High-precision constant-temperature and constant-humidity test room

Abstract

The invention relates to the technical field of laboratories, and discloses a high-precision constant-temperature and constant-humidity laboratory which comprises a climate chamber, a fresh air inlet is formed in one side of a machine room, a fresh air pretreatment unit communicated with the fresh air inlet is arranged in the machine room, and the fresh air pretreatment unit is used for pretreating fresh air; a fresh air treatment unit connected with the fresh air pretreatment unit is arranged in the machine room, the output end of the fresh air treatment unit is communicated with a temperature and humidity main treatment system in the climate chamber, and the temperature and humidity main treatment system is arranged in the climate chamber; according to the technical scheme, by arranging the fresh air pretreatment unit, outdoor air can be filtered, so that the quality of air entering the climate chamber is guaranteed, meanwhile, the fresh air pretreatment unit, the fresh air treatment unit and the temperature and humidity main treatment system work cooperatively, the temperature and humidity of the air can be controlled conveniently, and the service life of the air is prolonged. The indoor temperature and humidity operation range is wider, and the temperature and humidity control precision is higher.

Description

Technical Field

[0001] The invention relates to the technical field of test chambers, in particular to a high-precision constant temperature and humidity test chamber. Background Art

[0002] The main purpose of the constant temperature and humidity test room is to simulate various environmental conditions, such as temperature, humidity, pressure, etc., to test the performance and reliability of products or materials.

[0003] The existing Chinese patent with publication number CN204648556U discloses a constant temperature and humidity test room, including a constant temperature and humidity room, a wind cabinet, and a control box; an air duct is provided on the upper part of the constant temperature and humidity room, and vents are evenly opened at the lower end of the air duct. A first temperature and humidity sensor is arranged at the upper position close to the air duct, and a second temperature and humidity sensor is arranged at the middle position; a circulating fan is arranged on the upper part of the wind cabinet, and the air outlet of the circulating fan is connected to the air duct, and an air inlet is arranged at the lower part of the wind cabinet and is connected to the constant temperature and humidity room. An electric heater, a dehumidification air valve, a dehumidification surface cooler, and a humidifier are arranged in the wind cabinet; the outer walls and the top floor of the constant temperature and humidity room and the wind cabinet are provided with insulation walls, and the control box has a control line connecting the first temperature and humidity sensor, the second temperature and humidity sensor, the circulating fan, the electric heater, the dehumidification air valve, the dehumidification surface cooler, and the humidifier, and the dehumidification surface cooler is connected to the chiller.

[0004] The above patent has many advantages, but also some problems: the temperature distribution inside the drying chamber is uneven, which affects the progress of the experiment. Summary of the invention

[0005] The present invention provides a high-precision constant temperature and humidity test chamber, which solves the problems mentioned in the above background technology by arranging a fresh air pretreatment unit, a fresh air treatment unit and a temperature and humidity main treatment system.

[0006] The present invention provides the following technical solution: a high-precision constant temperature and humidity test room, comprising a climate room, a fresh air inlet is arranged on one side of the machine room, a fresh air pretreatment unit connected to the fresh air inlet is arranged in the machine room, the fresh air pretreatment unit is used to send the pretreated fresh air into the temperature and humidity main processing system in the climate room, the output end of the fresh air treatment unit is connected to the top of the temperature and humidity main processing system in the climate room, the temperature and humidity main processing system is arranged in the climate room, and the temperature and humidity main processing system is used to control the temperature and humidity inside the climate room; A buffer chamber is arranged on one side of the climate chamber, a medium-efficiency exhaust box is arranged on one side of the top of the climate chamber close to the buffer chamber, a ventilation shutter connected to the machine room is arranged on one side of the bottom of the buffer chamber, an anti-backflow exhaust cabinet is arranged in the machine room, an exhaust hood is arranged at the input end of the anti-backflow exhaust cabinet, and an exhaust outlet installed on the machine room is connected at the output end of the anti-backflow exhaust cabinet.

