地上换热对岩土热响应测试的影响分析

Heat Transfer Analysis for Ground-Coupled Heat Exchanger in a Thermal Response Test

建立了岩土热响应测试的三维数值分析模型,分析了不同情况下地上换热对岩土热响应测试结果的影响。结果表明;在相同条件下,埋管深度越小,地上换热引起岩土热响应测试结果的误差就越大;测试环境空气温度的波动会导致岩土热响应测试结果的波动;在实际工程应用中,可通过抑制载流体与地上环境之间一切形式的换热,来减少岩土热响应测试结果的误差。

Based on a 3D numerical model of thermal response test(TRT) for ground heat exchanger,the influence of overground heat transfer on TRT has been systematically studied under different conditions.The simulation results show that the shorter the buried pipe,the larger the obtained error under the same conditions,and the fluctuant air temperature will lead to the fluctuation of TRT results.In order to decrease the error of TRT,the overground heat transfer between carrier fluid and ambient should be carefully restrained.