5Bose J E,Parker J D,McQuiston F C. Design/data manual for closed-loop ground-coupled heat pump systems[M].Atlanta:ASHRAE,1985.
6Kavaragh S P.Ground-source heat pumps[J].ASHARE Journal,1998,40(10).
7Gu Y,O′Neal D L.Development of an equivalent diameter expression for vertical U-tubes used in ground-coupled heat pumps[J].ASHRAE Transactions,1998,104(2):347-355.
8Diao N R,Cui P,Fang Z H.The thermal resistance in a borehole of geothermal heat exchangers[C].Proc.12th International Heat Transfer Conference,2002.