Product Details
Working principle of constant temperature and humidity machine
Constant temperature and humidity machine consists of refrigeration system, heating system, control system, humidity system, air supply circulation system and sensor system The above systems are composed of two major aspects: electrical and mechanical refrigeration. The working principles and processes of several systems are described below.
. Refrigeration system: The refrigeration system is one of the key parts of the constant temperature and humidity machine. Generally speaking, the refrigeration methods are mechanical refrigeration and auxiliary liquid nitrogen refrigeration. Mechanical refrigeration uses vapor compression refrigeration, which mainly consists of a compressor, condenser, throttling mechanism and evaporator. The refrigeration system of the constant temperature and humidity machine consists of two parts, called the high temperature part and the low temperature part. Each part is a relatively independent refrigeration system. The evaporation of the refrigerant in the high-temperature part absorbs heat from the refrigerant in the low-temperature part, while the evaporation of the refrigerant in the low-temperature part absorbs heat from the object being cooled (the air in the testing machine) to obtain cooling energy.
.Heating system: The heating system is relatively simple compared to the refrigeration system. It is mainly composed of high-power resistance wire. Since the heating rate required by the test is relatively large, the power of the heating system is relatively large.
3. Control system: including power supply part and automatic control part.
The power supply part uses contactors to supply power to compressors, fans, electric aerators, humidifiers, etc. The automatic control part is divided into temperature and humidity control and fault protection parts. The temperature and humidity control is through temperature and humidity. The controller compares the temperature and humidity of the return air with the temperature and humidity set by the user, and automatically operates compressors (cooling, dehumidification), humidifiers, electric heating (warming) and other components to achieve automatic control of constant temperature and humidity
.Humidity system: The temperature system is divided into two subsystems: humidification and dehumidification.
The humidification method generally uses the electrode humidification method, which uses the movement of ions in the water to heat the water to boiling. The amount of water vapor generated (humidification amount) is determined by the water level in the electrode tank, that is, the amount of water vapor the electrode rod is inserted into the water. Depth or area, the steam spray rods are evenly distributed in the air conditioning box or air duct, and are absorbed by the air to achieve the purpose of humidification.
The dehumidification method is mechanical refrigeration dehumidification. The dehumidification principle is to cool the air below the dew point temperature, so that water vapor greater than the saturated moisture content condenses and precipitates, thus reducing the humidity.
.Sensor system: The sensors are mainly temperature and humidity sensors. The most commonly used temperature sensors are platinum electric groups and thermocouples. There are two methods for measuring humidity: wet and dry bulb thermometer method and solid-state electronic sensor direct measurement method. Due to the low measurement accuracy of the wet and dry bulb method, current constant temperature and humidity chambers are gradually using solid-state sensors instead of wet and dry bulbs to measure humidity.
.Air circulation system: The air circulation system generally consists of a centrifugal fan and a motor that drives it. It provides air circulation in the constant temperature and humidity machine. The fan is responsible for sucking the air from the return air outlet. The air passes through the evaporator (cooling, dehumidification), humidifier, and electric heater (heating) and then is sent to the space required by the user through the air supply outlet. Inside, the air sent out mixes with the air in the space and returns to the return air outlet.
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