Evaluation and economic analysis of long-term heat extraction performance of medium and deep buried pipe geothermal heating systems
Yang Xiong1,2, Jiang Jinghua1,2, Wang Fenghao1,2, Cai Wanlong1,2, Liu Jun2,3, Zhang Yuping2,3
n this paper, the open-source simulation software OpenGeoSys is used to establish a three-dimensional numerical model of medium and deep buried pipe heat exchanger (DBHE). Then the long-term heat extraction performance and economic analysis of the DBHE with different drilling depths are investigated. The results show that with the increase of the drilling depth of medium and deep casing buried pipe heat exchanger, its heat extraction performance is significantly improved, along with higher initial investment and operating costs. Considering the system initial investment and electricity consumption of heat pump and circulation pump, the medium and deep buried pipe geothermal heating system with 2 600 m drilling depth has the lowest average energy cost under the given condition, and the payback period of this system is around 10 years.