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建立了单U型地埋管换热器三维瞬态数值分析模型,对抑制地埋管换热器“热短路”的各种措施进行了数值模拟。在不同载流体流速和回填料导热系数条件下,分别对隔热板式、保温套式地埋管换热器和未采取任何“热短路”抑制措施的普通地埋管换热器整体传热性能进行了研究,获得了不同“热短路”抑制措施对埋管换热器整体传热性能的影响规律;通过对影响埋管换热器整体传热性能“热短路”抑制措施的对比分析,并结合地埋管换热器实际工程运行环境,提出在工程实践中不必针对埋管换热器的“热短路”现象采取任何额外的抑制措施的建议。
A three-dimensional transient numerical analysis model of a single U-type ground heat exchanger was established, and various measures to suppress the ground heat exchanger “hot short circuit ” were numerically simulated. Under the conditions of different carrier flow rate and thermal conductivity of backfill, respectively, the heat exchanger, heat-insulated sets of buried heat exchangers and heat exchanger without any “short-circuit” The influence of different “hot short circuit” suppression measures on the overall heat transfer performance of the buried tube heat exchanger was obtained. By controlling the overall heat transfer performance of the tube heat exchanger “thermal short circuit” Based on the comparison and analysis of the actual operation of underground heat exchangers and heat exchangers, this paper puts forward the suggestion that any additional suppression measures should not be taken for the “hot short circuit” of buried heat exchangers in engineering practice.