A modified three-dimensional numerical model for predicting the short-time-step performance of borehole ground heat exchangers

C.K. Lee

Renewable Energy, 2016, vol. 87, issue P1, 618-627

Abstract: A modified three-dimensional numerical model for the borehole ground heat exchangers was proposed which took into account the effect of grout thermal capacitance and fluid circulation period inside the U-tube in a short-time-step analysis. The present model was validated by experimental data from others. It was found that the fluid temperature along the U-tube changed abruptly at the interface between the entering and the existing fluid inside the borehole. Before the entering fluid travelled to the bottom of the U-tube, the borehole was only partly-loaded. The difference in the simulated fluid leaving temperatures between the long- and short-time-step approaches could be up to 3 °C when a periodic intermittent load, common during the low-load season, was applied. This implied that a short-time-step model should be used in a long-term dynamic system simulation.

Keywords: Ground-source heat pump; Ground heat exchanger; Borehole; U-tube; Short-time-step (search for similar items in EconPapers)
Date: 2016
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Citations: View citations in EconPapers (5)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:87:y:2016:i:p1:p:618-627

DOI: 10.1016/j.renene.2015.10.052

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