Impact of Corrugated Fins on Flow and Heat Transfer Performance in Medium-Deep Coaxial Underground Heat Exchangers DOI Creative Commons
Yan Shi, Chengcheng Liu, Hongxu Chen

et al.

Energies, Journal Year: 2025, Volume and Issue: 18(9), P. 2212 - 2212

Published: April 26, 2025

To enhance the efficient development of geothermal energy, this study investigates heat transfer enhancement mechanisms in medium-depth coaxial underground exchangers (CUHEs) integrated with corrugated fins, using computational fluid dynamics (CFD) simulations. Nine distinct fin geometries were modeled, and streamlines, velocity fields, temperature turbulent kinetic energy analyzed across Reynolds numbers (Re) ranging from 12,000 to 42,000. The results demonstrate that fins significantly promote turbulence mixing, thereby augmenting convective transfer. Compared smooth inner tubes, Nusselt number (Nu) is enhanced by a factor 1.43–2.19, while friction (f) increases 2.94–6.79. performance evaluation criterion (PEC) improves increasing width decreasing spacing. optimal configuration, featuring 15 mm, spacing 60 thickness achieves maximum PEC value 1.34 at Re = 12,000, indicating substantial improvement within acceptable pressure drop limits. This research innovatively explores CUHEs high Re, systematically elucidates influence geometric parameters on flow resistance, employs index optimize structural design. provides significant theoretical support for engineering application utilization.

Language: Английский

Impact of Corrugated Fins on Flow and Heat Transfer Performance in Medium-Deep Coaxial Underground Heat Exchangers DOI Creative Commons
Yan Shi, Chengcheng Liu, Hongxu Chen

et al.

Energies, Journal Year: 2025, Volume and Issue: 18(9), P. 2212 - 2212

Published: April 26, 2025

To enhance the efficient development of geothermal energy, this study investigates heat transfer enhancement mechanisms in medium-depth coaxial underground exchangers (CUHEs) integrated with corrugated fins, using computational fluid dynamics (CFD) simulations. Nine distinct fin geometries were modeled, and streamlines, velocity fields, temperature turbulent kinetic energy analyzed across Reynolds numbers (Re) ranging from 12,000 to 42,000. The results demonstrate that fins significantly promote turbulence mixing, thereby augmenting convective transfer. Compared smooth inner tubes, Nusselt number (Nu) is enhanced by a factor 1.43–2.19, while friction (f) increases 2.94–6.79. performance evaluation criterion (PEC) improves increasing width decreasing spacing. optimal configuration, featuring 15 mm, spacing 60 thickness achieves maximum PEC value 1.34 at Re = 12,000, indicating substantial improvement within acceptable pressure drop limits. This research innovatively explores CUHEs high Re, systematically elucidates influence geometric parameters on flow resistance, employs index optimize structural design. provides significant theoretical support for engineering application utilization.

Language: Английский

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