中深層地埋管地熱供熱系統長期取熱性能評價與經濟性分析
Evaluation and economic analysis of long-term heat extraction performance of medium and deep buried pipe geothermal heating systems
摘要：
使用開源數值模擬軟件OpenGeoSys建立了中深層地埋管換熱器三維數值模型，探究了不同鉆井深度下的中深層地埋管換熱器長期取熱性能并進行了系統經濟性分析。結果表明：隨著中深層套管式地埋管換熱器鉆井深度的增加，其取熱能力明顯提升，但與此同時初投資與運行成本也將增加；綜合考慮系統初投資及耦合熱泵和循環水泵運行成本，在給定參數條件下，鉆井深度為2 600 m的中深層地埋管地熱供熱系統具有最低的平均能源成本，系統投資回收期為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:mediumanddeepburiedpipeheatexchanger;geothermalheatingsystem;heatextractionperformance;numericalsimulation;economicanalysis;paybackperiod