Numerical Study on Heat Transfer Performance of Geothermal Pile-Foundation Heat Exchanger in GSHP System
Published in The Fourth NZAAR International Event Series on Natural and Built Environment, Cities, Sustainability and Advanced Engineering, Kuala Lumpur, Malaysia, 27 January 2018, pages 102 to 111. New Zealand Academy of Applied Research. ISSN 2463-5979 (online), 2463-5960 (print). Indexed in the Web of Science Core Collection, Conference Proceedings Citation Index (Clarivate).
Abstract
Targeting the heat transfer performance of geothermal pile-foundation heat exchanger in ground source heat pump system (GSHP), the physical model of pile-foundation heat exchanger with treble U-shaped form of pipes in surrounding soil were established. CFD software was used to simulate heat transfer processes based on the Finite Element Method for Nanjing area. In cooling mode, heat transfer performance inside and outside of concrete pile was analyzed. Heat transfer flux per meter of the pile-foundation heat exchanger (Q, W·m-1) gradually decreases and eventually stabilizes at around 60 W·m-1 with system running for one month. The higher thermal conductivity of pile-foundation heat exchanger contributes to the higher heat transfer efficiency than soil. Simulation results are approximate to the actual results and can be used as theoretical basis for the design and application of pile-foundation heat exchanger in GSHP system.
Keywords: Ground source heat pump; Pile-foundation heat exchanger; Heat transfer performance; Temperature distribution; Numerical simulation
Rights
Copyright © New Zealand Academy of Applied Research Ltd 2018. All rights reserved. Reproduced in the GDI Academy archive from the original proceedings without change to the authors’ text.