The choice of cooling method for the three-slot thermal shock box of Ai Siwei should be determined according to the actual conditions of the laboratory. If conditions permit, the water cooling method should be preferred. However, if the selected test chamber has a small cooling system. It is also possible to give priority to the choice of water cooling.
1, wind speed
According to the relevant standards, the wind speed in the temperature and humidity chamber should be less than 1.7m/s when conducting environmental tests. For the thermal shock test box test itself, the wind speed is as small as possible. The wind speed is too high to accelerate the flow of the test piece and the flow inside the box. The heat exchange is unfavorable in the authenticity of the test. However, in order to ensure the uniformity of the test chamber, it is necessary to have circulating air in the test chamber. However, the rapid temperature change test chamber and the multi-factor comprehensive environmental test chamber such as temperature, humidity and vibration, in order to pursue the temperature change rate, the flow velocity of the circulating airflow in the tank must be accelerated, and the wind speed is usually 2 to 3 m/s. Therefore, the wind speed limit is different for different purposes.
2, temperature fluctuations
Temperature fluctuations are a relatively easy to implement parameter. The actual temperature fluctuations of most thermal shock test chambers produced by all environmental testing equipment manufacturers can be controlled within ±0.3 °C.
3, temperature field uniformity
In order to more accurately simulate the actual environmental conditions suffered by the product in nature, it is necessary to ensure that the periphery of the tested product is at the same temperature and environmental conditions in the environmental test. For this reason, the temperature gradient and temperature fluctuation in the test chamber must be Limit it. In the national military standard GJB150.1-86 military equipment environmental test method general provisions clearly stipulate "the temperature of the measurement system near the test sample should be within ± 2 ° C of the test temperature, the temperature of the work does not exceed 1 ° C / m or the total maximum It is 2.2 ° C (test sample does not work).
4, humidity precision control
Most of the humidity measured in the environmental test chamber is dry and wet ball method, and the manufacturing standard GB10586 is required. The relative humidity deviation should be ±23% RH. In order to meet the requirements of humidity control accuracy, the temperature control accuracy of the humidity test chamber is high, and the temperature fluctuation is generally less than ±0.2 °C. Otherwise it is difficult to meet the requirements of humidity control accuracy.
5, three-slot type thermal shock box cooling method selection
If the test chamber has a refrigeration system, the refrigeration system needs to be cooled. The thermal shock test chamber is available in both air-cooled and water-cooled versions.
Three-slot type hot and cold impact box air-cooled water cooling
The conditional device is easy to install and can be used only when the power is turned on. The ambient temperature should be lower than 28 °C. If the ambient temperature is higher than 28 °C, the cooling effect will be affected (preferably equipped with air conditioning).
Poor heat transfer (relative to water cooling) stable and good
The effect on the environment of use can cause the temperature of the air around the test chamber to rise. Does not affect the temperature around the test chamber.
The three-slot thermal shock box has a relatively large noise (relative to the water cooling method).
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