Thermal performance evaluation of vertical U-loop ground heat exchanger using in-situ thermal response test

摘要

An in-situ thermal response test is applied to the thermal performance evaluation of the vertical closed U-loop ground heat exchangers (GHX). A line source method is used to derive the thermal conductivity and borehole thermal resistance from data obtained by the thermal response test. Tests are made for four types of GHXs with different borehole configurations. Results are presented in terms of configuration and operating parameters of GHXs to investigate their effects on the thermal performances.