Condensation in high and low temperature test

In the high and low temperature test, the phenomenon of product condensation sometimes occurs, mainly because the ambient temperature of the high and low temperature test box increases during the high and low temperature test, and the surface temperature of the thermal inertia product is lower than the temperature of the test environment, thus forming hot and humid ambient air The surface of the product below the dew point causes water vapor to condense into dew drops on the surface of the product.

In addition, if the product is in a sealed state, when the high and low temperature test chamber is cooled, the temperature of the inner wall of the product shell cools faster than the temperature in the cavity, and the hot and humid air in the cavity will also condense into dew drops on the inner wall of the product shell. And because most products are not completely sealed, condensation usually occurs during the heating phase.

Condensation is related to the material used in the product, the size of the cavity, the rate of temperature rise and fall, and the relative humidity. The poorer the material absorbs heat, the larger the cavity, the faster the temperature rises and falls, and the greater the relative humidity, the stronger the condensation effect. Any condition that destroys the conditions for condensation to occur can prevent condensation from occurring.