Mozafary, Seyedeh Mahya, Fung, Alan S., Leong, Wey H. et Kerme, Esa Dube.
2025.
« Performance comparison of single and double U-tube borehole heat exchangers in ground source heat pump systems ».
In Proceedings of the CSME-CFDSC-CSR 2025 International Congress (Montreal, QC, Canada, May 25-28, 2025)
Coll. « Progress in Canadian Mechanical Engineering », vol. 8.
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Résumé
As global energy demand for heating and cooling continues to rise, largely driven by increasing temperatures and reliance on air conditioning, sustainable alternatives such as ground source heat pump (GSHP) systems are critical to reducing dependence on fossil fuels and mitigating grid instability. This study develops a numerical model to evaluate the thermal performance of single and double U-tube borehole heat exchangers (BHEs), namely sBHE and dBHE, integrated with a heat pump. The model examines the impact of borehole depth, mass flow rate of the circulating fluid, and heating and cooling loads of a building on system efficiency. Three different cases of dBHE consistently outperform the base case of a 75-m sBHE with a total mass flow rate of 0.2 kg/s and a constant building demand of 3.52 kW (1 ton) for heating and cooling. These results are obtained under identical soil, grout, pipe and working fluid thermal properties for all cases, including the base case, as well as identical borehole size, U-tube size and shank spacing.In Case 1, a 75-m dBHE with a 50% reduced mass flow rate (0.1 kg/s in total) improves entrance water temperature (EWT) to the heat pump from -0.13°C to 3.22°C in heating mode and from 30.5°C to 25.7°C in cooling mode, while increasing heating coefficient of performance (COP) by 2.8% and cooling COP by 10.9%. In Case 2, when subjected to higher building loads (4.22 kW (1.2 tons) instead of 3.52 kW), a dBHE can still sustain system efficiency for both heating and cooling modes, while increasing heat extraction by 25.2% and heat rejection by 21.6%. In Case 3, a 60-m dBHE can achieve comparable performance to the 75-m sBHE, with a minor 0.6% increase in heating COP and less than a 2% decrease in cooling COP, suggesting that the depth of a dBHE can be reduced by up to 20% without sacrificing performance. These findings highlight the superior efficiency, adaptability, and cost-saving potential of dBHE for GSHP applications, enabling optimized performance across various design constraints.
| Type de document: | Compte rendu de conférence |
|---|---|
| Éditeurs: | Éditeurs ORCID Hof, Lucas A. NON SPÉCIFIÉ Di Labbio, Giuseppe NON SPÉCIFIÉ Tahan, Antoine NON SPÉCIFIÉ Sanjosé, Marlène NON SPÉCIFIÉ Lalonde, Sébastien NON SPÉCIFIÉ Demarquette, Nicole R. NON SPÉCIFIÉ |
| Date de dépôt: | 18 déc. 2025 15:17 |
| Dernière modification: | 18 déc. 2025 15:17 |
| URI: | https://espace2.etsmtl.ca/id/eprint/32467 |
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