The working principle of a constant temperature and humidity machine

　　The operation of a constant humidity machine system is achieved through three interconnected systems: refrigerant circulation system, air circulation system, and electrical automatic control system; The working principle of the constant temperature and humidity testing machine is that its refrigeration cycle adopts the inverse Karoo cycle, which is composed of two isothermal processes and two adiabatic processes. Its refrigeration system is composed of French original fully enclosed compressors and uses balanced temperature control (BTC). When the refrigeration system operates continuously, the control system will control the output of the heater through PID automatic calculation based on the set temperature point, ultimately achieving a dynamic balance.

　　Due to the wide range of applications of constant temperature and humidity testing machines, their position in the environmental testing industry is also extraordinary. As the saying goes, learning is endless. In order to make the equipment bigger and stronger, we need to be familiar with its working principle. The above is also something that everyone must master.

　　The working system of the constant temperature and humidity test chamber consists of six new systems, including humidity system, sensor system, and refrigeration system. Mainly providing complex high and low temperature alternating and constant temperature heating test conditions and environments for product research and development, production, and inspection, suitable for industries such as household appliances, scientific research, and rubber. Therefore, the normal operation of the six systems is indispensable. Below is a preliminary description of the working principles and processes of several major systems.

　　1) Heating system: The heating system of the constant temperature and humidity test chamber is relatively simple compared to the refrigeration system. The heating system of the test box has a relatively high power, and there is also a heater on the bottom plate of the test box.

　　2) Refrigeration system: The refrigeration system is one of the key components of the comprehensive test box. The refrigeration system consists of two parts, namely the high-temperature part and the low-temperature part, each of which is a faulty refrigeration system.

　　3) Control system: The control system is the core of the comprehensive test box, which determines important indicators such as the heating rate and accuracy of the test box. Most controllers nowadays use PID control.

　　4) Humidity system: The temperature system is divided into two subsystems: humidification and dehumidification. The humidification method generally adopts steam humidification, which means that low-pressure steam is directly injected into the test space for humidification. There are two dehumidification methods: mechanical refrigeration dehumidification and dry dehumidification.

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