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VACUUM ›› 2025, Vol. 62 ›› Issue (5): 1-10.doi: 10.13385/j.cnki.vacuum.2025.05.01

• Vacuum Technology Application •     Next Articles

Study on the Characteristics of Water Evaporation, Air Temperature and Humidity Change During Vacuuming Process

ZHANG Zhihua, LI Xiaolin, YANG Jia, ZHONG Jiabei, ZHANG Penglei   

  1. College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2024-12-11 Published:2025-09-29

Abstract: In the process of vacuuming a chamber with water inside, the moisture content of the air increases sharply due to the rapid evaporation of the water under low pressure. The thin air with excessive moisture content enters the vacuum pump and precipitates a large amount of condensate during the pressurization process, which may cause the emulsification of lubricating oil and damage the vacuum pump. Therefore, it is crucial to study the evaporation characteristics of the water and the characteristics of air temperature and humidity changes during the vacuuming process. In this paper, a small vacuum test bench was established, and the changes of air temperature and humidity during the vacuuming process under different pumping flow rates and water surface areas were studied. It was found that the changes of air temperature are mainly affected by the pumping flow rate, and the changes of air moisture content are mainly affected by the water evaporation area. Then, a mathematical model of air heat and moisture transfer in the vacuuming process was established by comprehensively using the correlation formula of mass conservation, energy conservation and mild evaporation, and considering the influence of heat leakage gas leakage, and the accuracy of the model was verified by experimental results. The model was finally used to predict the variation law of air temperature and humidity under different initial temperature and relative humidity of air during vacuuming process in a practical project, and the dynamic refrigeration capacity was obtained.

Key words: vacuuming, air temperature and humidity, mild evaporation, refrigeration capacity

CLC Number:  TB79

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