High and low temperature test box acceptance test method:
First, the main test equipment and devices:
1.1 Anemometers: Anemometers with an induction of not less than 0.05m/s
1.2 Thermometer: A temperature measuring system composed of platinum resistance, thermocouple or other similar temperature sensor and meeting the following requirements: sensor time constant: 20S~40S; expanded uncertainty of temperature measurement system (K=2): not more than 0.4 °C
1.3 Surface thermometer: Measurement system made of platinum resistance or other similar sensors and meeting the following requirements: sensor time constant: 20S~40S; expanded uncertainty of temperature measurement system (K=2): no more than 1.0°C
Second, test conditions
2.1 Test under no-load conditions
2.2 When the cooling rate test is conducted, the ambient temperature should not be higher than 25°C, and the cold power temperature should not be higher than 30°C.
Third, the temperature test method
3.1 Location and number of test points
3.1.1 in the test chamber studio content set the upper, middle and lower level test surface, referred to as the upper, middle and lower layers, the distance between the upper layer and the top surface of the studio is 1/10 of the height of the studio, the middle layer through the studio At the center of the geometry, the lower layer is 10mm above the lowest sample holder.
3.1.2 The test points are located on three test surfaces. The center test point is located at the geometric center of the studio. The distance from the rest of the test points to the workroom wall is 1/10 of the length of each side, but it is less than 1 cubic meter for the working chamber. Test box, the distance is not less than 50mm
3.1.3 The relationship between the number of test points and the size of the working chamber is: when the working chamber volume is no more than 2 cubic meters, the test point is 9; when the working chamber volume is more than 2 cubic meters, the testing point is 15; when the working room When the volume is more than 50 cubic meters, the number of temperature test points can be increased appropriately
Fourth, the test program
4.1 Select the highest nominal temperature and the lowest nominal temperature within the adjustable range of the test chamber temperature
4.2 The test box is operated according to the procedure of high temperature after the first low temperature. The temperature at the center point of the working space reaches the test temperature and is stable at 2H. The temperature of all the test points is tested at the first minute in 30 minutes for a total of 30 times.
V. Data Processing and Test Results
5.1 The measured temperature data is corrected according to the test meter's correction value
5.2 Remove suspicious data
5.3 Calculate the average temperature of each measured value at 30 points for the data measured at the constant temperature stage
5.4 Calculate Temperature Gradient: Maximum Temperature Average minus Minimum Temperature Average
5.5 Calculate temperature fluctuations and temperature deviations
5.6 The difference between the set value of the test box control instrument and the central test value shall meet the tolerance requirement.
Sixth, the test method of the temperature difference between the working room wall and the working space
6.1 Location and Quantity of Test Points
6.1.1 Place a temperature sensor in the center of the workspace, and place a surface temperature sensor in the geometric center of the inner wall of the six sides of the studio.
6.1.2 If there is a lead hole or other device in the center of the working room wall, the distance between the test point and the hole wall or other device should not be less than 100mm
6.2 Test Procedure
6.2.1 In the adjustable range of the test chamber temperature, the highest nominal temperature and the lowest nominal temperature are used as the test temperature
6.2.2 The temperature at the geometric center point of the working space reaches the test temperature for the first time and is stable at 2H. The temperature values ​​of all the test points are tested every 2 minutes for a total of 5 times.
6.3 Calculation and Evaluation of Test Results
6.3.1 Correct the test temperature according to the test meter's correction value
6.3.2 Calculate the arithmetic mean of each test point temperature
6.3.3 Calculate the percentage difference between the thermodynamic temperature of the Studio Siberian wall and the studio
Seven, rising, cooling rate test methods
7.1 test point is the geometric center of the workspace
7.2 Test Procedure
7.2.1 Within the adjustable range of test chamber temperature, select the lowest nominal temperature as the minimum specified temperature and the highest nominal temperature as the highest specified temperature
7.2.2 Open the cold source, reduce the test chamber from room temperature to the minimum specified temperature, stabilize 2H, adjust to the maximum specified temperature, and measure the temperature of the test chamber from 10% to 90% of the temperature range; make the test chamber at the highest level At temperature, stable 2H, and then transferred to the minimum specified temperature, test chamber temperature from 90% of the temperature range down to 10% of the time.
7.2.3 Record temperature value once every 1 minute during heating or cooling process
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