Temperature and Humidity Control Strategy of Certain Subway Power Distribution Cabinet Based on COMSOL Multiphysics Software
Journal Title: Urban Mass Transit - Year 2025, Vol 28, Issue 4
Abstract
［Objective］ PDC (power distribution cabinet) operating in the high temperature and high humidity environment of the Yangtze River Basin are prone to internal condensation under the influence of the natural environment, resulting in equipment moisture and failure. To avoid PDC failure caused by condensation, it is necessary to analyze the formation mechanism of condensation and study the temperature and humidity control strategy of PDC. ［Method］ Based on the distribution cabinet failure caused by condensation, the mechanism and main influencing factors of condensation phenomenon are analyzed. Taking PDC in the subway power distribution room of a city in Central China as an example, COMSOL Multiphysics simulation software is used to build a full-scale multi-physics field coupling simulation model of PDC. Based on the historical data of environmental measurement and control, a simulation is carried out to analyze the impact of PDC internal temperature and humidity changes on the condensation phenomenon inside. Based on the data from 2022, the condensation probability of each month under natural conditions is statistically analyzed, and the temperature and humidity control strategy for PDC is proposed in combination with the simulation calculation results, and the control effect is analyzed through simulation calculation. ［Result & Conclusion］ Condensation is closely related to relative humidity and dew point temperature. The probability of condensation is highest in June and July, and it is most likely to occur from midnight to early morning after nightfall. Increasing the air conditioning setting temperature in the power distribution room and lowering the relative humidity of the environment can significantly reduce the probability of condensation in PDC. The specific control strategy is: when the air conditioning is cooling in summer, the air conditioning temperature in the power distribution room should not be set lower than 26 ℃: adding a dehumidifier in the power distribution room could reduce the relative humidity of the environment to 75% or below. The simulation results verify that the temperature and humidity control strategy has a good anti-condensation effect.
Authors and Affiliations
Lei DENG, Guanglei CUI
Keywords
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- EP ID EP766621
- DOI 10.16037/j.1007-869x.2025.04.014
- Views 22
- Downloads 0
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