1. The heating principle of the constant temperature and humidity test chamber: the temperature rise in the constant temperature and humidity test chamber is mainly heated by high-power resistance wires. The temperature and humidity controller of the constant temperature and humidity test chamber firstly controls the required temperature. The temperature in the test chamber is sensed, and when the actual temperature is lower than the set temperature, the control gives a signal to control the output of the solid state relay, and the solid state relay controls the heating wire to work and heat, and the heat balance effect in the test chamber is achieved through the air circulation system.
2. Refrigeration principle of constant temperature and humidity test chamber: The refrigeration methods of constant temperature and humidity test chamber are mechanical refrigeration and auxiliary liquid nitrogen refrigeration. The constant temperature and humidity test chamber usually adopts mechanical refrigeration and vapor compression refrigeration. The condenser is composed of a throttling mechanism and an evaporator. First, the compressor compresses the refrigerant into a high-temperature and high-pressure liquid. After cooling by the condenser, the refrigerant becomes a high-pressure and normal-temperature liquid, and then throttling through the throttling device. After throttling, the refrigeration The agent is conducted to the evaporator. When the refrigerant passes through the evaporator, it takes away the temperature in the test chamber, so as to achieve the cooling effect.
3. Humidification principle of constant temperature and humidity test chamber: The process of humidifying the constant temperature and humidity test chamber is actually to increase the partial pressure of water vapor, and use steam humidification. The equipment is first controlled by the controller, and the sensor senses the humidity. When the actual humidity is lower than the set humidity When , the control gives a signal to control the output of the solid state relay, the solid state relay then controls the humidification of the humidification tube, and then uses the air duct circulation of the test chamber to circulate the hot air to the set humidity.
4. The constant temperature and humidity chamber is equipped with multiple protection measures; the temperature system is equipped with an over-temperature protector under the condition that the maximum safe allowable temperature can be set, and the air heating element can be automatically powered off when the rotating fan stops; the humidification system can be humidified with The power supply stops when the water level of the tank decreases; the refrigeration system also stops working as the temperature of the chamber rises (over 40°C) or the humidity increases :bilibili