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The thermal characteristics and performance of a ground heat exchanger for tropical climates

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  • Yusof, T.M.
  • Ibrahim, H.
  • Azmi, W.H.
  • Rejab, M.R.M.

Abstract

This paper presents the thermal characteristics and performance of ground heat exchanger (GHE) based on the mathematical model for tropical climate conditions. The case study is undertaken with the depth of ground, z of 2 m, air inlet temperature of 35 °C, air mass flow rate of 0.02–0.2 kg/s and different sizes of internal pipe diameters (ID). The effectiveness of the GHE is analyzed at 0.8, 0.9 and 0.99. The performance results of the GHE show that the flow rate of 0.02 kg/s gives great fluid temperature (Tf) reduction in the pipe compared with higher flow rates. However, the outlet temperature (Tout) of air at the end of the 25 m length of pipe with different flow rates tend to reach the same point with a maximum difference of only 0.36 °C for the range of the flow rates. Meanwhile, the rates of heat transfer relatively increase as the flow rates increase. Effectiveness of 0.9 has been identified that it is possible and achievable to be obtained with the 25 m length of the pipe. This finding has confirmed that the GHE has a great potential and good performance to be implemented in tropical climate countries.

Suggested Citation

  • Yusof, T.M. & Ibrahim, H. & Azmi, W.H. & Rejab, M.R.M., 2018. "The thermal characteristics and performance of a ground heat exchanger for tropical climates," Renewable Energy, Elsevier, vol. 121(C), pages 528-538.
    • Handle: RePEc:eee:renene:v:121:y:2018:i:c:p:528-538
    DOI: 10.1016/j.renene.2018.01.083
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    References listed on IDEAS

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    1. Bisoniya, Trilok Singh & Kumar, Anil & Baredar, Prashant, 2013. "Experimental and analytical studies of earth–air heat exchanger (EAHE) systems in India: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 19(C), pages 238-246.
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    3. Ascione, Fabrizio & Bellia, Laura & Minichiello, Francesco, 2011. "Earth-to-air heat exchangers for Italian climates," Renewable Energy, Elsevier, vol. 36(8), pages 2177-2188.
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