中深层地埋管地热供热系统长期取热性能评价与经济性分析
Evaluation and economic analysis of long-term heat extraction performance of medium and deep buried pipe geothermal heating systems
摘要：
使用开源数值模拟软件OpenGeoSys建立了中深层地埋管换热器三维数值模型，探究了不同钻井深度下的中深层地埋管换热器长期取热性能并进行了系统经济性分析。结果表明：随着中深层套管式地埋管换热器钻井深度的增加，其取热能力明显提升，但与此同时初投资与运行成本也将增加；综合考虑系统初投资及耦合热泵和循环水泵运行成本，在给定参数条件下，钻井深度为2 600 m的中深层地埋管地热供热系统具有最低的平均能源成本，系统投资回收期为10 a左右。
Abstract：
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.
Keywords:medium and deep buried pipe heat exchanger; geothermal heating system; heat extraction performance; numerical simulation; economic analysis; payback period