The constant temperature and humidity test chamber humidification system is one of the main systems. The humidification method has also been humidified by the previous spray humidification in the boiler to the advanced shallow humidification. Now, this chapter talks about the advantages and disadvantages of spray humidification:
The advantages of spray humidification in constant temperature and humidity test chamber The transition process of spray humidification is longer, but the humidity fluctuation is small after the system is stable, which is more suitable for constant damp heat test. In addition, the moisture in the humidification process does not increase the extra heat in the system. Also, when the temperature of the spray water is controlled to be lower than the point temperature required for the test, the spray water has a dehumidification effect.
The disadvantage of spray humidification in constant temperature and humidity test chamber is that the control of humidity at that time is mainly a simple switchover adjustment of the mercury electric contact type conductivity meter, which has poor adaptability to the control of the water temperature of the hot water tank with large hysteresis, so the control is controlled. The transition process is long, and it can't meet the requirement that the alternating humid heat requires more humidification. More importantly, when spraying on the tank wall, water droplets will inevitably drip on the sample to form different degrees of pollution on the sample. . At the same time, there are certain requirements for the drainage inside the tank. This method was quickly replaced by steam humidification and shallow water pan humidification.
The process of humidification is actually to increase the partial pressure of water vapor. The initial humidification method is to spray water to the wall of the constant temperature and humidity test chamber, and the water surface saturation pressure is controlled by controlling the water temperature. The water on the surface of the tank wall forms a large surface on which water vapor pressure is added to the tank by means of diffusion to increase the relative humidity in the test chamber.
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