CN115218466B - Fresh air constant temperature and humidity system and refrigerating method and heating method thereof - Google Patents
Fresh air constant temperature and humidity system and refrigerating method and heating method thereof Download PDFInfo
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- CN115218466B CN115218466B CN202210965843.XA CN202210965843A CN115218466B CN 115218466 B CN115218466 B CN 115218466B CN 202210965843 A CN202210965843 A CN 202210965843A CN 115218466 B CN115218466 B CN 115218466B
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000010438 heat treatment Methods 0.000 title claims abstract description 18
- 238000004378 air conditioning Methods 0.000 claims abstract description 39
- 238000001816 cooling Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000008569 process Effects 0.000 description 7
- 238000004422 calculation algorithm Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004590 computer program Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—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
- 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
- F24F11/67—Switching between heating and cooling modes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
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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
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
-
- 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
Abstract
The invention discloses a full fresh air constant temperature and humidity system, a refrigerating method and a heating method thereof, wherein the system comprises an air conditioning unit, a constant temperature and humidity chamber and a controller, the air conditioning unit comprises a shell, an air inlet and an air supply opening are respectively arranged at two ends of the shell, and an air inlet temperature and humidity sensor, a heat exchanger, a temperature sensor, an electric heater, a humidifier and an air supply temperature and humidity sensor are sequentially arranged from the air inlet to the air supply opening in the shell; a compressor is arranged outside the shell, and the compressor is connected to the heat exchanger through a pipeline; the air supply port is connected to the constant temperature and humidity chamber through a pipeline, and an exhaust temperature and humidity sensor is arranged at an exhaust position of the constant temperature and humidity chamber; the air inlet temperature and humidity sensor, the temperature sensor, the air supply temperature and humidity sensor, the air exhaust temperature and humidity sensor, the humidifier, the electric heater and the compressor are all connected to the controller through wires; the invention can solve the problems of energy saving failure and low control precision of the full fresh air constant temperature and humidity system.
Description
Technical Field
The invention relates to a full fresh air constant temperature and humidity system, and a refrigerating method and a heating method thereof, and belongs to the technical field of air conditioner control.
Background
The constant temperature and humidity air conditioner is mostly applied to occasions with particularly high requirements on temperature and humidity precision, such as places of electronic industry, instruments and meters, precision machinery, biological engineering, food and beverage, medicine and health and the like, and the temperature and humidity precision of the places directly influences the quality, storage and the like of products.
The control method of the full fresh air constant temperature and humidity system at present is that fresh air is dehumidified by reducing the temperature to the dew point temperature through an evaporator during refrigeration, then the temperature is increased to the indoor demand temperature through electric heating, and the fresh air is heated to the indoor demand temperature through a condenser during heating, and the humidifier is used for humidifying the fresh air humidity to the indoor demand humidity.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a fresh air constant temperature and humidity system, a refrigerating method and a heating method thereof, and solves the technical problems that the existing fresh air constant temperature and humidity system is not energy-saving and has low control precision.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
In a first aspect, the present invention provides a cooling method for a fresh air constant temperature and humidity system, where the fresh air constant temperature and humidity system includes an air conditioning unit and a constant temperature and humidity chamber that are connected through an air duct, and the cooling method includes:
Acquiring the air inlet humidity, the rear temperature of the evaporator coil and the air supply temperature of the air conditioning unit, and calculating the absolute moisture content of the air inlet according to the air inlet humidity;
acquiring set temperature and humidity and exhaust temperature of the constant temperature and humidity chamber, and calculating set absolute moisture content and set dew point temperature according to the set humidity;
And controlling the evaporator and the electric heater of the air conditioning unit according to the absolute moisture content of the inlet air, the rear temperature of the evaporator coil, the air supply temperature, the set temperature, the exhaust temperature, the set absolute moisture content and the set dew point temperature.
Optionally, the calculating the set absolute moisture content and the set dew point temperature according to the set humidity includes:
；
；
In the method, in the process of the invention, Is air pressure,/>Th is set humidity, d is set absolute moisture content,/>, for partial pressure of water vaporTo set the dew point temperature.
