Constant temperature and humidity box heating and cooling rate measurement need to be carried out under full load conditions, heating and cooling rate: the average rate of change every 5min is 5 ± 1 °C / min or the highest average rate of change of the test chamber. The test point is defined as the geometric center of the workspace.
Constant temperature and humidity box heating and cooling rate test program:
In the adjustable range of the test chamber temperature, the lowest nominal temperature is selected as the lowest temperature drop temperature, and the highest nominal temperature is the highest temperature increase temperature.
Open the cold source, make the test chamber from the room temperature to the minimum temperature drop temperature, at least 3h, after the rise to the maximum temperature, at least 3h and then dropped to the minimum temperature drop. During warming and cooling, records are made every minute until the end of the test.
Calculation and evaluation of test results;
The measured temperature value is corrected according to the test meter's correction value;
Calculate the temperature according to the formula of 5.5.4.2 of GB11158, the rate of change shall comply with the requirements of 4.1.7.
Inspection and evaluation of the sealing performance of the refrigeration system: Check the sealing of the piping joints of the refrigeration system with halogen lamps or soap and water. If there is no leakage, comply with the requirements of 4.2.3.
Insulation performance testing and assessment methods:
This test was conducted during the heating and cooling test. When the test chamber reached the maximum test temperature and stabilized for 3 hours, the surface temperature of the test chamber was checked with a surface thermometer, the observation window frame, and other accessible parts, if not higher than 50°C. Under low temperature conditions, when the ambient temperature is 30 to 35°C and the relative humidity is 75% to 85%, there should be no obvious condensation phenomenon on the outer wall of the box, the door, and the seal.
When the test box reaches the minimum test temperature and is stable for 3 hours, the condensation on the outer wall of the box and the seal of the door is observed with the naked eye, such as no obvious dew or water film condensation phenomenon.
The above temperature and humidity box heating and cooling rate test method was taken from GB10592-89 high and low temperature test box standard. The requirements of this standard are relatively high. If only the requirements of GB/T 2423.1-2008 and GB/T 2423.2-2008 are met, the lifting and cooling rate shall be: 1 to 3 degrees/min, and 0.7 to 1 degrees/min. .
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