Experimental analysis on operation process of horizontal ground heat exchanger under cooling provision
Zeng Zhaotian , Tang Shuanghui , Zhao Yanlin , Xu Yunshan , Lu Haibo
DOI:10.11835/j.issn.1674-4764.2016.04.008
Received March 02, 2016,Revised , Accepted , Available online July 04, 2017
Volume ,2016,Pages 46-52
- Abstract
Experiment on ground source heat pump (GSHP) was conducted in summer to monitor the factors such as the heat exchange performance parameters of horizontal ground heat exchangers (GHEs), the climatic conditions around the testing site and variations of soil temperatures and moistures during the operation process. The heat exchange performance of horizontal GHEs as well as the variation laws of temperature and moisture fields around their surrounding soils was explored. The results showed that the intermittent operation model of GSHP was beneficial to the recovery of soil temperature field. The heat exchange capacity of horizontal GHEs from their surrounding soils improved significantly with the increase of downtimes. The climatic conditions had an obvious influence on the distributions of soil temperature field around the horizontal GHE. The influence of climatic conditions on soil temperature was becoming obvious with the decrease in burial depth. The changing amplitude of soil temperature field decreased with the increase in distance from the horizontal GHE was found,resulting in a heat influence range of the GHE with a radius of about 1.0 m. Finally, the impact of heat exchange of horizontal GHE to soil moisture field was in-apparent. However, the surface water infiltrating caused by rainfall was an obvious influence factor on the variation of soil moisture field.