Optionally, the controlling of the evaporator of the air conditioning unit includes:
When the absolute moisture content d1 of the inlet air is larger than the set value Output capacity of evaporator/>The method comprises the following steps:
；
；
；
In the method, in the process of the invention, For the output capacity of the current evaporator,/>For the change in temperature TZ1 after the evaporator coil,/>To set dew point temperature,/>The temperature after the evaporator coil, d is the absolute moisture content;
when the absolute moisture content d1 of the inlet air is smaller than the set value Output capacity of evaporator/>The method comprises the following steps:
；
；
；
In the method, in the process of the invention, T3 is the exhaust temperature, which is the variation of the exhaust temperatureTo set temperature,/>Is a preset constant.
Optionally, the controlling of the air conditioning unit electric heater includes:
When the air supply temperature T2 is greater than the set value When the electric heater stops outputting;
When the air supply temperature T2 is smaller than the set value When the electric heater outputs normally;
when the air supply temperature T2 is less than or equal to the set value And is greater than or equal to the set value/>When the electric heater keeps the current output;
wherein, Is a preset constant.
In a second aspect, the invention provides a heating method of an all fresh air constant temperature and humidity system, the all fresh air constant temperature and humidity system comprises an air conditioning unit and a constant temperature and humidity chamber which are communicated through an air duct, and the heating method comprises the following steps:
Acquiring the air supply temperature and humidity of the air conditioning unit, and calculating the absolute moisture content of the air supply according to the air supply humidity;
acquiring a set temperature and humidity of a constant temperature and humidity chamber, and calculating a set absolute moisture content according to the set humidity;
And controlling the electric heater and the humidifier of the air conditioning unit according to the air supply temperature, the set temperature, the absolute air supply moisture content and the set absolute moisture content.
Optionally, the controlling of the humidifier of the air conditioning unit includes:
when the absolute moisture content d2 of the air supply is greater than a preset value When the humidifier stops outputting;
When the absolute moisture content d2 of the air supply is less than or equal to a preset value When the humidifier outputs normally;
wherein, Is a preset constant.
Optionally, the controlling of the electric heater of the air conditioning unit includes:
when the current output capacity of the condenser is less than 70% of rated output capacity or when the supply air temperature T2 is greater than a set value When the electric heater stops outputting;
when the current output capacity of the condenser is more than or equal to 70% of rated output capacity and the air supply temperature T2 is less than the set value When the electric heater outputs normally;
wherein, Is a preset constant.
In a third aspect, the invention provides a full fresh air constant temperature and humidity system, which comprises an air conditioning unit, a constant temperature and humidity chamber and a controller, wherein the air conditioning unit comprises a shell, an air inlet and an air supply opening are respectively arranged at two ends of the shell, and an air inlet temperature and humidity sensor, a heat exchanger, a temperature sensor, an electric heater, a humidifier and an air supply temperature and humidity sensor are sequentially arranged from the air inlet to the air supply opening in the shell; a compressor is arranged outside the shell, and the compressor is connected to the heat exchanger through a pipeline; the air supply port is connected to the constant temperature and humidity chamber through a pipeline, and an exhaust temperature and humidity sensor is arranged at an exhaust position of the constant temperature and humidity chamber; the air inlet temperature and humidity sensor, the temperature sensor, the air supply temperature and humidity sensor, the air exhaust temperature and humidity sensor, the humidifier, the electric heater and the compressor are all connected to the controller through wires; the controller is used for executing the steps of the refrigerating method of the fresh air constant temperature and humidity system or executing the heating method of the fresh air constant temperature and humidity system.
Optionally, a solid-state relay is further connected between the controller and the electric heater, contact ends of the solid-state relay are respectively connected to the mains supply and the electric heater, a control end of the solid-state relay is connected to the controller, and the controller controls the solid-state relay to continuously adjust the electric heater by adopting a PID algorithm.
Optionally, the compressor adopts an air injection enthalpy-increasing variable frequency scroll compressor.
