 13 in parallel with the second heat exchanger 3 in the air conditioning system to regulate the temperature of the mixed water by regulating the flow of the regulating valve 13.
More specifically, when the second refrigerant system is in the cooling operation state, the mixed water temperature is increased by increasing the flow rate of the regulating valve 13, or the mixed water temperature is decreased by decreasing the flow rate of the regulating valve 13; when the second refrigerant system is in the heating operation state, the mixed water temperature is reduced by increasing the flow of the regulating valve 13, or the mixed water temperature is increased by decreasing the flow of the regulating valve 13.
That is, if the second refrigerant system is in the cooling mode, when the inlet water temperature of the first heat exchanger needs to be increased, the opening of the regulating valve 13 is increased, the return water is increased, and the water temperature after mixing is increased; when the water inlet temperature of the first heat exchanger needs to be reduced, the opening of the regulating valve 13 is reduced, the backwater is reduced, and the water temperature after mixing is reduced. If the second refrigerant system is in a heating mode, when the water inlet temperature of the first heat exchanger needs to be reduced, the opening of the regulating valve 13 is increased, the backwater is increased, and the water temperature after mixing is reduced; when the water inlet temperature of the first heat exchanger needs to be increased, the opening of the regulating valve 13 is reduced, the backwater is reduced, and the water temperature after mixing is increased. Of course, in order to reduce the cost, the invention can eliminate the regulating valve 13, so that when the temperature fluctuation is caused by the room load change, the frequency conversion compressor of the second refrigerant system can correspondingly regulate.
Preferably, when the real-time temperature can not be maintained stably by adjusting the water temperature of the mixed water of the water system, the real-time temperature is maintained stable by controlling and adjusting the variable frequency compressor of the second refrigerant system.
Of course, the above is a preferred embodiment of the present invention. It should be noted that it will be apparent to those skilled in the art that several modifications and adaptations can be made without departing from the general principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (19)
1. An air conditioning system, comprising:
a first refrigerant system including an evaporator (1);
the water system comprises a first heat exchanger (2) and a second heat exchanger (3), wherein the first heat exchanger (2) is arranged on the air outlet side of the evaporator (1), and the first heat exchanger (2) is connected with a first heat exchange channel of the second heat exchanger (3);
the second refrigerant system comprises a compressor A (4), and the output end of the compressor A (4) is connected with a second heat exchange channel of the second heat exchanger (3);
the humidifier (5) is arranged on the air outlet side of the first heat exchanger (2);
the first refrigerant system further comprises a compressor B (6) and a condenser A (7), wherein one end of the compressor B (6) is connected with the other end of the compressor B (6) sequentially through the evaporator (1) and the condenser A (7);
the second refrigerant system further comprises a four-way valve (8) and a condenser B (9), wherein a first end of the four-way valve (8) is connected with a second end of the four-way valve (8) through the compressor A (4), and a third end of the four-way valve (8) is connected with a fourth end of the four-way valve (8) through the second heat exchange channel and the condenser B (9) in sequence;
the air conditioning system further includes:
the temperature and humidity sensor (10) is arranged at the evaporator (1) of the first refrigerant system and is used for detecting the real-time temperature and humidity of return air of the evaporator (1);
the controller is connected with the temperature and humidity sensor (10) and is used for controlling the operation of the first refrigerant system and/or the water system and/or the second refrigerant system according to the magnitude relation between the real-time temperature and humidity measured by the temperature and humidity sensor (10) and the target temperature and humidity;
and one end of the regulating valve (13) is connected with one end of the first heat exchange channel, and the other end of the regulating valve is connected with the other end of the first heat exchange channel.
2. The air conditioning system of claim 1, further comprising:
a water temperature sensor (11) connected to the controller for detecting the water temperature of the water system; the controller controls the refrigeration of the second refrigerant system according to the water temperature so that the water temperature in the first heat exchanger (2) is higher than the dew point temperature of return air.
3. An air conditioning system according to claim 1, characterized in that the water system further comprises a water pump (15) and a water tank (12) for supplying water to the water system, the first heat exchanger (2) being connected to the second heat exchanger (3) by means of the water pump (15).
4. Air conditioning system according to claim 1, characterized in that a throttle valve (14) is provided on the line of the first refrigerant system and/or the second refrigerant system.
5. An air conditioning system according to claim 1, characterized in that the compressor a (4) and the compressor B (6) are both variable frequency compressors.
6. A control method of an air conditioning system, comprising:
providing the air conditioning system of claim 1;
acquiring real-time temperature and humidity of return air of an evaporator (1) of a first refrigerant system;
and controlling the operation of the first refrigerant system and/or the water system and/or the second refrigerant system and/or the humidifier according to the size relation between the real-time temperature and the target temperature.
7. The method for controlling an air conditioning system according to claim 6, wherein,
and if the real-time temperature of the return air of the evaporator (1) is higher than the target temperature and the real-time humidity is higher than the target humidity, controlling the first refrigerant system to start refrigeration.
8. The method for controlling an air conditioning system according to claim 6, wherein,
if the real-time humidity reaches the target humidity first, but the real-time temperature is still higher than the target temperature, the humidifier (5) of the air conditioning system is started to humidify while the temperature is reduced and dehumidified through the first refrigerant system.
