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建立了地源热泵岩土热物性现场测试系统的三维数值模型,基于所建数值模型分析了测试时间、舍弃初始小时数、钻孔半径、岩土体初始温度、加热器输入功率等因素对岩土热响应测试结果的影响。研究结果表明:对于柱热源模型,随着钻孔尺寸的增大,辨识得到的热导率越小;采用参数估计法作为辨识方法时,岩土初始温度的测试精度对辨识结果有较大影响。测试得到的热导率有6%~18%的偏差。
A three-dimensional numerical model of on-site geothermal field test system for geothermal heat pump was established. Based on the built numerical model, the influence of testing time, initial hours of abandonment, radius of borehole, initial temperature of geomaterials and heater input power on rock Effect of soil thermal response test results. The results show that for the column heat source model, the thermal conductivity is smaller with the increase of the borehole size. When the parameter estimation method is used as the identification method, the testing accuracy of the geotechnical initial temperature has a great influence on the identification results . The thermal conductivity of the test is 6% ~ 18% deviation.