竖直地埋管换热器在地下工程中的应用研究

Application of vertical ground heat exchanger to underground works

竖直地埋管换热器替代冷却塔用于地下工程中,有利于工程防护能力和能源效率的提高。探讨了地埋管换热器在地下工程中的应用形式,包括与冷热源和末端的联合使用;基于地下工程的负荷特点和时间特性及山区岩土体的特性,探讨了地埋管换热器的适用性,结果表明地下工程的热负荷特性有利于地埋管换热器周围温度场的恢复,岩土体较大的导热系数和渗流的存在有利于换热效率的提高;分析了地埋管换热器使用可能导致的热红外暴露问题,提出采用表面覆土的方法来解决这一问题,建议覆土厚度为2m。

Replacing cooling tower with the vertical ground heat exchanger （VGHE） is helpful for improving the protection capacity and energy efficiency in underground works. Discusses application forms of VGHE, including those combined with cold and heat source devices and combined with end units. Based on the load and time characteristics of underground works and the geotechnical characteristics of mountain area, explores the practicability of the VGHE. The results show that the thermal load characteristics are helpful for temperature field restoration around VGHE and that the higher heat transfer coefficient Of rock and seepage in soil can improve the heat exchange efficiency. Analyses the problem of thermal infrared exposure caused by VGEH, puts forward the eliminating measure of soil covering, and the proposed thickness of soil layer should not be less than 2m.