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Dehumidification principle of constant temperature and humidity test chamber

The principle of dehumidification of the constant temperature and humidity test chamber: When the refrigeration system is working, the temperature of the fins on the surface of the evaporator will be lower than the dew point temperature of the test temperature. When the air circulates, condensation will occur when moisture passes through the surface of the evaporator, thereby achieving the purpose of dehumidification. .

The definition of humidity refers to the ratio of the partial pressure of water vapor in the air to the saturated vapor pressure of water at that temperature and expressed as a percentage. It can be seen from the nature of water vapor saturation pressure that the saturation pressure of water vapor is only a function of temperature and has nothing to do with the air pressure where the water vapor can be.

People have found the relationship between water vapor saturation pressure and temperature through a lot of experiments and sorting out. Among them, the Gove Greche formula has been widely adopted by engineering and measurement. Customers often mention the humidity range of 0-100%. .RH, this is actually a wrong range value, 100% humidity can no longer be called humidity.

Because humidity refers to water mist and water vapor, and 100% humidity has completely formed water, and 0% humidity is already processing a completely dry environment (such as high temperature above 100 degrees, low temperature below 0 degrees), so The correct humidity range should be 30-98% Rh, if low humidity is required, it can be reduced to 10%, 20%.

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