[0007] As an optional solution of the high-precision constant temperature and humidity test chamber described in the present invention, the temperature and humidity main processing system includes a 4-stage electric heating module, and the 4-stage electric heating module includes a first-stage electric heating module, a second-stage electric heating module, a third-stage electric heating module and a fourth-stage electric heating module. The first-stage electric heating module is installed in the fresh air pretreatment unit, the second-stage electric heating module is installed at the air inlet end of the fresh air treatment unit, the third-stage electric heating module is installed at the air outlet end of the fresh air treatment unit, and the fourth-stage electric heating module is installed in the temperature and humidity main processing system; the fresh air pretreatment unit includes an air filter, an electric heater, and a control system. Its main function is to heat the outdoor cold air to about 5°C to prevent the indoor air duct from freezing and cracking, while preliminarily raising the air temperature and reducing the heating load of the fresh air treatment unit.

[0008] As an optional solution for the high-precision constant temperature and humidity test chamber described in the present invention, the fresh air processing unit includes an air filter, a dehumidifier, a humidifier, a heater, a cooler and a first control system. The air filter adopts a high-efficiency filter to filter out dust and particulate matter in the fresh air to ensure that the fresh air entering the climate chamber is clean; the dehumidifier adopts condensation dehumidification technology to remove moisture in the fresh air and control the dryness of the fresh air; the humidifier adopts an ultrasonic humidifier to humidify the fresh air; the heater adopts electric heating to preheat the fresh air; the cooler adopts chilled water cooling to cool the fresh air; the first control system adopts a high-performance embedded controller to monitor the temperature, humidity and cleanliness of the fresh air in real time, and adjust the working status of the air filter, dehumidifier, heater and cooler as needed.

[0009] As an optional solution for the high-precision constant temperature and humidity test chamber described in the present invention, the top of the climate chamber is covered with air supply ceiling perforated plates, the output end of the fresh air treatment unit is connected to the temperature and humidity main processing system, and a spoiler fan is installed above the air supply ceiling perforated plates. The spoiler fan improves the uniformity of air supply through mixing action.

[0010] As an optional solution for the high-precision constant temperature and humidity test chamber described in the present invention, a hanger is provided on the top of the climate chamber, and four groups of slots are provided on the hanger. The four groups of slots are used to connect the air supply ceiling orifice plates, so that each group of air supply ceiling orifice plates can fit tightly without gaps, and the air supply ceiling orifice plates are fixed to the hanger by screws.

[0011] As an optional solution for the high-precision constant temperature and humidity test chamber described in the present invention, the temperature and humidity main processing system also includes a constant temperature and humidity air conditioner, which is installed in the climate room. The constant temperature and humidity air conditioner is equipped with 4 ultrasonic humidifiers for improving the humidity control accuracy and improving the temperature and humidity control range. The constant temperature and humidity air conditioner is also equipped with 1 rotary dehumidifier and 1 refrigeration dehumidifier. Through the combination of the rotary dehumidifier and the refrigeration dehumidifier, the control range of temperature and humidity is improved.

[0012] As an optional solution for the high-precision constant temperature and humidity test chamber described in the present invention, a chilled water air-conditioning sharing unit connected to the fresh air pretreatment unit and the temperature and humidity main processing system is also provided in the machine room. The chilled water air-conditioning sharing unit is used to provide chilled water for fresh air pretreatment and temperature control of the climate chamber. The chilled water air-conditioning sharing unit includes a condenser, a condensing fan, a water tank, a water pump and a control system. The chilled water air-conditioning sharing unit is used to produce chilled water, the water pump is used to circulate and transport chilled water, the cooling tower is used to dissipate heat to ensure that the temperature of the chilled water is appropriate, the heat exchanger is used to transfer the coldness of the chilled water to the fresh air pretreatment unit and the temperature and humidity main processing system of the climate chamber, and the second control system is used to coordinate the work of the chilled water unit, the water pump, the cooling tower and the heat exchanger to achieve precise control of the chilled water.

[0013] As an optional solution of the high-precision constant temperature and humidity test chamber of the present invention, the temperature of the fresh air pretreatment unit is controlled by a temperature control formula, and the temperature control formula is as follows: ; Among them, T out is the output control signal; K p is the proportional gain; K i is the integral gain; K d is the differential gain; T set is the set temperature; T current is the current temperature.

[0014] As an optional solution of the high-precision constant temperature and humidity test chamber of the present invention, the temperature and humidity main processing system controls the humidity by using a humidity control formula to control the temperature. The humidity control formula is as follows: ; Among them, H out is the output control signal; K p is the proportional gain; K i is the integral gain; K d is the differential gain; H set is the set temperature; H current is the current temperature.

