Thermal Performance of an Energy Pile Group with a Deeply Penetrating U-Shaped Heat Exchanger
Open Access
- 6 November 2020
- Vol. 13 (21), 5822
- https://doi.org/10.3390/en13215822
Abstract
This study presents a novel heat exchanger configuration, called a deeply penetrating U-shaped configuration, for energy piles. The outlet water temperature, temperature variation along the tube, and heat transfer rate are simulated and computed using Comsol Multiphysics software. The simulations are for the cooling mode. The proposed configuration is compared with traditional U-shaped and W-shaped configurations to prove its superiority. The thermal performance of the pile group is compared with that of a single pile to investigate the effects of the pile group on the heat transfer. A parametric analysis is performed to investigate the effects of several important parameters (i.e., pile spacing, pile diameter, soil type, and thermal parameters) on the heat transfer performance of an energy pile group with the proposed deeply penetrating U-shaped configuration. The results indicate that the corner pile indicates a nonnegligible heat transfer rate 6.8% and 9.9% higher than the central pile in quincuncial and squared arrangements. Purely from the standpoint of thermal performance, the pile spacing is recommended to be more than 6.8 times the pile diameter to reduce the influence of the pile group on the heat transfer capacity.Keywords
This publication has 27 references indexed in Scilit:
- Energy and exergy analysis of a combined ground source heat pump systemApplied Thermal Engineering, 2014
- Transient heat transfer in a U-tube borehole heat exchangerApplied Thermal Engineering, 2014
- A new constant heat flux model for vertical U-tube ground heat exchangersEnergy and Buildings, 2012
- Geothermal heat pump systems: Status review and comparison with other heating optionsApplied Energy, 2012
- A two-region simulation model of vertical U-tube ground heat exchanger and its experimental verificationApplied Energy, 2009
- Energy from earth-coupled structures, foundations, tunnels and sewersGéotechnique, 2009
- Evaluation of ground-source heat pump combined latent heat storage system performance in greenhouse heatingEnergy and Buildings, 2009
- Analysis of ground source heat pumps with horizontal ground heat exchangers for northern JapanRenewable Energy, 2009
- Field performance of an energy pile system for space heatingEnergy and Buildings, 2006
- Energy foundations and other thermo-active ground structuresGéotechnique, 2006