Field measurement and analysis of subway tunnel thermal environment in severe cold region

Yang, Bowen; Sun, Yuena; Yao, Yang; Ni, Long

doi:10.1016/j.buildenv.2023.110629

Cited by 3 publications

(1 citation statement)

References 32 publications

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“…Many scholars have conducted research on the thermal environment of subway tunnels. Yang et al [4] conducted on-site measurements and analysis of subway tunnels in China's severe cold regions and concluded that climatic conditions, burial depth, operating phase of the tunnel, passenger flow, and driving interval have a certain influence on the thermal environment of subway tunnels. Song and Chen [5] analyzed the temporal variations of soil temperature fields and tunnel wall temperatures.…”

Section: Introductionmentioning

confidence: 99%

Cooling performance study of a new cooling system in subway tunnel based on field measurement and CFD simulation

Wang,

Zhang,

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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Some cities’ subways were constructed early and have been in operation for a long time. A large amount of heat accumulates in the rocks around the subway tunnels, causing the phenomenon of heat accumulation. This situation leads to the inadequate cooling capability of train air-conditioning systems, which, may even cease to function under extreme conditions. Currently, few solutions are available to address this issue. Therefore, this study proposes a new cooling system in subway tunnel. Considering the dusty environment inside the tunnel, the terminal equipment mainly consists of natural convection copper tube finless heat exchangers and a self-flushing device without fans, which cool using piston wind. By comparing field measurements of two tunnels with and without the cooling system in similar locations, the results show that the air temperature in the tunnels is reduced after the cooling system is installed. The results indicate that the average temperature in the tunnels decreases from 30.93 °C to 19.80 °C, marking a reduction of 11.13 °C after the cooling system runs for 24 hours. The temperature change in the tunnel is a long-term process, and actual measurements require significant time consumption. In this study, the long-term effect is predicted using CFD simulation in tunnels. The accuracy and credibility of the CFD simulation have been confirmed through its reasonable agreement with experimental data, with the final temperature after 24 hours achieving a relative error of less than 0.26%. Through the simulation, the temperature at a depth of 10 cm inside the tunnel wall after 24 hours is determined to be 27.56 °C, indicating a reduction of 3.44 °C compared to the initial temperature of 31 °C. This study can provide a reference for other subway tunnel cooling systems and serves as a basis for CFD simulations to verify cooling effects.

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Section: Introductionmentioning

confidence: 99%

Cooling performance study of a new cooling system in subway tunnel based on field measurement and CFD simulation

Wang,

Zhang,

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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Numerical analysis of the subway tunnel thermal environment to predict the train-mounted condenser inlet temperature in the cold climate zone of China

Fan,

Zhang,

Liu

et al. 2024

Energy and Buildings

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Changing Rules in Subway Tunnel Thermal Environment and Comprehensive Utilization of Waste Heat

Tong,

Zhang,

et al. 2024

Buildings

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The deteriorating thermal environment of tunnels and the increase in energy consumption of environmental control systems has become highlights in the subway field. In existing research related to analysis of subway tunnel thermal environments and thermal accumulation; there is no predictive law that accounts for thermal accumulation or the long-term change in subway tunnel thermal environments. In this study, a combination of simulations and experiments is used. First, the long-term evolution of tunnel thermal environments with and without thermal interference are predicted and analyzed. Then, the changes in the tunnel thermal environment after the use of capillary heat exchangers are explored. The research results indicate that the model of the system has high accuracy and reliability. When there is a capillary heat exchanger installed in the subway tunnel, the anti-seasonal heat storage characteristics of the system result in the tunnel temperature increasing significantly in summer and decreasing significantly in winter, with a small decrease in the average annual temperature. This study provides a theoretical reference for environment-based subway tunnel construction and the comprehensive utilization of tunnel waste heat.

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Field measurement and analysis of subway tunnel thermal environment in severe cold region

Cited by 3 publications

References 32 publications

Cooling performance study of a new cooling system in subway tunnel based on field measurement and CFD simulation

Cooling performance study of a new cooling system in subway tunnel based on field measurement and CFD simulation

Numerical analysis of the subway tunnel thermal environment to predict the train-mounted condenser inlet temperature in the cold climate zone of China

Changing Rules in Subway Tunnel Thermal Environment and Comprehensive Utilization of Waste Heat

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