[0015] As an optional solution of the high-precision constant temperature and humidity test chamber of the present invention, the dehumidification formula used by the dehumidifier in the fresh air pretreatment unit is: ; Among them, m w is the mass of water vapor; P v is the partial pressure of water vapor; V is the volume of air; R v is the water vapor gas constant; T is the temperature; The heating formula used by the heater in the fresh air pretreatment unit is: Q=m·c p ΔT; Where Q is the amount of heat added; m is the mass of air; cp is the specific heat of air; and ΔT is the temperature change.

[0016] The present invention has the following beneficial effects: 1. In this high-precision constant temperature and humidity test room, by setting up a fresh air pretreatment unit, the outdoor air can be filtered to ensure the quality of the air entering the climate room. At the same time, the fresh air pretreatment unit works together with the fresh air treatment unit and the temperature and humidity main processing system to facilitate the control of the temperature and humidity of the air, making the indoor temperature and humidity operating range wider and the temperature and humidity control accuracy higher; 2. In the high-precision constant temperature and humidity test room, the temperature and humidity main processing system is equipped with 4-level electric heating modules, so that the first-level electric heating module is installed in the fresh air pretreatment unit, the second-level electric heating module is installed at the air inlet end of the fresh air treatment unit, the third-level electric heating module is installed at the air outlet end of the fresh air treatment unit, and the fourth-level electric heating module is installed in the temperature and humidity main processing system. Through the gradual regulation of the 4-level electric heating, firstly, the control accuracy of indoor temperature and humidity can be improved, secondly, the operating stability of indoor temperature and humidity can be improved, and thirdly, it can be suitable for the extremely cold weather in the north in winter, increasing the wide range of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention.

[0018] Figure 2 It is a structural block diagram of the fresh air pretreatment unit of the present invention.

[0019] Figure 3 It is a structural block diagram of the chilled water air conditioning shared unit of the present invention.

[0020] Figure 4 It is a schematic diagram of the surface structure of the hanging piece of the present invention.

[0021] Figure 5 It is a cross-sectional view of the cross-sectional structure of the hanging piece of the present invention.

[0022] In the figure: 1. Machine room; 2. Climate chamber; 3. Fresh air inlet; 4. Fresh air pre-treatment unit; 5. Fresh air treatment unit; 6. Temperature and humidity main processing system; 7. Buffer room; 8. Medium-efficiency exhaust box; 9. Ventilation shutters; 10. Anti-backflow exhaust cabinet; 11. Exhaust hood; 12. Exhaust outlet; 13. Air supply ceiling perforated plate; 14. Turbine fan; 15. Hanging parts; 16. Card slot; 17. Cold water air conditioning shared unit. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] For example, see Figure 1-Figure 5 A high-precision constant temperature and humidity test room, comprising a climate room 2, a fresh air inlet 3 is arranged on one side of the machine room 1, a fresh air pretreatment unit 4 connected to the fresh air inlet 3 is arranged in the machine room 1, the fresh air pretreatment unit 4 is used to send the pretreated fresh air into the temperature and humidity main processing system 6 in the climate room 2, the output end of the fresh air treatment unit 5 is connected to the top of the temperature and humidity main processing system 6 in the climate room 2, the temperature and humidity main processing system 6 is arranged in the climate room 2, and the temperature and humidity main processing system 6 Used to control the temperature and humidity inside the climate chamber 2; a buffer chamber 7 is provided on one side of the climate chamber 2, a medium-efficiency exhaust box 8 is provided on the top side of the climate chamber 2 close to the buffer chamber 7, a ventilation shutter 9 is provided on the bottom side of the buffer chamber 7 and is connected to the machine room 1, an anti-backflow exhaust cabinet 10 is provided in the machine room 1, an exhaust hood 11 is provided at the input end of the anti-backflow exhaust cabinet 10, and an exhaust outlet 12 installed on the machine room 1 is connected at the output end of the anti-backflow exhaust cabinet 10.

