期刊
GEOTHERMICS
卷 77, 期 -, 页码 278-287出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.geothermics.2018.10.007
关键词
Ground-coupled heat pumps; Borehole heat exchangers; Thermal response factor; G-function; Isothermal boundary condition; Numerical method
An iterative numerical method to determine g-fwictions of borehole fields with the boundary condition of uniform temperature and time-constant surface-averaged heat flux is proposed. The method employs boundary conditions of uniform time-dependent temperature that converge to time-constant surface-averaged heat flux. Two simulations are sufficient for technical purposes, while additional simulations yield very precise g-functions with the desired boundary condition. The method is applied to analyze the overestimation of the g-function yielded by the condition of uniform and constant heat flux and the effects of the buried depth and of the spacing between boreholes on the g-function, for a 3 x 2 borehole field.
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