20 September 2011

REGRESSION ANALYSIS ON INFLUENCE OF VARIOUS FACTORS ON HEAT TRANSFER OF VERTICAL GROUND HEAT EXCHANGER


The heat transfer performance of Ground Heat Exchanger (GHE) is a key point for Ground Source Heat Pump system. Based on a coupled soil heat conduction and groundwater heat advection model for GHE, a series of simulations are implemented.
Through these simulation results, we can see the influence of different factors such as soil thermal conductivity, groundwater flowrate, borehole parameters, operation schedule etc. on the heat transfer quantity per meter borehole and outlet water temperature from GHE. Then
after that, through the Statistical Program for Social Sciences (SPSS) software, the linear and nonlinear regressions are used to arrive at the relationship between heat transfer
quantity per meter borehole, outlet water temperature and various factors. For example, there are linear relationships between heat transfer quantity per meter borehole and soil
thermal conduction, heat capacity; and nonlinear relationship between heat transfer quantity per meter borehole and soil porosity, groundwater flowrate. Thus it is easy and convenient for the researcher and designer to see the effect of different parameters choice, so as to save a lot of time in the initial stage of design.