SET Proceedings 2978-4387 Caravel Press 10.65582/set.2005.107 2005.107 Simulation Study on Underground Heat Exchanger and the Underground Temperature Field LiXinguo ChenZhihao ChenYan ZhaoJun Department of Thermal Engineering, School of Mechanical Engineering, Tianjin University, Tianjin 300072, P R China 23092005 4 1 978-7-112-07718-2 485 489 23 September 2005 © 2005 Copyright WSSET 2005

Based on inner heat source model of U-vertical ground coupled heat exchanger (UGCHE), the numerical simulation study on the performance of UGCHE and the underground temperature field was carried out by using computer code of AUTOUGH2 in this paper. First, the effects of soil properties on a single heat exchanger was analyzed, then, simulation on a group of heat exchangers under two operation modes was carried out: one was single season operation mode, which only extracted heat from ground in a heating season or emitted heat to ground in a cooling season in one year. The other was double season operation mode, which extracted heat from ground in heating season and emitted heat to ground in cooling season in the year.

 Inner heat source U-vertical ground coupled heat exchanger (UGCHE) Underground temperature field 23 to 25 September 2005 4th International Conference on Sustainable Energy Technologies SET2005 4 Jinan, China Li Xinguo, Zhao Jun, Zhou Qian, Inner Heat Source Model with Heat and Moisture Transfer in Soil around the Underground Heat Exchanger, Applied Thermal Engineering, 2005, 25(10): 1565-1577. Karsten Pruess, Curt Oldenburg, and George Moridis, TOUGH2 user’s guide, Earth science division, Lawrence Berkeley National Laboratory, University of California, 1999,11. Karsten Pruess, TOUGH2-A general purpose numerical simulator for multiphase fluid and heat flow, Earth Science Division, Lawrence Berkeley Laboratory, University of California, Berkeley, CA 94720, May 1991. The soil test report on Meijiang District, Tianjin, by Tianjin Geologic Prospecting Institute, 2001