6William S F. Ground-source heat pump design and operatio-experience within an Asian country[G]// ASHRAE Trans, 1998,104(2) : 771- 775
7Michel A B. Uncertainty in the design length calculation or vertical ground heat exchangers[G]// ASHRAE Trans, 2002, 108(1):939-943
8Michel A B. Ground-coupled heat pump system simulation[G]//ASHRAE Trans, 2001, 107 (1): 605-616
9Diao Nairen, Cui Ping, Fang Zhaohong. The thermal resistance in a borehole of geothermal heat exchangers [C]//Proc 12th International Heat Transfer Conference, 2002
10Witte H J L. Geothermal response tests with heat extraction and heat injection: example of application in research and design of geothermal ground heat exchangers[R], 2001