CN109507228B - Multifunctional calibration type room calorimeter with rotary dehumidifier and measuring method thereof - Google Patents

Multifunctional calibration type room calorimeter with rotary dehumidifier and measuring method thereof Download PDF

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CN109507228B
CN109507228B CN201811283188.XA CN201811283188A CN109507228B CN 109507228 B CN109507228 B CN 109507228B CN 201811283188 A CN201811283188 A CN 201811283188A CN 109507228 B CN109507228 B CN 109507228B
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temperature
bin
humidity
test
rotary dehumidifier
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CN109507228A (en
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张于峰
庞俊伟
姚胜
吴璋翔
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Tianjin University
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Tianjin University
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00Investigating or analyzing materials by the use of thermal means
    • G01N25/20Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M99/00Subject matter not provided for in other groups of this subclass
    • G01M99/002Thermal testing
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M99/00Subject matter not provided for in other groups of this subclass
    • G01M99/005Testing of complete machines, e.g. washing-machines or mobile phones

Abstract

The invention discloses a multifunctional standardized room calorimeter with a rotary dehumidifier, which comprises a main structure of a laboratory, a temperature control system, a humidity control system, an automatic data acquisition system and a test system, wherein the main structure of the laboratory is provided with a rotary dehumidifier; the main structure of the laboratory comprises a high-temperature cabin and a low-temperature cabin; a test piece frame is arranged on a partition wall between the high-temperature bin and the low-temperature bin, and a guide plate and a circulating fan are arranged in the low-temperature bin; a rotary dehumidifier, an ultrasonic humidifier and a compressor refrigerating unit are arranged in the high-temperature bin and the low-temperature bin; the humidity value is input into a humidity controller in the form of a 4-20mA current analog signal; when the rotary dehumidifier works, part of air from the bin is sent into the bin after being adsorbed and dehumidified by the rotary wheel; and uniformly inputting the test results into the computer. By adding the rotary dehumidifier in the test room, the control range of the humidity of the high-temperature bin and the low-temperature bin in the test room is expanded, so that the requirement that the relative humidity is lower than 20 percent can be met under the temperature working condition according to the national standard requirement of the high-temperature bin.

Description

Multifunctional calibration type room calorimeter with rotary dehumidifier and measuring method thereof
Technical Field
The invention belongs to the technical field of air conditioning equipment thermal performance test, comprises a necessary air conditioning equipment system of a traditional calibration type room calorimeter laboratory, rotary dehumidifier equipment, a heat recovery heat exchange plate and the like, and is a dual-function experiment table capable of carrying out a building door and window heat transfer coefficient test and a room air conditioner performance test.
Background
The development of room air conditioner test technology has been the driving force for the development of air conditioning technology, which has been developed in order to improve the temperature and humidity of air in a building. The temperature and humidity of the air inside the building are mainly influenced by the building envelope, and designers need to select a room air conditioner with matched performance on the basis of knowing the heat transfer coefficient and the heat leakage of doors and windows of the building envelope. If a novel multifunctional room calorimeter testing room can be designed and built, the same testing stand can be used for testing the thermal performance of a room air conditioner and the heat transfer coefficient of building doors and windows or building materials, so that a large amount of construction cost and testing cost of the testing stand can be saved.
The room calorimeter method and the enthalpy method are the measuring methods with the highest utilization rate in the thermal performance test of the room air conditioner. The research of domestic scholars shows that compared with a heat balance room calorimeter method, a calibration type room calorimeter method has the advantages that the equipment cost is low, the test precision is higher than that of an enthalpy value method, and the method is a measurement method which gives consideration to both the test cost and the test precision.
