The constant temperature and humidity chamber is composed of control system, heating system, temperature system, etc. These systems are respectively related to electrical and mechanical refrigeration. The following describes the principle and working process of these systems.
1. The heating system of the equipment is relatively simple compared to the refrigeration system. It mainly consists of high-power electric resistance wire. Because the heating rate required by the test box is large, the heating system of the test box has relatively large power and is in the test box. The bottom plate also has a heater.
2. The temperature system of the constant temperature and humidity chamber is divided into two subsystems: humidification and dehumidification. The humidification method of the test box generally adopts the steam humidification method, that is, the low pressure steam is directly injected into the test space to humidify. This humidification method has good humidification ability, high speed, and sensitive humidification control (especially, it is easy to achieve forced humidification when cooling); dehumidification method of test box There are two types: mechanical refrigeration dehumidification and dry dehumidification.
3. The control system is the core of the comprehensive test chamber. It determines the important parameters such as the heating rate and accuracy of the test box. Most of the controllers of the test box now use PID control, and a small number of control modes using PID and fuzzy control are combined. The constant temperature oscillator is basically a category of software because the control system, and this part generally does not have problems during use.
The dehumidification principle of the mechanical refrigeration dehumidification of the constant temperature and humidity chamber 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; the dehumidification of the dryer is to extract the air in the test chamber by using the air pump. The dry air is injected while the humid air is sent to the recyclable drying for drying, and then dried and sent to the test chamber (such as repeated cycles for dehumidification).
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