Practice of humidification of rapid temperature rise and test machine

In order to complete the experimental conditions, the rapid rise and fall temperature test machine must not stop the operation of humidifying and dehumidifying the test machine. This paper intends to stop the analysis of various methods currently used in the damp heat test machine, and point out their respective excellent defects. And the conditions under which the initiative is applied.

There are many ways to express humidity. In the case of experimental equipment, the concept of relative humidity is usually used to describe humidity. Relative humidity is defined as the ratio of the water vapor pressure in the air to the saturated vapor pressure of water at that temperature and is expressed as a percentage. According to the characteristics of water vapor saturation pressure, the saturation pressure of water vapor is only a function of temperature. It is independent of the air pressure at which water vapor can be used. After a lot of experiments and finishing, people have found a relationship between water vapor saturation pressure and temperature, which has been engineering and A large amount of measurement should be adopted by the Goffeglie formula. It is used by the current climate department to prepare a humidity checklist.

The process of humidifying the rapid rise and fall temperature test machine is to improve the partial pressure of water vapor. The initial humidification method is to spray water to the test machine wall, and the water surface saturation pressure is controlled by controlling the water temperature. The water on the outer surface of the tank wall constitutes a larger surface, on which the water vapor pressure is applied to the tank in a diffused manner to increase the relative humidity in the test machine. This method was presented in the 1950s. Since the control of humidity at that time was mainly the use of mercury-electric contact type conductivity meter to stop simple switching regulation, the control of the water temperature of the hot water tank with large hysteresis was poor, so the transition process of control was long and could not meet the alternating heat and humidity. More demand for the amount of humidification, more importantly, when spraying the wall of the tank, it is impossible to prevent water droplets from dripping on the sample to constitute different levels of contamination of the sample. At the same time, there are certain requests for drainage inside the tank. Therefore, we used steam humidification and shallow water tray humidification in the early stage, although its control transition process is longer, but the humidity is shaken less after the system is stable, which is more suitable for constant damp heat test. In addition, the moisture does not heat up during the humidification process and does not increase the extra heat in the system.

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