A traditional room calorimeter calibrating test room mainly comprises a high-temperature bin and a low-temperature bin, wherein the high-temperature bin simulates the environment of air temperature and humidity in the bin, and the low-temperature bin simulates the environment of outdoor air temperature and humidity. The laboratory air temperature and humidity control range of the traditional calibration type room calorimeter is smaller. Because it is dehumidified only by the evaporator in the in-bin refrigeration unit, the relative humidity of the air cannot be controlled below 20%. But for the test of the heat transfer coefficient of building doors and windows or building materials, the relative humidity of the high-temperature cabin is required to be below 20 percent besides the condition of requiring constant large temperature difference between the high-temperature cabin and the low-temperature cabin. Therefore, the traditional calibration type room calorimeter laboratory can not be used as a test bench for testing the heat transfer coefficient of building doors and windows or building materials
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a multifunctional room calibration calorimeter with a rotary dehumidifier and a measurement method thereof, and the rotary dehumidifier is additionally arranged in a test room, so that the control range of the humidity of high and low temperature bins in the test room is expanded, and the requirement that the relative humidity is lower than 20 percent can be met by the high temperature bin under the temperature working condition according to the national standard requirement. In addition, the low-temperature bin is provided with the guide plate, so that the outdoor wind speed environment can be simulated by changing the distance between the guide plate and the test piece frame to realize the outdoor wind speed of the test piece frame. Air temperature control system and humidity control system mutually independent in this patent crowning, low temperature storehouse to the humiture condition of interfering mutually that brings after the temperature of avoiding high temperature storehouse and low temperature storehouse, humidity control system are related.
In order to solve the technical problem, the invention provides a multifunctional standard room calorimeter with a rotary dehumidifier, which comprises a laboratory main body structure, a temperature control system, a humidity control system, an automatic data acquisition system and a test system, wherein the temperature control system is connected with the rotary dehumidifier; the main structure of the test room comprises a high-temperature cabin and a low-temperature cabin; a test piece frame is arranged on a partition wall between the high-temperature cabin and the low-temperature cabin, the test piece frame comprises a reserved test frame with the thickness of 1.5m multiplied by 1.5m and a reserved test frame with the thickness of 1m multiplied by 2m, a guide plate and a circulating fan are arranged on one side, close to the partition wall, in the low-temperature cabin, the guide plate and the circulating fan are used for simulating air flow outside a door and window, and the size of the air flow is adjusted by changing the distance between the guide plate and the partition wall; a rotary dehumidifier, an ultrasonic humidifier and a compressor refrigerating unit are arranged on one sides of the high-temperature bin and the low-temperature bin, which are far away from the partition wall; the test system comprises a PT100 temperature sensor, a refrigerant pressure sensor, a flowmeter, a heat flow sensor, a transmitter, a data patrol instrument and a computer, wherein the transmitter outputs 4-20mA current signals correspondingly; when the performance test of the room air conditioner and the heat transfer coefficient test of building doors and windows or building materials are carried out, the arrangement positions and the number of corresponding temperature measuring points are correspondingly adjusted according to the test requirements, and the temperature control system comprises an electric heater, a compressor refrigerating unit, PLC (programmable logic controller) and PT100 temperature sensors, a compressor refrigerating unit relay and an electric heater SSR (simple sequence repeat) solid state relay; the PT100 temperature sensor is used for monitoring the temperature in the high-temperature bin and inputting a temperature value to the PLC in a 4-20mA current analog signal mode; the humidity control system comprises an ultrasonic humidifier, a rotary dehumidifier, a humidity sensor, a humidity controller, a humidifier relay and a rotary dehumidifier relay; the humidity sensor is used for monitoring the air humidity in the high-temperature bin and inputting a humidity value to the humidity controller in a 4-20mA current analog signal mode; when the rotary wheel dehumidifier works, part of air from the bin is adsorbed and dehumidified by the rotary wheel and then is sent into the bin; and uniformly inputting the test results into the computer.
The measuring method of the multifunctional calibration type room calorimeter with the rotary dehumidifier comprises the following steps:
the PLC performs PID control on the on-off condition of the SSR solid state relay of the electric heater according to the measured temperature value and the set temperature value in the cabin, and controls the on-off condition of the relay of the compressor refrigerating unit according to the measured temperature value and the set temperature value in the cabin so as to start and stop the electric heater and the compressor refrigerating unit;
the humidity controller controls the on-off conditions of the humidifier relay and the rotary dehumidifier relay according to the measured value of the relative humidity in the bin and the set value of the relative humidity so as to start and stop the ultrasonic humidifier and the rotary dehumidifier.
