Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Analysis of the Combined Effect of Major Influencing Parameters for Designing High Performance Single (sBHE) and Double (dBHE) U-Tube Borehole Heat Exchangers

Version 1 : Received: 28 February 2024 / Approved: 7 March 2024 / Online: 7 March 2024 (12:52:52 CET)

A peer-reviewed article of this Preprint also exists.

Kerme, E.D.; Fung, A.S.; Leong, W.H. Analysis of the Combined Effect of Major Influencing Parameters for Designing High-Performance Single (sBHE) and Double (dBHE) U-Tube Borehole Heat Exchangers. Energies 2024, 17, 2525. Kerme, E.D.; Fung, A.S.; Leong, W.H. Analysis of the Combined Effect of Major Influencing Parameters for Designing High-Performance Single (sBHE) and Double (dBHE) U-Tube Borehole Heat Exchangers. Energies 2024, 17, 2525.

Abstract

In this paper, comprehensive analysis of combined effect of major influencing parameters on heat transfer in the single U-tube BHE (sBHE) and double U-tube BHE (dBHE) with two independent circuits was performed by using validated numerical heat transfer model. Geometrical parameters, such as shank spacing (with maximum, average and minimum values) and borehole diameter (large, medium and small borehole sizes) and borehole depth (shallow, average and deep borehole depths) as well as thermal conductivity of soil and grout which ranges from minimum to high value were considered. The combined impact of these parameters was included under four major cases: 1) combined effect of borehole depth, borehole size and shank spacing; 2) combined effect of borehole depth, and soil and grout thermal conductivity; 3) combined effect of soil and grout thermal conductivity and borehole size; and 4) combined effect of soil thermal conductivity, borehole size and shank spacing. Each of these major cases has nine different design options of both sBHE and dBHE. Series of results of heat transfer per unit borehole depth were generated for all the considered various cases. With the given parameters, the BHE case that provides highest heat transfer among the various cases of sBHE and dBHE were obtained.

Keywords

borehole heat exchanger; heat transfer per unit borehole depth; shank spacing; borehole size; combined impact of parameters; convective heat transfer coefficient

Subject

Engineering, Energy and Fuel Technology

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