Abstract
The continuous increase of the ambient temperature in the subway tunnel not only increases the energy consumption of the air conditioning but also makes of the air conditioning condenser of the train less efficient. In this paper, the thermal environment of a long-term operating subway system tunnel in Shanghai, China is taken as the research object, and the night ventilation cooling strategy in non-air-conditioning season is proposed. CHAMPS-BES software was used to establish a soil model surrounding the subway tunnel to explore the effect of night ventilation. The temperature decay of the interval tunnel was simulated in the hottest month from December to March, with a large temperature difference between day and night, and in May and June, with a close distance to the hottest month. The results show that if the night ventilation is turned on for two months, the most suitable months to choose for cooling tunnel air during the summer are January and February, with reductions of 0.46, 0.48, and 0.39 °C, respectively. While if the night ventilation is turned on for three months, the most suitable months are January, February, and March, with temperature reductions of 0.60, 0.63, and 0.54 °C, respectively.
Published Version
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