Phase Change Cold Storage and Cooling Technology for Tunnels
(1. China Construction Eighth Engineering Division Corp., Ltd., Shanghai 200112; 2. Institute of Geotechnical Engineering of Southeast University, Nanjing 211189)
Abstract：
The phase change cold storage and cooling technology for tunnels is a green, environment-friendly, ener? gy-efficient and sustainable new technology that can overcome the limitations of the conventional cooling methods for tunnels with high rock temperature, thus contributing to the accomplishment of dual carbon goals. Through a literature review, this paper systematically analyzes the current status of the research into energy tunnels, phase change cold storage material, phase change energy storage structure and the phase change plate based on tunnel lining heat exchanger energy storage and also the current situation and progress of the research into application of phase change materials in tunnels and underground works, so as to promote the application and popularization of the new phase change cold storage and cooling technology for tunnels. The study indicates: (1) Energy tunnel is an efficient way of using shallow geothermal energy, and tunnel lining heat exchanger can extract sufficient shallow geothermal energy for the purpose of energy storage in phase change energy storage structure; (2) Solid-liquid phase change cold storage materials have been widely applied. It is recommended to use the composite solid-liquid phase change cold storage materials with high thermal conductivity, high latent heat, suitable phase change temperature and excellent stability in actual projects; (3) The approaches such as changing pipe type, adding fin structure and designing the phase change energy storage structures of various geometric forms will optimize and improve the heat transfer performance of phase change energy storage structure; (4) Storing cold in phase change plate by using tunnel lining heat exchanger is feasible, and increasing the thermal conductivity of phase change material, increasing difference between the phase change temperature and surrounding rock temperature and increasing the length of tunnel lining heat exchanger will all increase the energy efficiency of phase change plate; (5) Research into application of phase change materials in tunnel and underground engineering (e. g. refuge chamber) indicates that it is feasible to use phase change materials for tunnel cooling.
WU Yuanhao1 ZHANG Guozhu2 CAO Ziming2 LI Chenglin2 LIU Xinye2 LIU Yifei2
.Phase Change Cold Storage and Cooling Technology for Tunnels[J] MODERN TUNNELLING TECHNOLOGY, 2023,V60(6): 80-90
2023, Vol. 60 