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暖通空调>期刊目次>2021年>第6期

中深层地热能供暖地埋管换热器传热分析

medium-deep geothermal energy, ground heat exchanger, heat transfer, heat extraction, thermal influence radius, circulating fluid, underground rock and soil

关春敏[1] 赵树旺[2] 张文科[3] 孙炳岩[3] 王建华[3] 孙知晓[3] 方肇洪[4]
[1]山东建筑大学 [2]山东中瑞新能源科技有限公司 [3]山东建筑大学 [4]山东中瑞新能源科技有限公司

摘要:

介绍了中深层地热能套管式换热器的结构和工作原理,建立了换热管内循环流体及钻孔周围岩土介质的能量控制方程。以某地源热泵工程项目为例,分析了钻井深度、循环液流量及大地热流对地埋管换热器名义取热量的影响,以及循环液进出口温度的变化、地埋管换热器的热影响半径、钻孔壁的温度分布,揭示了项目运行时取热量、循环液及地下岩土相关参数的变化。

关键词:中深层地热能,地埋管换热器,传热,取热量,热影响半径,循环液,地下岩土

Abstract:

 Presents the structure and working principle of medium-deep geothermal energy double tube heat exchangers, and establishes the energy control equations for the circulating fluid in the heat exchange tubes and the rock and soil media around the borehole. Taking a ground source heat pump project as an example, analyses the effects of drilling depth, circulating fluid flow and geothermal flow on the nominal heat extraction of ground heat exchangers, as well as the changes of both the inlet and outlet temperatures of the circulating fluid, the thermal influence radius of ground heat exchangers, and the temperature distribution of the borehole wall. Reveals the changes of the heat extraction and the relevant parameters of circulating fluid and underground rock and soil during project operation.

Keywords:Heattransferanalysisofgroundheatexchangersformedium-deepgeothermalenergyheating

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