Three-dimensional temperature field Simulation of Ground heat ezchangers with Groundwater Flow
In order to investigate the impact of groundwater flow on performance of ground heat exchanger in geothermal heat pump systems, a three-dimensional finite line source model with groundwater advection was developed. A formula of the non-steady temperature response in a semi-infinite medium with a line source of finite length has been derived by means of setting a virtual line sink, using moving line source solution and the Green function method. The characteristics of field temperature rise, around a single borehole, were studied by virtue of Mablab program. Simulation results showed that the groundwater flow would cause a distortion of the original symmetrical temperature field and the magnitude of equivalent groundwater flow rate at 10.6 level could effectively alleviate the underground heat imbalance. Also it was found that the temperature was not constant along the borehole, and maximum temperature occurred near the mid level of borehole. The proposed three-dimensional model can be used to investigate the complex problem of various regions with multi-layer soil level and different groundwater flow, which is the basis for the following study on the temperature field around the ground heat exchangers considering multi-layer soil level and groundwater flow.
Geothermal heat pump systems Groundwater flow Ground heat ezchanger Three-dimensional heat transfer model
Hui Long Yuejin Yu Zhouquan Feng
College of Power Engineering,Nanjing Normal University,Nanjing,China Department of Civil and Environmental Engineering,HKUST,Hong Kong,China
国际会议
The 6th International Symposium on Heating,Ventilating and Air Conditioning(第六届国际暖通空调学术会议)
南京
英文
716-723
2009-11-06（万方平台首次上网日期，不代表论文的发表时间）