The constant temperature and humidity test chamber is suitable for the performance change of electronic products and materials in the temperature environment of low temperature, high temperature and alternating damp heat. Then, what is the principle of wet heat replacement, which determines the damp heat?
When the constant temperature and humidity test chamber is tested, when the air collides with the water surface, heat and moisture exchange occurs with the open water surface. The difference in water temperature can result in two situations, one is that only sensible heat exchange occurs, and the other is that sensible heat exchange may occur, and wet exchange may occur, and latent heat exchange may occur.
The sensible heat exchange occurs because there is a temperature difference between the water and the air, and heat is exchanged due to the effects of convection, heat conduction and radiation. The result of the evaporation of water vapor in the air to absorb the latent heat of vaporization produces latent heat exchange.
The contact between the water surface and the air, due to the air close to the water surface, will result in a saturated air boundary layer as a result of the irregular movement of water molecules, at which time its temperature will be equal to the temperature of the water surface. The saturated air temperature of the boundary layer determines the concentration of water vapor molecules or the pressure of water vapor.
It can be seen that the sensible heat exchange of the constant temperature and humidity test chamber is determined by the temperature difference between the boundary layer and the air above it. The difference in concentration or partial pressure difference between the water vapor molecules determines the latent heat exchange.
Best Single Electric Breast Pump,Advanced Single Electric Breast Pump,Top Breast Pumps,Single Breast Pump
Joystar Electrical Appliances Manufacturing Co.,Ltd , https://www.cnjoystar.com