The above mainly introduces the working conditions of various components in the equipment when the constant temperature and humidity test box is tested at a temperature above 89 degrees. Now we will explain the control method and humidity control method when the test temperature is below 89 degrees. How to control the internal temperature and humidity of the constant temperature and humidity test chamber? (2)
The constant-temperature and constant-humidity test box is used to generate heat through the solid-state relay on one side; the other is to achieve dynamic balance through the cooling cycle of the compressor refrigeration; make the temperature inside the box constant.
Cooling is the main link of the constant temperature and humidity test chamber, and is an important parameter to determine the performance of a constant temperature and humidity machine. It includes four parts: compressor, condenser, throttle device, and evaporator.
The compressor is the heart of the refrigeration system. It sucks low-temperature and low-pressure gas, turns it into high-temperature and high-pressure gas through the expansion valve, releases heat through condensation into liquid, and takes away heat through the fan. Therefore, the hot air is the reason below the constant temperature and humidity machine, and then throttles to In order to pressurize the liquid, it becomes low-temperature and low-pressure gas through the evaporator, and finally returns to the compressor; the refrigerant absorbs heat in the evaporator to complete the gasification process and absorbs heat to achieve the purpose of cooling, and completes the temperature-reducing process of the constant temperature and humidity machine.
The humidification system of the constant temperature and humidity test chamber is roughly the same as the heating system; it is the process of the heater heating water into steam; the purpose of humidification by the constant temperature and humidity machine is completed.
The dehumidification system of the constant temperature and humidity test chamber is also completed by the refrigeration system. The evaporator is placed in the constant temperature and humidity machine; it is relatively cold. The high humidity gas in the constant temperature and humidity machine meets the cold objects and condenses into a liquid; so the high humidity of the box is repeated There will be little gas to achieve the purpose of dehumidification.
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