中深层地热能的利用主要通过深埋管闭式换热系统实现,系统的换热效率受埋管深度、水泵和热泵能耗的综合影响。以西安某套管式深埋管换热工程为基础,建立深度为2039、2539、3039和3539 m的埋管换热三维全尺寸数值模型,模拟计算121 d换热时长内的埋管取热以及水泵和热泵的能耗情况,进而探究深埋管的综合换热性能。研究结果表明,考虑泵耗时的埋管综合换热功率随深度增加呈近似线性增加趋势,且与埋管净换热功率的最大差异不超过1.5%。
Abstract
The deep-buried closed-loop geothermal heat transfer system is a primary form of utilizing geothermal energy from the middle and deep layers of the Earth. The heat transfer efficiency of the system is comprehensively influenced by the depth of buried pipes, as well as the energy consumption of water pumps and heat pumps. This study, based on a sleeve-type deep-buried pipe heat transfer project in Xi’an, established three-dimensional full-scale numerical models for pipes buried at depths of 2039, 2539, 3039, and 3539 m. The models simulated heat extraction from the buried pipes and the energy consumption of water pumps and heat pumps over 121 days. The investigation aims to explore the comprehensive heat transfer performance of deep-buried pipes. The results indicate that considering pump consumption, the comprehensive heat transfer intensity of buried pipes shows an approximate linear increasing trend with depth, and the maximum difference with the net heat transfer power of buried pipes does not exceed 1.5%.
关键词
地热能 /
换热器 /
传热 /
钻孔 /
数值方法 /
深埋管换热 /
能耗
Key words
geothermal energy /
heat exchangers /
heat transfer /
boreholes /
numerical methods /
deep-buried pipe heat transfer /
energy consumption
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基金
国家自然科学基金（52406217）; 中国博士后科学基金面上项目（2024M762764）; 陕西省“三秦博创”人才支持项目（2024SQBC011）; 陕西省自然科学基础研究计划项目（2024JC-YBQN-0566）
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