The invention relates to a measuring method of a multifunctional calibration type room calorimeter with a rotary dehumidifier, wherein whether a compressor refrigerating unit is started or not is determined according to the temperature in a laboratory bin and the set temperature through a PLC (programmable logic controller), and the PLC determines the heating quantity of an electric heater by using the difference value of the temperature in the laboratory bin and the set temperature and adopting a PID (proportion integration differentiation) algorithm; when the set temperature of the laboratory is lower than the ambient temperature or the difference between the set temperature of the laboratory and the ambient temperature is less than 10 ℃, the compressor refrigerating unit operates, and the electric heater counteracts partial cold and heat to realize the control of refrigerating capacity or heating capacity; when the difference between the set temperature of the laboratory and the ambient temperature is more than 10 ℃, the compressor refrigerating unit does not operate, the electric heater does not have cold and heat counteraction, and at the moment, the heating quantity of the electric heater is only controlled; thereby realizing the purpose of temperature control; when the set temperature of the laboratory is 0 +/-5.0 ℃, the rotary dehumidifier is started firstly, then the temperature control system is started, otherwise, the temperature control system is started firstly, and after the temperature in the laboratory approaches the set temperature of the laboratory, the humidity control system is set and started, so that the temperature and the humidity in the laboratory are stabilized within the required temperature and humidity range.
The invention relates to a measuring method of a multifunctional calibration type room calorimeter with a rotary dehumidifier, wherein, when the calorimeter is used for the first time, the heat transfer coefficient of a high-temperature bin wall body is calibrated according to national standard requirements, and the calibration result is used for a room air conditioner performance test and a building door and window or building material heat transfer coefficient test.
Compared with the prior art, the invention has the beneficial effects that:
the multifunctional calibration type room calorimeter with the rotary dehumidifier can realize a temperature control range and a humidity control range which are larger than the control range of a traditional calibration type room calorimeter laboratory, and can be used for carrying out a building door and window or building material heat transfer coefficient test experiment which cannot be carried out by the traditional calibration type room calorimeter.
The use of PLC and PID control in the invention ensures that the control precision of the test bed still meets the national standard of related test requirements when the temperature and humidity control range is greatly improved. The reliability and the test precision of the test result are ensured.
The invention expands the test function of the test bed, thereby greatly reducing the construction cost and the related test cost.
Drawings
FIG. 1 is a schematic diagram of a laboratory structure of the multifunctional room calorimeter of the invention;
FIG. 2 is a control schematic of the temperature control system of the present invention;
FIG. 3 is a schematic diagram of the humidity control system of the present invention;
fig. 4 is a schematic diagram of an automatic data acquisition system according to the present invention.
1-high temperature chamber, 2-humidity sensor, 3-1.5m multiplied by 1.5m reserved test frame, 4-low temperature chamber, 5-rotary dehumidifier, 6-ultrasonic humidifier, 7-compressor refrigerating unit, 8-electric heater, 9-circulating fan, 10-guide plate, 11-1m multiplied by 2m reserved test frame, 12-PT100 temperature sensor, 13-PLC, 14-compressor refrigerating unit relay, 15-electric heater SSR solid relay, 16-humidity controller, 17-humidifier relay, 18-rotary dehumidifier relay, 20-refrigerant pressure sensor, 21-flowmeter, 22-heat flow sensor, 23, 24, 25, 26-4-20mA current signal transmitter, 27-data polling instrument, 28-computer.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples. The test system for the multifunctional room calorimeter calibration test room comprises a test room enclosure structure, a temperature control system, a humidity control system and an automatic data acquisition system. The main structure of the laboratory comprises a high-temperature cabin 1 and a low-temperature cabin 4.
The invention provides a multifunctional calibration type room calorimeter with a rotary dehumidifier, which comprises a laboratory main body structure, a temperature control system, a humidity control system, an automatic data acquisition system and a test system.
As shown in fig. 1, the main structure of the test chamber comprises a high-temperature chamber 1 and a low-temperature chamber 4; a test piece frame is arranged on a partition wall between the high-temperature bin 1 and the low-temperature bin 4,
the test piece frame comprises a reserved test frame 3 of 1.5m multiplied by 1.5m and a reserved test frame 11 of 1m multiplied by 2m, a guide plate 10 and a circulating fan 9 are arranged on one side, close to the partition wall, in the low-temperature chamber 4, the guide plate 10 and the circulating fan 9 are used for simulating air flow on the outdoor side of a door and a window, and the size of the air flow is adjusted by changing the distance between the guide plate 10 and the partition wall; and a rotary dehumidifier 5, an ultrasonic humidifier 6 and a compressor refrigerating unit 7 are arranged on one side of the high-temperature bin 1 and one side of the low-temperature bin 4, which are far away from the partition wall.
