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An investigation of the heat pump performance and ground temperature of a piled foundation heat exchanger system for a residential building

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  • Wood, Christopher J.
  • Liu, Hao
  • Riffat, Saffa B.

Abstract

Novel methods are sought to provide greater efficiency of the installation of ground heat exchangers for GSHPs (ground source heat pumps) in domestic buildings. An economically viable option is to utilise concrete foundation piles as ground heat exchangers. The objective of this study is to investigate the operation of utilising a piled foundation structure as a ground heat exchanger. A test plot of 72 m2 (ground floor area) was produced with 21 × 10 m deep concrete piles, with a single U tube pipe in each. Ground heat was extracted by a heat pump with the heat loading being varied in line with the date and the average air temperature. Over the 2007/2008 heating season this study had investigated the temperature changes in the foundation piles and the surrounding ground in addition to the heat pump operational performance. The temperature changes observed in the region of the test plot were compared with variations naturally experienced in the ground due to the seasonal climatic influence. The SPF (seasonal performance factor) of the heat pump was 3.62 and the ground temperature at a distance of 5 m from the test plot was seen to be undisturbed by the heat extraction and followed the predicted seasonal variation.

Suggested Citation

  • Wood, Christopher J. & Liu, Hao & Riffat, Saffa B., 2010. "An investigation of the heat pump performance and ground temperature of a piled foundation heat exchanger system for a residential building," Energy, Elsevier, vol. 35(12), pages 4932-4940.
    • Handle: RePEc:eee:energy:v:35:y:2010:i:12:p:4932-4940
    DOI: 10.1016/j.energy.2010.08.032
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    References listed on IDEAS

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    1. Bakirci, Kadir, 2010. "Evaluation of the performance of a ground-source heat-pump system with series GHE (ground heat exchanger) in the cold climate region," Energy, Elsevier, vol. 35(7), pages 3088-3096.
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