Compared with the prior art, the invention has the beneficial effects that:
According to the fresh air constant temperature and humidity system, the refrigerating method and the heating method thereof, provided by the invention, the electric heater, the humidifier and the compressor are dynamically controlled by acquiring the sensing data of the air inlet temperature and humidity sensor, the temperature sensor, the air supply temperature and humidity sensor and the air exhaust temperature and humidity sensor, so that the problem that great energy waste is caused by the fact that the fresh air temperature is reduced to the dew point for dehumidification when the air inlet working condition is high in temperature and low in humidity in the running process of the fresh air constant temperature and humidity system can be solved; the problems of false heating, false humidification and the like caused by the delay of actions of the electric heater and the humidifier and the receiving signals of the sensor are solved; thereby improving the energy saving and control precision of the system.
Drawings
FIG. 1 is a flow chart of a refrigerating method of a fresh air constant temperature and humidity system according to an embodiment of the present invention;
FIG. 2 is a flow chart of a heating method of a fresh air constant temperature and humidity system according to a second embodiment of the present invention;
FIG. 3 is a schematic diagram of a full fresh air constant temperature and humidity system according to a third embodiment of the present invention;
Marked in the figure as:
1. an air conditioning unit, 11, a shell, 12, an air inlet, 13 and an air outlet,
101. An air inlet temperature and humidity sensor 102, a heat exchanger 103, a temperature sensor 104, an electric heater 105, a humidifier 106 and an air supply temperature and humidity sensor,
2. A constant temperature and humidity chamber, 21, an exhaust temperature and humidity sensor,
3. And a controller.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
Embodiment one:
as shown in fig. 1, the embodiment of the invention provides a refrigerating method of a fresh air constant temperature and humidity system, wherein the fresh air constant temperature and humidity system comprises an air conditioning unit and a constant temperature and humidity chamber which are communicated through an air duct, and the refrigerating method comprises the following steps:
S101, acquiring the air inlet humidity of an air conditioning unit, the rear temperature of an evaporator coil and the air supply temperature, and calculating the absolute moisture content of the air inlet according to the air inlet humidity;
S102, acquiring set temperature and humidity and exhaust temperature of a constant temperature and humidity chamber, and calculating set absolute moisture content and set dew point temperature according to the set humidity;
Calculation of absolute moisture content, taking calculation of set absolute moisture content and set dew point temperature as examples:
；
；
In the method, in the process of the invention, Is air pressure,/>Th is set humidity, d is set absolute moisture content,/>, for partial pressure of water vaporTo set the dew point temperature.
S103, controlling the evaporator and the electric heater of the air conditioning unit according to the absolute moisture content of the inlet air, the rear temperature of the evaporator coil, the air supply temperature, the set temperature, the exhaust temperature, the set absolute moisture content and the set dew point temperature.
(1) The control of the evaporator of the air conditioning unit comprises:
When the absolute moisture content d1 of the inlet air is larger than the set value Output capacity of evaporator/>The method comprises the following steps:
；
；
；
In the method, in the process of the invention, For the output capacity of the current evaporator,/>For the change in temperature TZ1 after the evaporator coil,/>To set dew point temperature,/>The temperature after the evaporator coil, d is the absolute moisture content;
when the absolute moisture content d1 of the inlet air is smaller than the set value Output capacity of evaporator/>The method comprises the following steps:
；
；
；
In the method, in the process of the invention, T3 is the exhaust temperature, which is the variation of the exhaust temperatureTo set temperature,/>Is a preset constant.
(2) The control of the electric heater of the air conditioning unit comprises the following steps:
When the air supply temperature T2 is greater than the set value When the electric heater stops outputting;
When the air supply temperature T2 is smaller than the set value When the electric heater outputs normally, the normal output means that the electric heater acts according to an original program;
when the air supply temperature T2 is less than or equal to the set value And is greater than or equal to the set value/>When the electric heater keeps the current output;
wherein, Is a preset constant.
