Key;
Laboratory;
of;
Three;
Gorges;
Reservoir;
Region’s;
Eco-Environment,Ministry;
of;
Education,Chongqing;
University;
Key;
Laboratory;
of;
Three;
Gorges;
Reservoir;
Region’s;
Eco-Environment,Ministry;
of;
Education,Chongqing;
University;
ground-source; heat; pump; heat; transfer; performance; single; U-tube; double; U-tube; techno-economic; analysis;