地源热泵岩土体导热系数确定方法的实例分析
Case study on determination of rock-soil thermal conductivity for ground-source heat pump systems
摘要：
以3个地源热泵工程为例，对用查表法确定的岩土体平均导热系数和现场岩土热响应试验确定的导热系数进行了比较，结果显示，两者相对误差小于10%。建议对于小型竖直地埋管地源热泵工程，利用查表法获得埋管深度范围内岩土体的平均导热系数；对于大、中型地埋管地源热泵项目，采用取芯钻探方法对地埋管岩土热响应试验孔进行施工，用查表法对现场热响应试验结果进行验证。
Abstract：
Taking three ground-source heat pump projects for example, compares average thermal conductivity of rock-soil body determined by look-up table method with that determined by thermal response test. The results show that the relative difference of thermal conductivities determined by two ways is less than 10%. Suggests that for small vertical buried pipe projects, average thermal conductivity of rock-soil body in the pipe depth range can be determined by look-up table method, while for large or medium sized projects, the boreholes for thermal response test should be drilled with the core drilling method, and then thermal conductivities measured by thermal response test are verified by look-up table method.
Keywords:ground-source heat pump, rock-soil thermal conductivity, look-up table method, thermal response test, core drilling