Numerical and analytical analysis of groundwater influence on the pile ground heat exchanger with cast-in spiral coils

Deqi Wang, Lin Lu, Wenke Zhang, Ping Cui

Research output: Journal article publicationConference articleAcademic researchpeer-review

4 Citations (Scopus)

Abstract

With widespread application of ground-coupled heat pump (GCHP) system, heat transfer process of pile ground heat exchanger (PGHE) has attracted much attention. Previous researches, studying the impact of groundwater flow, mainly focus on the PGHE with cast-in U-T ubes. However, compared with the PGHE with U-T ubes, PGHE with castin spiral coils has better heat transfer performance and is more suitable for a modern city with high building density. Therefore, in this paper, a 3-D simulation model and a simplified analytical model are established to investigate the influence of groundwater flow on the thermal performance of PGHE with cast-in spiral coils. A comparison between these two models is carried out. Both numerical and analytical results show that the groundwater flow has an enhancing effect on the heat transfer performance of the PGHE with spiral coils and can accelerate the heat transfer process into stability. When the seepage velocity is 1e-5 m/s, the average enhancing rate is 22.98%.
Original languageEnglish
Pages (from-to)1784-1788
Number of pages5
JournalEnergy Procedia
Volume61
DOIs
Publication statusPublished - 1 Jan 2014
Event6th International Conference on Applied Energy, ICAE 2014 - National Taiwan University of Science and Technology, Taipei, Taiwan
Duration: 30 May 20142 Jun 2014

Keywords

  • Energy pile
  • Ground-coupled heat pump
  • Groundwater flow

ASJC Scopus subject areas

  • Energy(all)

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