Embodiment two:
As shown in fig. 2, the embodiment of the invention provides a heating method of a fresh air constant temperature and humidity system, wherein the fresh air constant temperature and humidity system comprises an air conditioning unit and a constant temperature and humidity chamber which are communicated through an air duct, and the heating method comprises the following steps:
S201, acquiring air supply temperature and humidity of an air conditioning unit, and calculating the absolute moisture content of air supply according to the air supply humidity;
S202, acquiring set temperature and humidity of a constant temperature and humidity chamber, and calculating and setting absolute moisture content according to the set humidity;
S203, controlling the electric heater and the humidifier of the air conditioning unit according to the air supply temperature, the set temperature, the absolute air supply moisture content and the set absolute moisture content.
(1) The control of the humidifier of the air conditioning unit comprises the following steps:
when the absolute moisture content d2 of the air supply is greater than a preset value When the humidifier stops outputting;
When the absolute moisture content d2 of the air supply is less than or equal to a preset value When the humidifier outputs normally;
wherein, Is a preset constant.
(2) The control of the electric heater of the air conditioning unit comprises:
when the current output capacity of the condenser is less than 70% of rated output capacity or when the supply air temperature T2 is greater than a set value When the electric heater stops outputting;
when the current output capacity of the condenser is more than or equal to 70% of rated output capacity and the air supply temperature T2 is less than the set value When the electric heater outputs normally;
wherein, Is a preset constant.
Embodiment III:
As shown in fig. 3, the embodiment of the invention provides a full fresh air constant temperature and humidity system, which comprises an air conditioning unit 1, a constant temperature and humidity chamber 2 and a controller 3, wherein the air conditioning unit 1 comprises a shell 11, two ends of the shell 11 are respectively provided with an air inlet 12 and an air outlet 13, and an air inlet temperature and humidity sensor 101, a heat exchanger 102, a temperature sensor 103, an electric heater 104, a humidifier 105 and an air supply temperature and humidity sensor 106 are sequentially arranged from the air inlet 12 to the air outlet 13 in the shell 11; the shell 11 is provided with a compressor, and the compressor is connected to the heat exchanger 102 through a pipeline; the air supply outlet 13 is connected to the constant temperature and humidity chamber 2 through a pipeline, and an exhaust temperature and humidity sensor 21 is arranged at an exhaust position of the constant temperature and humidity chamber 2; the air inlet temperature and humidity sensor 101, the temperature sensor 103, the air supply temperature and humidity sensor 106, the air exhaust temperature and humidity sensor 21, the humidifier 105, the electric heater 104 and the compressor are all connected to the controller 3 through wires; the controller 3 is used for a cooling method of a fresh air constant temperature and humidity system provided in the first embodiment or a heating method of a fresh air constant temperature and humidity system provided in the second embodiment.
A solid-state relay is also connected between the controller 3 and the electric heater 104, the contact ends of the solid-state relay are respectively connected to the mains supply and the electric heater 104, the control end of the solid-state relay is connected to the controller 3, and the controller 3 controls the solid-state relay to steplessly adjust the electric heater 104 by adopting a PID algorithm. The compressor adopts an air injection enthalpy-increasing variable frequency scroll compressor.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (4)
1. The utility model provides a refrigerating method of fresh air constant temperature and humidity system, fresh air constant temperature and humidity system includes air conditioning unit and constant temperature and humidity room that switches on through the wind channel, air conditioning unit includes along evaporimeter and the electric heater that wind direction set gradually in the wind channel, its characterized in that, refrigerating method includes:
Acquiring the air inlet humidity, the rear temperature of the evaporator coil and the air supply temperature of the air conditioning unit, and calculating the absolute moisture content of the air inlet according to the air inlet humidity;
acquiring set temperature and humidity and exhaust temperature of the constant temperature and humidity chamber, and calculating set absolute moisture content and set dew point temperature according to the set humidity;