[0025] refer to Figures 1 to 5, wherein the temperature and humidity main processing system 6 includes a 4-stage electric heating module, and the 4-stage electric heating module includes a first-stage electric heating module, a second-stage electric heating module, a third-stage electric heating module and a fourth-stage electric heating module. The first-stage electric heating module is installed in the fresh air pretreatment unit 4, the second-stage electric heating module is installed at the air inlet end of the fresh air treatment unit 5, the third-stage electric heating module is installed at the air outlet end of the fresh air treatment unit 5, and the fourth-stage electric heating module is installed in the temperature and humidity main processing system 6; the fresh air pretreatment unit 4 includes an air filter, an electric heater, and a control system. Its main function is to heat the outdoor cold air to about 5°C to prevent the indoor air duct from freezing and cracking, and at the same time preliminarily increase the air temperature to reduce the heating load of the fresh air treatment unit 5.

[0026] refer to Figures 1 to 5 , wherein the fresh air processing unit 5 includes an air filter, a dehumidifier, a humidifier, a heater, a cooler and a first control system. The air filter adopts a high-efficiency filter to filter out dust and particulate matter in the fresh air to ensure that the fresh air entering the climate chamber 2 is clean; the dehumidifier adopts condensation dehumidification technology to remove moisture in the fresh air and control the dryness of the fresh air; the humidifier adopts an ultrasonic humidifier to humidify the fresh air; the heater adopts electric heating to preheat the fresh air; the cooler adopts chilled water cooling to cool the fresh air; the first control system adopts a high-performance embedded controller to monitor the temperature, humidity and cleanliness of the fresh air in real time, and adjust the working status of the air filter, dehumidifier, heater and cooler as needed.

[0027] refer to Figures 1 to 5 , wherein the top of the climate chamber 2 is covered with air supply ceiling orifice plates 13, the output end of the fresh air handling unit 5 is connected to the temperature and humidity main processing system 6, and a spoiler fan 14 is installed above the air supply ceiling orifice plates 13, and the spoiler fan 14 improves the uniformity of air supply through mixing. The top of the climate chamber 2 is provided with a hanger 15, and the hanger 15 is provided with four groups of card slots 16, and the four groups of card slots 16 are used to connect the air supply ceiling orifice plates 13, so that each group of air supply ceiling orifice plates 13 fits tightly without gaps, and the air supply ceiling orifice plates 13 are fixed to the hanger 15 by screws. The temperature and humidity main processing system 6 also includes a constant temperature and humidity air conditioner, which is installed in the climate chamber 2. The constant temperature and humidity air conditioner is equipped with 4 ultrasonic humidifiers for improving the humidity control accuracy and improving the temperature and humidity control range. The constant temperature and humidity air conditioner is also equipped with 1 rotary dehumidifier and 1 refrigeration dehumidifier. Through the combination of the rotary dehumidifier and the refrigeration dehumidifier, the control range of temperature and humidity is improved.

[0028] refer to Figures 1 to 5, wherein the machine room 1 is also provided with a chilled water air conditioning sharing unit 17 connected to the fresh air pretreatment unit 4 and the temperature and humidity main processing system 6, and the chilled water air conditioning sharing unit 17 is used to provide chilled water for fresh air pretreatment and temperature control of the climate chamber 2, and the chilled water air conditioning sharing unit 17 includes a condenser, a condensing fan, a water tank, a water pump and a control system, and the chilled water air conditioning sharing unit 17 is used to produce chilled water, and the water pump is used to circulate and transport chilled water, and the cooling tower is used to dissipate heat to ensure that the temperature of the chilled water is appropriate, and the heat exchanger is used to transfer the coldness of the chilled water to the fresh air pretreatment unit 4 and the temperature and humidity main processing system 6 of the climate chamber 2, and the second control system is used to coordinate the work of the chilled water unit, the water pump, the cooling tower and the heat exchanger to achieve precise control of the chilled water. The temperature control formula is used to control the preheating temperature in the fresh air pretreatment unit 4, and the temperature control formula is as follows: ; Among them, T out is the output control signal; K p is the proportional gain; K i is the integral gain; K d is the differential gain; T set is the set temperature; T current is the current temperature.

[0029] refer to Figures 1 to 5 , wherein the temperature and humidity main processing system 6 controls the humidity by using a humidity control formula to control the temperature, and the humidity control formula is specifically as follows: ; Among them, H out is the output control signal; K p is the proportional gain; K i is the integral gain; K d is the differential gain; H set is the set temperature; H current is the current temperature.

