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Programmable Environmental Temperature And Humidity Chamber Operation Note Points

Comparison of Advantages and Disadvantages of Various Humidification Methods in Environmental Chamber

The constant temperature and humidity chamber provides a specific environment for stability testing. The following four humidification methods are generally used:

1.Ultrasonic humidification
More common, and the cost is lower. A hole is opened in the side of the box, and the water is atomized by an ultrasonic humidifier, and the mist is introduced into the box through the water pipe. The characteristic is that the humidification speed is fast, but it is also easy to cause the instrument to frequently start dehumidification, and the water consumption is relatively large.

2. Shallow water tray humidification
There is a shallow water tray inside the box, which has an electric heating rod, and the water is heated to evaporate and humidify. It is characterized by a slower humidification rate, but the humidity changes little after stabilization.

3. Steam pot humidification
Steam is generated by heating the water to boiling and is humidified into the tank. The characteristic is that the humidity changes faster. However, the structure is more complicated and the failure rate is slightly higher.

4. Watering and humidification
Comparison of advantages and disadvantages of various humidification methods in constant temperature and humidity test chamber
When the constant temperature and humidity test chamber is being tested, the relative humidity of the constant temperature and humidity chamber should be adjusted according to the test requirements. Generally, there are four ways to adjust the relative humidity. They are: spray water humidification, steam humidification, shallow water tray humidification and supercooled steam humidification. These four methods have different humidification methods and principles, and each has its own effect. Below we will analyze their similarities and differences and advantages and disadvantages from several aspects.

Similarities and differences in humidification methods
Watering and humidification to the working chamber wall of constant temperature and humidity test chamber
Steam humidification steam boiler steaming water in a constant temperature and humidity test chamber
Shallow water tray humidification
The water in the hot plate is heated by the shallow water pan with the heating device installed in the constant temperature and humidity test chamber, and the water is added to the tank.
Cold steam humidification
Use water, high-pressure water mist, centrifugal spray, etc. to convert water into micron-sized water mist

Similarities and differences between humidification principles
Watering and humidification The wall area of ​​the constant temperature and humidity test chamber increases, and the water increases the relative humidity when the water diffuses into the tank.
Vapor humidification Spray water vapor directly into the constant temperature and humidity test chamber to increase the relative humidity inside the chamber.
Shallow water tray humidification The heated water in the shallow water tray increases the relative humidity by increasing the water vapor in the constant temperature and humidity test chamber by convection and diffusion.
Cold steam humidification
When the heat is obtained from the sample, it is converted into water vapor, and the humidity is raised. If no other heat is added, the water mist becomes water droplets.

Advantages of humidification
Watering and humidification
1. After the system is stable, the humidity fluctuation is small.

2. During the humidification process, the moisture is not too hot, and the heat of the constant temperature and humidity test chamber will not increase.
3, control the water temperature of the spray, can play the role of dehumidification.
Vapor humidification Humidification is rapid. Meet the need for rapid humidification during wet heat.
Shallow water tray humidification
1. After the system is stable, the humidity fluctuation is small.
2. During the humidification process, the moisture is not too hot, and the heat of the constant temperature and humidity test chamber will not increase.
3, control the water temperature of the spray, can play the role of dehumidification.
4. Humidification is rapid. Meet the need for rapid humidification during wet heat.
Cold steam humidification
Has the advantages of the first three ways.

Shortcomings of humidification
Watering and humidification
1. When spraying water, water will contaminate the test piece.
2. The humidification speed is slow and does not meet the needs of wet heat.
3. Water spray will increase the burden of water in the tank and increase the drainage pressure.
Vapor humidification Vapor humidification will increase the heat inside the box, which is not conducive to temperature control inside the box.
Humidification of shallow water trays Since the exchange of water pressure and convection have always existed, the humidity will always be increased into the constant temperature and humidity test chamber, and it is difficult to obtain a low humidity environment.
Cold steam humidification
Do not have the disadvantages of the first three methods

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