As the name suggests, the low temperature test chamber is used for low temperature test. The refrigeration system of the low temperature test chamber can be said to be the most important one. Then the problem comes. Does the low temperature test chamber use liquid nitrogen refrigeration or compressor refrigeration when doing low temperature test refrigeration? What is the difference between the two?
There are three differences between the two: cooling mode, temperature range, and cooling rate.
One: The cooling method is different.
Liquid nitrogen refrigeration, generally using liquid nitrogen directly sprayed inside the test chamber, liquid nitrogen absorbs heat vaporization inside the test chamber, taking away heat to cool the test chamber; and compressor refrigeration, generally cooling the refrigeration system The device is designed in the test chamber. The refrigerant inside the evaporator is generally made of environmentally friendly refrigerant. The refrigerant passing through the throttling device evaporates and vaporizes inside the evaporator (not directly into the test chamber), absorbing heat from the periphery of the evaporator, and making the test chamber Cool down
Second: the temperature range is different.
For test environments where lower than -40 ° C - -195 ° C is required, liquid nitrogen refrigeration is usually selected; for test environments where less than 0 ° C - -80 ° C is required, the compressor cooling method is selected. There are many low temperature test chambers, because liquid nitrogen is consumable, and liquid nitrogen must be consumed every time the low temperature is obtained;
Three: The cooling rate is different.
The high-low temperature test chamber for liquid nitrogen refrigeration has a fast cooling rate. Considering the rapid temperature constant and overshoot problem, it is generally designed to be 10 °C/min. The high and low temperature test chamber for compressor refrigeration has high cost due to low temperature environment. The cooling rate is 1 ° C / min;
Through the above content, I believe that you have a general understanding of the refrigeration method of the low temperature test chamber. When we do the low temperature test, we should make the correct choice according to the requirements of the test. Only when the choice is correct, the effect will reach the most. it is good.
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