First, the constant temperature and humidity test chamber heating process The temperature rise in the test chamber is mainly the use of high-power resistance wire, because the test chamber requires a higher heating rate, so the test chamber temperature system is divided into two subsystems of humidification and dehumidification;
Second, the constant temperature and humidity test chamber cooling process cooling is cooling, the cooling method of the test box is mechanical refrigeration and auxiliary liquid nitrogen refrigeration, mechanical refrigeration using vapor compression refrigeration, they are mainly by compressor, condenser, throttling mechanism and evaporation The composition of the constant temperature and humidity test chamber If the temperature requirement of the large cabinet is as low as -55 °C or below, the single-stage refrigeration is difficult to meet the requirements. Therefore, the cooling method of the test box generally adopts cascade cooling.
Third, the constant temperature and humidity test chamber humidification process constant temperature and humidity test chamber humidification process is actually to increase the water vapor pressure, the initial humidification method is to spray water to the constant temperature and humidity test chamber wall, by controlling the water temperature to make the water surface saturation pressure control. The water on the surface of the tank wall forms a large surface, on which water vapor pressure is added to the tank to diffuse the relative humidity in the test chamber. This method appeared in the 1950s. Because the control of humidity at that time is mainly a simple switchover adjustment of the mercury-electric contact type conductivity meter, the control of the water temperature of the hot water tank with large hysteresis is poor, so the transition process of the control is long and cannot meet the alternating heat and humidity. The need for more humidification, and more importantly, when spraying the wall of the tank, it is inevitable that water droplets will drip on the sample to form different degrees of contamination on the sample.
4. Constant temperature and humidity test chamber Dehumidification process test chamber has two kinds of dehumidification methods: mechanical refrigeration dehumidification and dry dehumidification. 1. The principle of dehumidification of mechanical refrigeration dehumidification is to cool the air below the dew point temperature, so that the water vapor larger than the saturated moisture content is condensed and precipitated, thus reducing the humidity.
2. Dehumidifier of the dryer uses the air pump to pump out the air in the test chamber, and injects the dry air. At the same time, the humid air is sent to the recyclable dry for drying, and then dried and sent to the test chamber. Dehumidification is carried out. Most of the constant temperature and humidity test chambers now use the former dehumidification method. The latter dehumidification method requires an additional dehumidifier or chemical dehumidification to achieve a dew point temperature of 0 °C. Suitable for occasions with special requirements, but at a relatively high cost.
Qingsheng Testing Equipment Co., Ltd. is Dongguan Qingsheng Testing Equipment Co., Ltd. It is a company specializing in the design, development, installation and construction of ISO high-precision constant temperature and humidity laboratory. It also operates laboratory equipment and laboratory furniture products. After years of unremitting efforts, our company has acquired the comprehensive strength of investment plan demonstration, engineering drawing design, equipment selection, project implementation management and continuation service, and developed a computer automatic of the new generation ISO constant temperature and humidity laboratory. The control system also has its own technology center to provide customers with highly professional full-process services.
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