As shown in fig. 4, the testing system comprises a PT100 temperature sensor 12, a refrigerant pressure sensor 20, a flowmeter 21, a heat flow sensor 22, a transmitter with a 4-20mA current signal output, a data polling instrument 27 with automatic data acquisition and storage functions, and a computer 28; when the performance test of the room air conditioner and the heat transfer coefficient test of the building door and window or the building material are carried out, the arrangement positions and the number of the corresponding temperature measuring points are correspondingly adjusted according to the test requirements, and the test results are uniformly input into the computer 28.
As shown in fig. 2, the temperature control system includes an electric heater 8, a compressor refrigeration unit 7, a PLC (programmable logic controller) 13 and PT100 temperature sensor 12, a compressor refrigeration unit relay 14 and an electric heater SSR solid state relay 15; the PT100 temperature sensor 12 is used for monitoring the temperature in the high-temperature chamber 1 and inputting a temperature value to the PLC13 in the form of a 4-20mA current analog signal; the PLC13 carries out PID control on the on-off condition of the SSR solid state relay 15 of the electric heater according to the measured value and the set value of the temperature in the cabin, the PLC13 controls the on-off condition of the relay 14 of the compressor refrigerating unit according to the measured value and the set value of the temperature in the cabin, and the on-off conditions of different relays correspond to the on-off of the electric heater 8 and the on-off of the compressor refrigerating unit 7 because the relays are connected with corresponding electric equipment.
As shown in fig. 3, the humidity control system includes an ultrasonic humidifier 6, a rotary dehumidifier 5, a humidity sensor 2, a humidity controller 16, a humidifier relay 17 and a rotary dehumidifier relay 18; the humidity sensor 2 is used for monitoring the air humidity in the high-temperature chamber 1 and inputting a humidity value to the humidity controller 16 in the form of a 4-20mA current analog signal; the humidity controller 16 controls the on-off conditions of the humidifier relay 17 and the rotary dehumidifier relay 18 according to the measured value of the relative humidity in the bin and the set value of the relative humidity, and because each relay is connected with corresponding electric equipment, the on-off conditions of different relays correspond to the on-off of the ultrasonic humidifier 6 and the on-off of the rotary dehumidifier 5. When the ultrasonic humidifier 6 works, air containing water mist is directly sent into the bin, and when the rotary dehumidifier 5 works, part of air from the bin is sent into the bin after being adsorbed and dehumidified by the rotary wheel; the test results are input into the computer 28 in a unified manner.
In the test process of the multifunctional calibration type room calorimeter with the rotary dehumidifier, whether the compressor refrigerating unit 7 is started or not is determined by the PLC13 according to the temperature in the laboratory bin and the set temperature, and the PLC13 determines the heating quantity of the electric heater 8 by using the difference value between the temperature in the laboratory bin and the set temperature and adopting a PID algorithm. Two situations can occur in its control:
firstly, when the laboratory settlement temperature is less than ambient temperature or the difference between laboratory settlement temperature and ambient temperature is less than 10 ℃, compressor refrigerating unit 7 operation, electric heater 8 offsets the accurate control that realizes refrigerating output or heating capacity through part cold and hot to realize the purpose of temperature accurate control.
Secondly, when the difference between the set temperature of the laboratory and the ambient temperature is more than 10 ℃, the compressor refrigerating unit 7 does not operate, the electric heater 8 does not have cold and hot offset, and at the moment, the purpose of accurately controlling the temperature is realized only by accurately controlling the heating quantity of the electric heater 8.
In the invention, the laboratory adopts better heat preservation measures, the air in the cabin only circulates internally, and the air supply mode adopts orifice plate air supply, and the measures are mainly used for ensuring that the air temperature and the humidity in the high-temperature cabin and the low-temperature cabin are uniform and the air flow organization is reasonable. When the set temperature of the laboratory is 0 +/-5.0 ℃, in order to avoid the surface of an evaporator of a compressor refrigerating unit from frosting, the rotary dehumidifier 5 needs to be started in advance, and then the temperature control system is started, otherwise, the temperature control system is started firstly under the other conditions, and after the temperature in the laboratory chamber is close to the set temperature of the laboratory, the humidity control system is arranged and started, so that the temperature and the humidity in the chamber can be ensured to be stabilized in the required temperature and humidity range.