[0030] As an optional solution of the high-precision constant temperature and humidity test chamber of the present invention, the dehumidification formula used by the dehumidifier in the fresh air pretreatment unit 4 is: ; Among them, m w is the mass of water vapor; P v is the partial pressure of water vapor; V is the volume of air; R v is the water vapor gas constant; T is the temperature; The heating formula used by the heater in the fresh air pretreatment unit 4 is: Q = m·c p ΔT; Where Q is the heating amount; m is the air mass; c p is the specific heat of air; ΔT is the temperature change.

[0031] refer to Figures 1 to 5 In the high-precision constant temperature and humidity test room, by setting up the fresh air pretreatment unit 4, the outdoor air can be filtered and processed, so as to ensure the quality of the air entering the climate chamber 2. At the same time, the fresh air pretreatment unit 4 works with the fresh air treatment unit 5 and the temperature and humidity main processing system 6 to facilitate the control of the temperature and humidity of the air, so that the indoor temperature and humidity operation range is wider and the temperature and humidity control accuracy is higher. In the high-precision constant temperature and humidity test room, the temperature and humidity main processing system 6 is provided with a 4-level electric heating module, so that the first-level electric heating module is installed in the fresh air pretreatment unit 4, the second-level electric heating module is installed at the air inlet end of the fresh air treatment unit 5, the third-level electric heating module is installed at the air outlet end of the fresh air treatment unit 5, and the fourth-level electric heating module is installed in the temperature and humidity main processing system 6. Through the gradual regulation of the 4-level electric heating, the control accuracy of the indoor temperature and humidity can be improved, the operation stability of the indoor temperature and humidity can be improved, and the third is that it can be applied to the extremely cold weather in the winter in the north, increasing the wide range of use.

[0032] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0033] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A high-precision constant temperature and humidity test chamber, comprising a climate chamber (2), characterized in that: A fresh air inlet (3) is provided on one side of the machine room (1), and a fresh air pre-processing unit (4) connected to the fresh air inlet (3) is provided in the machine room (1), and the fresh air pre-processing unit (4) is used to pre-process the fresh air. A fresh air processing unit (5) connected to the fresh air pre-processing unit (4) is provided in the machine room (1), and the fresh air processing unit (5) is used to send the pre-processed fresh air into the temperature and humidity main processing system (6) in the climate room, and the output end of the fresh air processing unit (5) is connected to the top of the temperature and humidity main processing system (6) in the climate room, and the temperature and humidity main processing system (6) is provided in the climate room (2), and the temperature and humidity main processing system (6) is used to control the temperature and humidity inside the climate room (2); A buffer chamber (7) is provided on one side of the climate chamber (2); a medium-efficiency exhaust box (8) is provided on one side of the top of the climate chamber (2) near the buffer chamber (7); a ventilation shutter (9) connected to the machine room (1) is provided on one side of the bottom of the buffer chamber (7); an anti-backflow exhaust cabinet (10) is provided in the machine room (1); an exhaust hood (11) is provided at the input end of the anti-backflow exhaust cabinet (10); and an exhaust outlet (12) installed on the machine room (1) is provided at the output end of the anti-backflow exhaust cabinet (10).

2. The high-precision constant temperature and humidity test chamber according to claim 1, characterized in that: The temperature and humidity main processing system (6) comprises a four-stage electric heating module, wherein the four-stage electric heating module comprises a first-stage electric heating module, a second-stage electric heating module, a third-stage electric heating module and a fourth-stage electric heating module, wherein the first-stage electric heating module is installed in the fresh air pre-processing unit (4), the second-stage electric heating module is installed at the air inlet end of the fresh air processing unit (5), the third-stage electric heating module is installed at the air outlet end of the fresh air processing unit (5), and the fourth-stage electric heating module is installed in the temperature and humidity main processing system (6); the fresh air pre-processing unit (4) comprises an air filter, an electric heater, and a control system, and its main function is to heat the outdoor cold air to about 5°C to prevent the indoor air duct from freezing and cracking, and at the same time preliminarily increase the air temperature to reduce the heating load of the fresh air processing unit (5).

