Temperature and humidity control principle of constant temperature and humidity test chamber

The constant temperature and humidity test chamber, as the name implies, realizes the environmental conditions: temperature and humidity. But how to achieve the temperature and humidity you need? At the time of purchase, attention should be paid to the temperature and humidity control method of the test box, whether it has the ability to heat, cool, humidify, and dehumidify.

The heating system is the key to controlling whether the constant temperature and humidity test box is heated; it is the controller that outputs a voltage to the relay when the temperature is commanded, and about 3-12 volts of direct current is added to the solid state relay; its AC terminal is equivalent to the connection of the wire ; The contactor also pulls in at the same time, there is a voltage at both ends of the heater to make it heat, and the heat is brought into the box by the circulation fan, so that the constant temperature and humidity box is heated, and the temperature quickly reaches your set value; the controller In the solid state relay on and off adjustment; we look at the test box to see how much heating is on the screen to adjust the calorific value; this is temperature control above 89 degrees, how to control the temperature stability below 89 degrees? The constant temperature and humidity machine is how much heat is output through the solid state relay on one side; the other is to achieve dynamic balance through the cooling cycle of the compressor refrigeration cycle; the temperature is constant.

Cooling is an important parameter to determine the performance of a constant temperature and humidity test chamber. It includes four components: compressor, condenser, throttle device, and evaporator. The compressor is the heart of the refrigeration system. It sucks low-temperature and low-pressure gas into high-temperature and high-pressure gas, releases heat through condensation into liquid, and takes away heat through the fan, so the hot air is below the test chamber, and then throttled to low-pressure liquid, followed by The evaporator becomes a low-temperature and low-pressure gas 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 cooling process of the constant temperature and humidity experiment box.

The humidification system is almost the same as the heating system; it is the process of heating the water into steam through the heating tube; the purpose of humidifying the test box is completed.

The dehumidification system is also completed by the refrigeration system. The evaporator is placed in a constant temperature and humidity test box; it is relatively cold, and the high humidity gas in the test box encounters cold objects to condense into a liquid; so the high humidity gas in the box will be very little To achieve the purpose of dehumidification.

The above is the temperature and humidity control principle of the YSL constant temperature and humidity test box, I hope it will help you to understand the constant temperature and humidity test box further.

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