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. From the nature of the saturation pressure of water vapor, the saturation pressure of water vapor is only a function of temperature, and it has nothing to do with the air pressure where water vapor can be. Through a lot of experiments and sorting, we have found the relationship between the saturation pressure of water vapor and the temperature. Among them, Goffler ’s formula has been widely adopted in 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 droplets, 0% humidity has It is to deal with 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 you want to do low humidity can be reduced to 10%, 20%.
The dehumidification principle of the high and low temperature 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 the moisture passes through the surface of the evaporator, so as to achieve the purpose of dehumidification.
Attachment: High-low temperature test chamber wet-heat alternating principle:
When the air in the test box passes through the open water surface, heat and moisture exchanges occur with the water surface. Depending on the water temperature, only sensible heat exchange may occur, or both sensible heat exchange and wet exchange may occur, as well as latent heat exchange. When the air in the water is in direct contact with the water surface, as a result of the irregular movement of water molecules close to the water surface, a saturated air boundary layer with a temperature equal to the water surface temperature is formed, and the concentration of water vapor molecules or the partial pressure of water vapor depends on The saturated air temperature of the boundary layer.
If the concentration of water vapor molecules in the test chamber is greater than the concentration of water vapor molecules in the air above it (that is, the partial pressure of water vapor in the boundary layer is greater than the partial pressure of water vapor in the air), the number of water vapor molecules in the air will increase; otherwise, it will decrease . The former is called "evaporation" and the latter is called "condensation". In the evaporation process, the reduced water vapor molecules in the boundary layer are replaced by the water molecules jumping out of the water surface. During the condensation process, too many water vapor molecules in the boundary layer It will return to the water surface, which shows that the sensible heat exchange between air and water depends on the temperature difference between the boundary layer and the air above it, and the moisture exchange and the latent heat exchange caused by it depend on the water vapor molecules between the two. Difference in concentration or partial pressure.
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