现场测量深层岩土热物性方法

A METHOD FOR IN SITU DETERMINING THE THERMAL PROPERTIES OF DEEP GROUND

地下岩土的热物性参数是地源热泵地热换热器的设计中所需要的很重要的参数。热物性参数的大小对钻孔的数量及钻孔的深度具有显著的影响，进而影响地源热泵系统的初投资。为了能够在现场测量地下岩土的热物性参数，本文利用一套现场测量设备测量了对地下埋管回路施加的热流与回路中循环水温度随时间的变化，并利用参数估计方法确定地下岩土的热物性参数。

Thermal properties of deep ground are important data for designing geothermal heat exchangers in ground source heat pump (GSHP) systems. The values of the thermal properties have great influence on the number and depth of boreholes; thereby influence the initial cost of GSHP systems. To determine the thermal properties of deep ground soil/rock, the authors have designed an insitu system to measure the heat flux imposed on the ground loop heat exchanger and temperature Variation of the circulating fluid in the loop with time. A parameter estimation algorithm was used to estimate the mean thermal properties of the ground.