Refrigeration system: One of the key parts of this systemic constant temperature and humidity test chamber. The general refrigeration system has two refrigeration methods, mechanical refrigeration and auxiliary liquid nitrogen refrigeration. The so-called mechanical refrigeration is a refrigeration method using vapor compression. The main components of the group are: compressor, condenser, throttle mechanism and evaporator. Because the temperature and low temperature of our test must reach -55 ℃, single-stage refrigeration is difficult to meet the requirements, so the cooling method of the test box generally uses cascade refrigeration.
The core part of the constant temperature and humidity test chamber: the control system. Some important indicators such as heating rate and temperature display accuracy are controlled by the control system. In the whole machine, the software system of the control system sentence machine, so in the process of operation, generally no failure.
Heating system: The constant temperature and humidity test chamber has a cooling and heating system, but compared to the cooling system, the heating system is relatively simple. The main component is the high-power resistance wire. Due to the large heating rate required by the test box, the heating system power of the test box is relatively large, and a heater is also provided on the bottom plate of the test box.
Temperature system: It consists of two parts: humidification and dehumidification. The humidification system uses the steam humidification method, which is to inject low-pressure steam directly into the test space for humidification. The advantage of this method is that the humidification capacity is fast, the humidification control is sensitive, and it is easy to realize forced humidification especially when the temperature is lowered. The dehumidification method can also be divided into two parts: mechanical refrigeration dehumidification and dry dehumidification. Mechanical dehumidification is to cool the air below the dew point temperature, so that water vapor that is greater than the saturated moisture content is condensed and precipitated, which reduces the humidity. Drying and dehumidification is to use the air pump to draw out the air in the test box, and inject the dry air, and at the same time send the wet air into the recyclable drying to dry, and then send it into the test box after drying, and so on Dehumidify. Although there are two methods of dehumidification, most people now choose the former method in order to save costs. The latter method generally costs more. If it is below 0 degrees, you can consider the latter method.
Sensor: It is mainly used to measure temperature and humidity. It is generally made of metal with relatively fast thermal conductivity. The lighter the weight, the faster the thermal conductivity and the lower the cost. The more popular it is.
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