Controlling an evaporator and an electric heater of the air conditioning unit according to the absolute moisture content of the inlet air, the rear temperature of the evaporator coil, the air supply temperature, the set temperature, the exhaust temperature, the set absolute moisture content and the set dew point temperature;
Wherein, the control of the evaporator of the air conditioning unit comprises:
When the absolute moisture content D1 of the inlet air is larger than the set value D1, the output capacity P of the evaporator is as follows:
P＝P0×(100％+6×ΔTdt％+ΔTZ1×2％)
ΔTdt＝Td-TZ1
D1＝d
Wherein P 0 is the output capacity of the current evaporator, deltaTZ 1 is the variation of the temperature TZ1 after the evaporator coil, td is the set dew point temperature, TZ1 is the temperature after the evaporator coil, and d is the set absolute moisture content;
When the absolute moisture content D1 of the inlet air is smaller than the set value D2, the output capacity P of the evaporator is as follows:
P＝P0×(100％+6×ΔTt％+ΔT3×2％)
ΔTt＝T-T3
D2＝d-x
Wherein DeltaT 3 is the variation of the exhaust temperature, T3 is the exhaust temperature, T is the set temperature, and x is the preset constant;
The control of the electric heater of the air conditioning unit comprises the following steps:
When the air supply temperature T2 is greater than the set value S1 and S1=T-Z, the electric heater stops outputting;
when the air supply temperature T2 is smaller than the set value S2, S2=T-Z1, the electric heater outputs normally;
When the air supply temperature T2 is smaller than or equal to the set value S1 and larger than or equal to the set value S2, the electric heater keeps the current output;
wherein Z, Z is a preset constant.
2. The method for cooling a fresh air constant temperature and humidity system according to claim 1, wherein calculating the set absolute humidity and the set dew point temperature according to the set humidity comprises:
Th＝6.2057·EXP(0.1043·Td)
Where P is the air pressure, ps is the partial pressure of water vapor, th is the set humidity, d is the set absolute moisture content, and Td is the set dew point temperature.
3. The utility model provides a heating method of fresh air constant temperature and humidity system, fresh air constant temperature and humidity system includes air conditioning unit and constant temperature and humidity room that switches on through the wind channel, air conditioning unit includes along condenser and the electric heater that wind direction set gradually in the wind channel, its characterized in that, heating method includes:
Acquiring the air supply temperature and humidity of the air conditioning unit, and calculating the absolute moisture content of the air supply according to the air supply humidity;
acquiring a set temperature and humidity of a constant temperature and humidity chamber, and calculating a set absolute moisture content according to the set humidity;
Controlling an electric heater and a humidifier of the air conditioning unit according to the air supply temperature, the set temperature, the absolute air supply moisture content and the set absolute moisture content;
wherein, the control of the electric heater of the air conditioning unit comprises:
when the current output capacity of the condenser is smaller than 70% of rated output capacity or when the air supply temperature T2 is larger than a set value S3, S3=T+Z, stopping the output of the electric heater;
When the current output capacity of the condenser is larger than or equal to 70% of rated output capacity and the air supply temperature T2 is smaller than the set value S4, S4=T+Z1, the electric heater outputs normally;
wherein Z, Z is a preset constant.
4. The heating method of the fresh air constant temperature and humidity system according to claim 3, wherein the control of the humidifier of the air conditioning unit comprises:
When the absolute moisture content D2 of the air supply is larger than a preset value D3, D3 = D + y, stopping outputting the humidifier;
When the absolute moisture content D2 of the air supply is smaller than or equal to a preset value D4, D4=d-y, the humidifier outputs normally;
wherein y is a preset constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210965843.XA CN115218466B (en) | 2022-08-12 | 2022-08-12 | Fresh air constant temperature and humidity system and refrigerating method and heating method thereof |
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| CN202210965843.XA CN115218466B (en) | 2022-08-12 | 2022-08-12 | Fresh air constant temperature and humidity system and refrigerating method and heating method thereof |
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| CN115218466B true CN115218466B (en) | 2024-04-26 |
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| CN211099081U (en) * | 2019-08-15 | 2020-07-28 | 济源艾探电子科技有限公司 | Constant temperature and humidity test box |
| CN113229613A (en) * | 2020-01-22 | 2021-08-10 | 黄远华 | Multifunctional air conditioner for dining table |
| CN113820163A (en) * | 2021-11-25 | 2021-12-21 | 中国飞机强度研究所 | Temperature and humidity control system and method for airplane test |
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