In the invention, the test room temperature and humidity control systems are all automatic control systems, after the set temperature and humidity are input, the system automatically controls and adjusts according to the change condition of the humidity value of the detected temperature according to the set control program, and manual intervention is not needed during the control and adjustment.
When the multifunctional calibration type room calorimeter with the rotary dehumidifier is used for the first time, a calibration test is sequentially carried out on the heat flow coefficient of the high-temperature cabin outer enclosure structure and the two-cabin middle enclosure structure according to the set working condition shown in the table 1, the total input power of the high-temperature cabin and the weighted average temperature difference of the inner surface and the outer surface of the high-temperature cabin enclosure structure are tested, a unitary linear equation of the total input power of the high-temperature cabin and the weighted average temperature difference of the inner surface and the outer surface of the high-temperature cabin enclosure structure is regressed by using a least square method, and the slope value of the unitary. The calibration result is used for a room air conditioner performance test and a building door and window or building material heat transfer coefficient test, and the heat leakage quantity of each part of the enclosure structure can be determined by calculating the weighted average temperature difference according to the tested high-temperature outside-bin enclosure structure and the two-bin middle enclosure structure by utilizing the calibration result. Under the condition that the change of the surrounding environment of the laboratory is not large, the calibration can be carried out once a year, and the calibration is not required to be carried out in each test.
TABLE 1 Heat flow coefficient calibration test conditions
When a building door and window heat transfer coefficient test and a room air conditioner performance test are carried out, the total input power of a high-temperature bin, the condensed water quantity of the tested device (if the tested device generates condensed water), the weighted average temperature difference of a high-temperature outer space enclosing structure and a high-temperature middle space enclosing structure are tested when the heat meter and the tested device or a test piece are in a balanced and stable state, and the refrigerating capacity (heating capacity) or the heat transfer capacity of the tested room air conditioner can be calculated by utilizing the heat transfer theory and heat balance principle. Completing the heat transfer coefficient test of the building door and window and the performance test of the room air conditioner
In conclusion, the invention expands the function of the traditional calibration room type calorimeter test room by adding the rotary dehumidifier, improves the performance of the test room and enables the test room to carry out more test items at the same time so as to reduce the construction cost and the test cost of the test room. The control range and the precision of the air temperature of the high-temperature bin are respectively 0-40 ℃ and +/-0.3 ℃, and any point in the temperature range is controllable and adjustable; the control range and the precision of the air temperature of the low-temperature bin are respectively-20-60 ℃ and +/-0.3 ℃, and any point in the temperature range is controllable and adjustable. When the temperature in the bin is higher than 0 ℃, the control range and the precision of the air humidity of the high-temperature bin and the low-temperature bin are 20-80 ℃ and +/-10%, and any point in the humidity range is controllable and adjustable. The relative humidity of the air in the bin can be kept lower than 20% under the normal temperature condition. On the premise of maintaining high-precision constant temperature and humidity, the temperature and humidity simulation range of a high-temperature cabin and a low-temperature cabin of a laboratory is improved to improve the performance of the laboratory and expand the functions, so that the control difficulty and the complexity of a test system are inevitably improved, and the temperature and humidity control precision of the air in the cabin can be ensured by using the temperature and humidity simulation device. The invention has great practicability and market value for detection mechanisms and colleges.
While the present invention has been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are illustrative only and not restrictive, and various modifications which do not depart from the spirit of the present invention and which are intended to be covered by the claims of the present invention may be made by those skilled in the art.

