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How to achieve the temperature and humidity of the constant temperature and humidity test box
Edit:2024 EUROPEAN CUP Network Department
Time:2022-09-21

The constant temperature and humidity test box is also called height and temperature intercourse damp heat test box,Can program constant temperature constant humidity test machine,Is aviation、Car、Home Appliances、Testing equipment and instruments in scientific research and other fields,Used for testing and determining electricians、Electronics and other products and materials for high temperature、Low temperature、Parameters after the temperature environment changes of humid heat or constant tests。

The working principle of the constant temperature and humidity box

 

The humidification method of the constant temperature and humidity test box is generally used in steam humidification,Infuse of low -pressure steam directly injects the test space to humidify。This humidification method is humidified,Fast speed,Schipids of humidification control,Especially when it is cooling, it is easy to achieve mandatory humidification。

There are two types of dehumidification methods: mechanical refrigeration, dehuminating and dry dehumidification。The principle of dehumidification of mechanical refrigeration and dehumidification is to cool the air below the dew point temperature,Makes the water vapor condensation greater than saturated and wet,This will reduce the humidity。Dryer dehumidification uses the air pump to pull out the air in the test box,and injected the dry air,At the same time, send the wet air into a circular use drying to dry,After drying, send it to the test box,Such a repeated cycle for dehumidification。

According to the test requirements,At the same time, humidity control is needed,The process is as follows:

Heating of the constant temperature and humidity box

 

The heating in the test box of the heating process in the heating test box of the constant temperature and humidity test box is mainly using high -power resistance wires,Due to the heating rate required by the test box, the heating rate is large,Therefore, the temperature system of the test box is divided into two subsystems: humidification and dehumidification;

The temperature of the constant temperature and humidity box

The cooling process of the constant temperature and humidity test box cooling process is cooling,The refrigeration method of the test box is mechanical refrigeration and auxiliary liquid nitrogen refrigeration,Mechanical refrigeration uses steam compressed refrigeration,They are mainly compressors,condenser,Composition of a throttling mechanism and an evaporator,The constant temperature and humidity test box If the temperature needs to be achieved, the temperature requires a lower -55 ℃ or below,Single -level refrigeration is difficult to meet the requirements,Therefore, the refrigeration method of the test box generally uses a folded refrigeration。

The humidification process of the constant temperature and humidity box

Wet test box wall spray water,Control the water surface saturated pressure through controlling water temperature。The water on the surface of the box wall forms a larger surface,Add the water vapor pressure to the box to the box in the box to increase the relative humidity in the box in the box to increase the relative humidity,This method appeared in the 1950s。Because the control of humidity at that time was mainly to use a mercury electroconductor conductive meter for simple switching and switching,Poor adaptability to the water temperature of the hot water tank that lags behind,Therefore, the transition process of control is longer,Can't meet the requirements of the amount of humidity and humidity of the humidity and humidity of the humidity and heat,More importantly, when spraying the box wall,Unavoidable water droplets are poured on the test products to form different degrees of pollution。

Now most of the constant temperature and humidity test box adopt the previous steam humidification method,The latter dehumidification method,It can make the dew point temperature below 0 ℃。If it is applicable to occasions with special requirements,The cost will be more expensive。

The dehumidification of the constant temperature and humidity box

There are two types of dehumidification methods of the test box: mechanical refrigeration, dehuminating and dry dehumidification。

1、The principle of dehumidification of mechanical refrigeration and dehumidification is to cool the air below the dew point temperature,Makes the water vapor condensation greater than saturated and wet,This will reduce the humidity。

2、Dryer dehumidification uses the air pump to pull out the air in the test box,and injected the dry air,At the same time, send the wet air into a circular use drying to dry,After drying, send it to the test box,Such a repeated cycle for dehumidification。

Now most of the constant temperature and humidity test box adopt the previous type of dehumidification method,The latter dry and dehumidification method,Need to increase dehumidifier or chemical dehumidification,It can make the dew point temperature below 0 ℃。Suitable for occasions with special requirements,The cost is also relatively high。

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