portable air purifier.Introduction to the System Composition of a Constant Temperature and Humidity Machine

　　1. Control system: including power supply and automatic control parts. The power supply part supplies power to compressors, fans, electric heaters, humidifiers, etc. through contactors. The automatic control part is also divided into temperature and humidity control and fault protection parts; Temperature and humidity control is achieved by comparing the humidity of the return air with the temperature set by the user through a temperature and humidity controller, and automatically running components such as compressors, humidifiers, and electric heating to achieve automatic control of constant temperature and humidity.

　　2. Humidity system: The humidity system is divided into two subsystems: humidification and dehumidification. The humidification method generally adopts the electrode humidification method, which uses the example of water to move and heat the water to boiling. The amount of water vapor generated is determined by the water level in the electrode tank, which is the depth or area of the electrode rod inserted into the water. The steam spray rod is evenly distributed in the air conditioning box or duct, and is absorbed by air to achieve the purpose of testing, The dehumidification method is mechanical refrigeration dehumidification. Its dehumidification principle is to cool the air below the dew point temperature, causing water vapor greater than the saturated moisture content to condense and precipitate, thereby reducing humidity.

　　3. Sensor system: The sensors mainly include temperature and humidity sensors, and temperature sensors are commonly used in platinum electric groups and thermocouples. There are two methods for measuring humidity: dry wet bulb thermometer and solid-state electronic sensor direct measurement method. Due to the low accuracy of wet and dry bulb measurement, current constant temperature and humidity boxes are gradually replacing wet and dry bulbs with solid-state sensors for humidity measurement.

　　4. Supply air circulation system: The air circulation system generally consists of a centrifugal fan and a motor that drives its operation. It provides the circulation of air in the constant temperature and humidity machine, and the spectrometer is responsible for sucking air from the return air outlet. The air passes through the evaporator, timer, and heater, and then is sent to the space required by the user through the supply air outlet. The sent air mixes with the air in the space and returns to the return air outlet.

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