The principle of defrosting during the test of constant temperature and humidity box
The constant temperature and humidity box is used to test and determine the parameters and performance of electrical, electronic and other products and materials after high temperature, low temperature, alternating humidity and humidity or constant test temperature environment changes. In the process of testing the product performance, the constant temperature and humidity box needs to perform an essential operation, which is the defrosting step. What is the function of defrosting? Why does the constant temperature and humidity chamber defrost during the test? How to defrost?
The frost body in the constant temperature and humidity chamber is a small ice crystal that changes after cooling in the water in the air. But the frost to be defrosted in the constant temperature and humidity box is mainly on the storage components in the pre-cooling zone. The constant temperature and humidity box is mainly composed of three mutually auxiliary boxes. The airflow inside the box is mutually converted for heat exchange, but the air in these three boxes is isolated from the air outside the box and is sealed. Because the three boxes are sealed, the moisture in the box is quantitative. In theory, it will not increase the moisture to form a frost body. So where did these excess moisture come from?
Where does this water come from? It's not difficult to know. During the test, the user opens the door of the constant temperature and humidity box, and the air will enter the box. Therefore, it is not allowed to open the door of the constant temperature and humidity box during the test, which will not only increase the frost body, but also affect the authenticity of the test data, and may also cause unnecessary failures to the box during the test.
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