15.Experimental study on the influence of differentsoil porosity and moisture content on the heat exchange forground source heat pump system
Author: ZHANG Li 1，3 *，JIN Yonglei 1 ，CHEN Ｒenlei 2 ，GUO Changcheng 1 ，WANG Haofeng 1 ，WANG Guangbin 4
Abstract:
An experimental device was designed and constructed based on the principle of similarity to investigate the heat exchangeprocess of buried pipes with soil of different porosity ( 0． 337 to 0． 441) and moisture content ( 5% to 25% ) ． The results show that theaverage thermal conductivity decreases by 7． 78% when the soil porosity increases from 0． 337 to 0． 441，and the average heat exchangevolume decreases by 6． 25% ; The average thermal conductivity of the soil increased by 22． 22% and the average heat exchange in-creased by 22． 97% when the soil moisture content increased from 5% to 25% ． Within the studied ranges of soil porosity ( 0． 337 to0. 441) and water content ( 5% to 25% ) ，larger soil porosity limits heat transfer between subsurface soils，whereas the increase in vol-umetric soil moisture content can enhance the heat exchange between underground soil particle．
Keywords: Vertical bore heat exchanger; Soil porosity; Soil moisture content; Experimental study
Full Text Link: https://link.cnki.net/doi/10.16559/j.cnki.2095-2295.2025.03.015