喀斯特地貌下复合式地源热泵系统经济性分析

Economic analysis of hybrid ground-source heat pump system under the karst landform

对喀斯特地貌下地源热泵室外地埋管系统、地源热泵机房进行设计与选型,并对冬夏季土壤最大吸热量与释热量、地埋管换热井数和辅助散热冷却塔进行设计计算;分析喀斯特地貌对室外地埋管传热与后期施工的影响,强调喀斯特地貌下地源热泵系统地埋管费用极大地影响其经济性与回收期。通过对工程实例进行计算分析,复合式地源热泵空调系统的年运行费用比空气源热泵+冷水机组系统节省215.8万元,节能率高达37.7%,动态追加投资回收期为5.8年。

The paper presents the design and selection of the ground heat exchanger system and the ground source heat pump room under the karst landform,and calculates the maximum heat absorption and release of soil in winter and summer,the number of heat exchanger,and the design of the auxiliary cooling tower under the karst landform.The impact of the karst landform on heat transferring of the ground heat exchanger system and later construction is analyzed,and the cost of the ground heat exchanger system under the karst landform is emphasized to greatly affect its economic viability and payback period.Through the calculation and analysis on the engineering example,the results show that the hybrid ground-source heat pump air conditioning system saves 2.158 million yuan in annual operating costs compared to the air source heat pump+chiller system,with an energy saving rate of up to 37.7%,and a dynamic incremental investment payback period of 5.8 years.