9. The method for controlling an air conditioning system according to claim 6, wherein,
if the real-time temperature and humidity and the target temperature and humidity meet the following conditions:
(a) The real-time temperature reaches the target temperature, but the real-time humidity is higher than the target humidity, or
(b) The real-time temperature is lower than or equal to the target temperature but the real-time humidity is higher than the target humidity,
simultaneously starting a first refrigerant system, a water system and a second refrigerant system, wherein the first refrigerant system is a refrigeration cycle, and the second refrigerant system is a heating cycle;
the air is cooled and dehumidified by the evaporator (1) and then subjected to the constant humidity temperature rise by the first heat exchanger (2).
10. The method for controlling an air conditioning system according to claim 6, wherein,
if the real-time temperature is lower than the target temperature and the real-time humidity is equal to the target humidity, starting a water system and a second refrigerant system, wherein the second refrigerant system is a heating cycle;
the air is subjected to constant temperature rise through the first heat exchanger (2).
11. The method for controlling an air conditioning system according to claim 6, wherein,
if the real-time temperature is lower than the target temperature and the real-time humidity is lower than the target humidity, simultaneously starting a water system, a humidifier (5) and a second refrigerant system, wherein the second refrigerant system is a heating cycle;
the air at the output side of the evaporator (1) is subjected to isothermal heating through the first heat exchanger (2) and then isothermal humidification through the humidifier (5).
12. The method for controlling an air conditioning system according to claim 6, wherein,
and if the real-time temperature is equal to the target temperature and the real-time humidity is lower than the target humidity, starting the humidifier (5) to carry out isothermal humidification.
13. The method for controlling an air conditioning system according to claim 6, wherein,
if the real-time temperature is higher than the target temperature and the real-time humidity is lower than the target humidity, simultaneously starting a water system, a humidifier and a second refrigerant system, wherein the second refrigerant system is a refrigeration cycle;
the air at the output side of the evaporator (1) is subjected to isothermal cooling through the first heat exchanger (2) and isothermal humidification through the humidifier (5), and the refrigeration of the second refrigerant system is controlled according to the water temperature of the water system in the process, so that the water temperature in the first heat exchanger (2) is higher than the dew point temperature of return air.
14. The method for controlling an air conditioning system according to claim 6, wherein,
if the real-time temperature is higher than the target temperature and the real-time humidity is equal to the target humidity, simultaneously starting a water system and a second refrigerant system, wherein the second refrigerant system is a refrigeration cycle;
the air at the output side of the evaporator (1) is subjected to constant humidity cooling through the first heat exchanger (2), and in the process, the refrigeration of the second refrigerant system is controlled according to the water temperature of the water system so that the water temperature in the first heat exchanger (2) is higher than the dew point temperature of return air.
15. The control method of an air conditioning system according to claim 6, wherein if the real-time temperature reaches the target temperature while the real-time humidity reaches the target humidity, the operation state of the air conditioning system is maintained unchanged.
16. The method for controlling an air conditioning system according to any one of claims 7, 10, 13 or 14, wherein,
and after the second refrigerant system and the water system enable the real-time temperature to reach the target temperature, the temperature fluctuation caused by room load change is responded by adjusting the water mixing temperature of the water system.
17. The control method of an air conditioning system according to claim 16, wherein the temperature fluctuation in response to the room load change by adjusting the water temperature of the mixed water of the water system includes:
-providing a regulating valve (13) connected in parallel with said second heat exchanger (3);
the water temperature of the mixed water is regulated by regulating the flow of the regulating valve (13).
18. The control method of an air conditioning system according to claim 17, characterized in that adjusting the water temperature of the mixed water by adjusting the flow rate of the adjusting valve (13) includes:
when the second refrigerant system is in a refrigerating operation state, the water temperature of the mixed water is increased by increasing the flow of the regulating valve (13) or the water temperature of the mixed water is reduced by decreasing the flow of the regulating valve (13);
when the second refrigerant system is in a heating operation state, the water temperature of the mixed water is reduced by increasing the flow of the regulating valve (13), or the water temperature of the mixed water is increased by reducing the flow of the regulating valve (13).
19. The method according to claim 16, wherein when the real-time temperature is not maintained stably by adjusting the temperature of the mixed water of the water system, the real-time temperature is maintained stably by adjusting the control of the second refrigerant system.
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| EP3967945B1 (en) * | 2019-06-26 | 2023-07-26 | Daikin Industries, Ltd. | Air conditioning system |
| CN111059735B (en) * | 2019-12-03 | 2021-03-23 | 珠海格力电器股份有限公司 | Air treatment equipment and control method, device and controller thereof |
| CN114279002B (en) * | 2021-12-21 | 2022-11-25 | 珠海格力电器股份有限公司 | Air conditioning device, control method and combined air conditioning unit |
| CN114294903B (en) * | 2021-12-31 | 2024-09-20 | 海信冰箱有限公司 | Constant temperature and humidity device |
| CN115258189B (en) * | 2022-08-29 | 2024-06-04 | 中国人民解放军海军航空大学 | Temperature compensation adjusting method and system for centralized aircraft air conditioning equipment |
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