The constant temperature and humidity test chamber is composed of a control system, a temperature system, and a heating system. These systems belong to electrical and mechanical refrigeration respectively. The following is a preliminary introduction to the principles and working process of these systems.
1. The control system is the core of the comprehensive test box, which determines the important indicators such as the temperature rise rate and accuracy of the test box. Most of the controllers of the test box now use PID control, and a small number use PID and fuzzy control combined control mode. Since the control system of the thermostatic oscillator basically belongs to the category of software, and this part generally does not cause problems during use.
2. Temperature system: divided into two subsystems: humidification and dehumidification
(1) Humidification: The humidification method of the test chamber generally adopts the steam humidification method, that is, the low-pressure steam is directly injected into the test space for humidification. This humidification method has good humidification capacity, fast speed, and sensitive humidification control (especially when the temperature is lowered, it is easy to realize forced humidification).
(2) Dehumidification: There are two dehumidification methods in the test chamber: mechanical refrigeration dehumidification and dry dehumidification.
The dehumidification principle of mechanical refrigeration dehumidification is to cool the air below the dew point temperature to condense and precipitate water vapor that is greater than the saturated moisture content, which reduces the humidity. The desiccant dehumidifier uses an air pump to draw the air in the test chamber to remove the dry air Simultaneously with the injection, the humid air is sent to the recyclable drying to dry, and after drying, it is sent to the test box (so repeated circulation to dehumidify). At present, most comprehensive test chambers use the former dehumidification method, and the latter dehumidification method can make the dew point temperature reach below 0 ℃, which is suitable for occasions with special requirements.
3. Heating system: The heating system of the constant temperature and humidity test chamber is relatively simple compared to the refrigeration system. It is mainly composed of high-power resistance wire. Due to the relatively large heating rate required by the test chamber, the power of the heating system of the test chamber is relatively Large, and the bottom of the test box is also equipped with a heater.
Introduce the principle of constant temperature and humidity test chamber system
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