Claims (2)

1. A measurement method of a multifunctional calibration type room calorimeter with a rotary dehumidifier is disclosed, wherein the related multifunctional calibration type room calorimeter with the rotary dehumidifier comprises a laboratory main body structure, a temperature control system, a humidity control system, an automatic data acquisition system and a test system; the main structure of the test room comprises a high-temperature bin (1) and a low-temperature bin (4); a test piece frame is arranged on a partition wall between the high-temperature bin (1) and the low-temperature bin (4), the test piece frame comprises a reserved test frame (3) with the thickness of 1.5m multiplied by 1.5m and a reserved test frame (11) with the thickness of 1m multiplied by 2m, a guide plate (10) and a circulating fan (9) are arranged on one side, close to the partition wall, in the low-temperature bin (4), the guide plate (10) and the circulating fan (9) are used for simulating air flow on the outdoor side of a door and window, and the size of the air flow is adjusted by changing the distance between the guide plate (10) and the partition wall; a rotary dehumidifier (5), an ultrasonic humidifier (6) and a compressor refrigerating unit (7) are arranged on one side, far away from the partition wall, in the high-temperature bin (1) and the low-temperature bin (4); the test system comprises a PT100 temperature sensor (12), a refrigerant pressure sensor (20), a flowmeter (21), a heat flow sensor (22), transmitters, a data patrol instrument (27) and a computer (28), wherein the transmitters respectively output 4-20mA current signals correspondingly; when the performance test of the room air conditioner and the heat transfer coefficient test of building doors and windows or building materials are carried out, the arrangement positions and the number of corresponding temperature measuring points are correspondingly adjusted according to the test requirements; the temperature control system comprises an electric heater (8), a compressor refrigerating unit (7), a PLC (13), a PT100 temperature sensor (12), a compressor refrigerating unit relay (14) and an electric heater SSR solid-state relay (15); the PT100 temperature sensor (12) is used for monitoring the temperature in the high-temperature cabin (1) and inputting a temperature value to the PLC (13) in the form of a 4-20mA current analog signal; the humidity control system comprises an ultrasonic humidifier (6), a rotary dehumidifier (5), a humidity sensor (2), a humidity controller (16), a humidifier relay (17) and a rotary dehumidifier relay (18); the humidity sensor (2) is used for monitoring the air humidity in the high-temperature bin (1) and inputting a humidity value to the humidity controller (16) in the form of a 4-20mA current analog signal; when the ultrasonic humidifier (6) works, air containing water mist is directly sent into the bin, and when the rotary dehumidifier (5) works, part of air from the bin is sent into the bin after being adsorbed and dehumidified by the rotary wheel; the test results are input into the computer (28) in a unified way;
the method is characterized in that the method for measuring the multifunctional calibration type room calorimeter with the rotary dehumidifier comprises the following steps:
the PLC (13) performs PID control on the on-off condition of the SSR solid state relay (15) of the electric heater according to the measured value and the set value of the temperature in the cabin, and the PLC (13) controls the on-off condition of the relay (14) of the compressor refrigerating unit according to the measured value and the set value of the temperature in the cabin so as to start and stop the electric heater (8) and the compressor refrigerating unit (7);
the humidity controller (16) controls the on-off conditions of the humidifier relay (17) and the rotary dehumidifier relay (18) according to a relative humidity measured value and a relative humidity set value in the bin so as to start and stop the ultrasonic humidifier (6) and the rotary dehumidifier (5);
the method comprises the following specific steps:
through the PLC (13), whether the compressor refrigerating unit (7) is started or not is determined according to the temperature in the laboratory bin and the set temperature, and the PLC (13) determines the heating amount of the electric heater (8) by using a PID algorithm according to the difference value of the temperature in the laboratory bin and the set temperature;
when the set temperature of the laboratory is lower than the ambient temperature or the difference between the set temperature of the laboratory and the ambient temperature is less than 10 ℃, the compressor refrigerating unit (7) operates, and the electric heater (8) counteracts partial cold and heat to realize the control of refrigerating capacity or heating capacity;
when the difference between the set temperature of the laboratory and the ambient temperature is more than 10 ℃, the compressor refrigerating unit (7) does not operate, the electric heater (8) does not have cold and hot counteraction, and the heating amount of the electric heater (8) is controlled only; thereby realizing the purpose of temperature control;
when the set temperature of the laboratory is 0 +/-5.0 ℃, the rotary dehumidifier (5) is started firstly, and then the temperature control system is started, otherwise, the temperature control system is started firstly, and after the temperature in the laboratory chamber is close to the set temperature of the laboratory, the humidity control system is set and started, so that the temperature and the humidity in the laboratory chamber are stabilized in the required temperature and humidity range.
2. The measuring method of the multifunctional calibration type room calorimeter with the rotary dehumidifier according to claim 1, wherein in the first use, the heat transfer coefficient of the wall of the high-temperature chamber is calibrated according to the national standard requirements, and the calibration result is used for room air conditioner performance test and building door and window or building material heat transfer coefficient test.
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