An iterative numerical method to determine g-functions 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 × 2 borehole field.

A new numerical method to determine isothermal g-functions of borehole heat exchanger fields / Naldi, Claudia*; Zanchini, Enzo. - In: GEOTHERMICS. - ISSN 0375-6505. - STAMPA. - 77:(2019), pp. 278-287. [10.1016/j.geothermics.2018.10.007]

A new numerical method to determine isothermal g-functions of borehole heat exchanger fields

Naldi, Claudia
;
Zanchini, Enzo
2019

Abstract

An iterative numerical method to determine g-functions 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 × 2 borehole field.
2019
A new numerical method to determine isothermal g-functions of borehole heat exchanger fields / Naldi, Claudia*; Zanchini, Enzo. - In: GEOTHERMICS. - ISSN 0375-6505. - STAMPA. - 77:(2019), pp. 278-287. [10.1016/j.geothermics.2018.10.007]
Naldi, Claudia*; Zanchini, Enzo
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/658058
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