Development of in-situ testing equipment of rock and soil thermophysical properties

A mobile in-situ testing equipment used to detect geotechnical thermophysical properties was developed. The equipment is composed of a heat pump, frequency pumps, an electric tee joint regulator valve, some sensors, an electric control system, data acquisition and control system, which can do tests under the condition of extracting and storing subsurface heat. Applying the line source and the cylinder source heat transfer model, and combining the parameters estimation, the average thermophysieal property parameters of rock and soil will be calculated, which provides the basis for designing the ground source heat pump systems.

BTR-4000型地层热物性原位测试仪及其应用

地层热物性原位测试仪主要包括液路循环系统、数据采集和控制系统及电气控制系统等。利用测试仪对某热交换井进行现场测试,得到换热器进、出口循环水温度随时间逐渐趋于稳定,及换热器与周围土壤的换热量随时间基本保持恒定的相关曲线。采用线源和柱源传热模型,结合参数估计法,计算出平均热物性参数分别为:土壤热传导系数λ=2.428 W/(m.K),钻孔热阻R=0.102(m2.K)/W,及λ=2.164 W/(m.K),R=0.086(m2.K)/W。通过保证测试时间和准确的土壤比热容等参数,可得到准确的热物性参数,计算结果为地源热泵系统的准确设计提供了依据。

便携式地层热物性原位测试仪及其应用

便携式地层热物理性质原位测试设备可以为地源热泵系统的设计提供准确的地层热物性参数,确保系统设计的准确性和经济性。概述了便携式地层热物性原位测试仪的原理、传热模型、结构组成及特点,并结合其应用实例介绍了便携式地层热物性原位测试的具体操作流程。