3. The high-precision constant temperature and humidity test chamber according to claim 2, characterized in that: The fresh air processing unit (6) includes an air filter, a dehumidifier, a humidifier, a heater, a cooler and a first control system. The air filter adopts a high-efficiency filter to filter out dust and particulate matter in the fresh air to ensure that the fresh air entering the climate chamber (2) is clean; the dehumidifier adopts condensation dehumidification technology to remove moisture in the fresh air and control the dryness of the fresh air; the humidifier adopts an ultrasonic humidifier to humidify the fresh air; the heater adopts an electric heating method to preheat the fresh air; the cooler adopts chilled water cooling to cool the fresh air; the first control system adopts a high-performance embedded controller to monitor the temperature, humidity and cleanliness of the fresh air in real time, and adjust the working status of the air filter, dehumidifier, heater and cooler as needed.

4. The high-precision constant temperature and humidity test chamber according to claim 3, characterized in that: The top of the climate chamber (2) is covered with air supply ceiling perforated plates (13); the output end of the fresh air processing unit (5) is connected to the temperature and humidity main processing system (6); a spoiler fan (14) is installed above the air supply ceiling perforated plates (13); the spoiler fan (14) improves air supply uniformity through mixing action.

5. The high-precision constant temperature and humidity test chamber according to claim 4, characterized in that: A hanging piece (15) is provided on the top of the climate chamber (2), and four groups of slots (16) are provided on the hanging piece (15). The four groups of slots (16) are used to connect air supply ceiling orifice plates (13), so that each group of air supply ceiling orifice plates (13) fits tightly together without any gap, and the air supply ceiling orifice plates (13) are fixed to the hanging piece (15) by screws.

6. The high-precision constant temperature and humidity test chamber according to claim 5, characterized in that: The temperature and humidity main processing system (6) also includes a constant temperature and humidity air conditioner, which is installed in the climate chamber (2). The constant temperature and humidity air conditioner is equipped with 4 ultrasonic humidifiers for improving the humidity control accuracy and the temperature and humidity control range. The constant temperature and humidity air conditioner is also equipped with a rotary dehumidifier and a refrigeration dehumidifier. Through the combination of the rotary dehumidifier and the refrigeration dehumidifier, the temperature and humidity control range is improved.

7. The high-precision constant temperature and humidity test chamber according to claim 6, characterized in that: The machine room (1) is also provided with a chilled water air conditioning sharing unit (17) connected to the fresh air pretreatment unit (4) and the temperature and humidity main processing system (6). The chilled water air conditioning sharing unit (17) is used to provide chilled water for fresh air pretreatment and temperature control of the climate chamber (2). The chilled water air conditioning sharing unit (17) includes a condenser, a condensing fan, a water tank, a water pump and a control system. The chilled water air conditioning sharing unit (17) is used to generate chilled water. The water pump is used to circulate and transport the chilled water. The cooling tower is used to dissipate heat to ensure that the temperature of the chilled water is appropriate. The heat exchanger is used to transfer the coldness of the chilled water to the fresh air pretreatment unit (4) and the temperature and humidity main processing system (6) of the climate chamber (2). The second control system is used to coordinate the operation of the chilled water unit, the water pump, the cooling tower and the heat exchanger to achieve precise control of the chilled water.

8. The high-precision constant temperature and humidity test chamber according to claim 7, characterized in that: The preheating temperature in the fresh air pretreatment unit (4) is controlled by using a temperature control formula, and the temperature control formula is specifically as follows: ； Among them, T out is the output control signal; K p is the proportional gain; K i is the integral gain; K d is the differential gain; T set is the set temperature; T current is the current temperature.

9. The high-precision constant temperature and humidity test chamber according to claim 8, characterized in that: The humidity control formula is used to control the temperature in the temperature and humidity main processing system (6). The humidity control formula is as follows: ； Among them, H out is the output control signal; K p is the proportional gain; K i is the integral gain; K d is the differential gain; H set is the set temperature; H current is the current temperature.

10. The high-precision constant temperature and humidity test chamber according to claim 9, characterized in that: The dehumidification formula used by the dehumidifier in the fresh air pretreatment unit (4) is: ； Among them, m w is the mass of water vapor; P v is the partial pressure of water vapor; V is the volume of air; R v is the water vapor gas constant; T is the temperature; The heating formula used by the heater in the fresh air pretreatment unit is: Q=m·c p ·ΔT; Where Q is the heating amount; m is the air mass; c p is the specific heat of air; ΔT is the temperature change.

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