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Experimental Investigation on Performances of Capillary Mat Heat Exchangers in a Thermal Energy Tunnel
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Yongyan Wang1, Guobing Zhou1, Jun Liu2, Fuqiang Wang3, Guogang Qiao4, Hui Huang2
Journal of Refrigeration | 2025, 46(2) : 129 - 136
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Journal of Refrigeration | 2025, 46(2): 129-136
Experimental Investigation on Performances of Capillary Mat Heat Exchangers in a Thermal Energy Tunnel
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Yongyan Wang1, Guobing Zhou1, Jun Liu2, Fuqiang Wang3, Guogang Qiao4, Hui Huang2
Affiliations
  • 1.School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing, 102208, China
  • 2.School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China
  • 3.The Third Engineering Department of Beijing Municipal Construction Group Co., Ltd., Beijing, 100176, China
  • 4.Beijing Municipal Construction Group Corporation, Beijing, 100480, China
Published: 2025-04-16 doi: 10.12465/j.issn.0253-4339.2025.02.129
Outline
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Capillary mat heat exchangers are increasingly used in transportation energy tunnels owing to their large heat-transfer area and uniform temperature. Thermal energy tunnels, a new type of energy tunnel, differ from transportation energy tunnels because of the heat source inside such tunnels. To examine the feasibility of applying capillary mat heat exchangers in thermal energy tunnels under endothermic conditions, heat transfer performance was experimentally investigated using a 1∶1 intermittent operating mode. The results showed that the higher the initial air temperature (T0) in the tunnel, the greater the heat flux. With the inlet temperature of circulating water (tin) fixed at 5 ℃, as the temperature difference between T0 and tin increases by 10 ℃, the heat flux increases by 45.9%. The heat flux also increases with the increase of circulating water velocity (u); whereas u increases up to 0.1 m/s, the heat transfer rate saturates and approaches 187.22 W/m2. The lower the tin is, the greater the heat flux. When the T0 is 50 ℃ and the u is 0.075 m/s, for every 1 ℃ increase in the tin, the heat transfer rate decreases by 2.04%.

Yongyan Wang, Guobing Zhou, Jun Liu, Fuqiang Wang, Guogang Qiao, Hui Huang. Experimental Investigation on Performances of Capillary Mat Heat Exchangers in a Thermal Energy Tunnel[J]. Journal of Refrigeration, 2025 , 46 (2) : 129 -136 . DOI: 10.12465/j.issn.0253-4339.2025.02.129
Funding
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  • Beijing Municipal Natural Science Foundation-Haidian District Original Innovation Joint Fund(L212068)
  • Beijing Municipal Natural Science Foundation(3192034)
Appendix
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Year 2025 volume 46 Issue 2
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83
39
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Article Info
doi: 10.12465/j.issn.0253-4339.2025.02.129
  • Receive Date：2024-01-11
  • Online Date：2026-03-13
  • Published：2025-04-16
Article Data
Affiliations
History
  • Received：2024-01-11
  • Revised：2024-01-30
  • Accepted：2024-04-03
Funding
Beijing Municipal Natural Science Foundation-Haidian District Original Innovation Joint Fund(L212068)
Beijing Municipal Natural Science Foundation(3192034)
Affiliations
    1.School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing, 102208, China
    2.School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China
    3.The Third Engineering Department of Beijing Municipal Construction Group Co., Ltd., Beijing, 100176, China
    4.Beijing Municipal Construction Group Corporation, Beijing, 100480, China

Corresponding:

Zhou Guobing, male, professor, School of Energy, Power and Mechanical Engineering, North China Electric Power University, 86-13717509738, E-mail: . Research fields: phase change heat storage and solar buildings.
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表12种不同金属材料的力学参数
科
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Number of
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Number of
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Percentage of
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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