Single factor sensitivity study of heat exchange performance of vertical single U-tube ground heat exchangers

Based on the conduction and groundwater advection coupled model for the vertical single U-tube ground heat exchanger, analyses the influences on heat exchange performance of such factors as thermal conductivity coefficient, volumetric heat capacity and porosity of rock and soil, original ground temperature, groundwater seepage velocity, pipe buried depth, flowrate in pipe, inlet water temperature of buried pipe and operation modes. Conducts a single factor regression analysis, and obtains the relational fitting expression of heat exchange quantity per unit borehole depth and outlet water temperature of buried pipe concerning various parameters.