The Ai Siyu linear constant temperature and humidity humidification system is a crucial component in environmental testing chambers. Over time, the humidification method has evolved from traditional spray humidification used in boiler systems to more advanced shallow humidification techniques. This article will focus on the spray humidification method used in linear constant temperature and humidity chambers, discussing its advantages and disadvantages.
Advantages of spray humidification in linear constant temperature and humidity chambers:
The spray humidification process tends to be slower during the transition phase, but once the system stabilizes, the humidity fluctuations are minimal, making it ideal for constant damp heat testing. Additionally, this method does not introduce extra heat into the system during the humidification process. Moreover, when the temperature of the spray water is controlled to be lower than the dew point required for the test, the spray can also have a dehumidifying effect, which helps maintain precise humidity levels.
Disadvantages of spray humidification in linear constant temperature and humidity chambers:
Historically, humidity control relied on basic mercury-electric contact type conductivity meters, which had limited accuracy. Controlling the temperature of the hot water tank was challenging due to its large hysteresis, leading to long control transitions that could not meet the demands of alternating high and low humidity conditions. Furthermore, spraying near the chamber walls often resulted in water droplets falling onto the test samples, causing contamination. Drainage inside the chamber also needed to be carefully managed. These limitations led to the gradual replacement of spray humidification with steam humidification and shallow pan humidification methods.
In essence, the humidification process involves increasing the partial pressure of water vapor. Initially, water was sprayed onto the walls of the linear constant temperature and humidity chamber, with the water surface saturation pressure controlled by adjusting the water temperature. The water on the tank walls created a large surface area, allowing water vapor to diffuse into the chamber and increase the relative humidity within the test environment.
As technology advances, modern humidification systems offer better precision, faster response times, and reduced risk of sample contamination. Understanding the evolution of these systems helps in selecting the most appropriate method based on specific testing requirements and environmental conditions.
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