To start with ,let's understand what's the frost of this Thermal Shock Chamber and where does it grow. Frost is the end result of the rapid heating of water from the atmosphere following the cold. Frost is a little ice crystal. When the frost is thick, it is easy to turn into thick ice .
The frost in the thermal shock chamber grows in the storage module of the pre cooling zone. Why does the frost has to be removed always?
We know that the Thermal Shock Test Chamber exchange the heat by airflow transition between three boxes to achieve the impact effect.
The three boxes are insulated from the air outside the box. In other words, the three boxes are closed relative to the outside world. Since it is confined space, the water content is quantitative，theoretically，there should not have frost in The pre cooling zone. But Where does the water from？
Only test zone can be opened by customer, product placement. To introduce water, It's only possible after the test area opens.
So one of the sources of water is from every time of the door opening.
When We do a full impact test，the door is not allowed to open halfway. Otherwise the test will fail.
Now do you understand why the frost has to be removed before use the Temperature Shock Test Chamber, hope that will be helpful.
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