Finite cylinder-source model for energy pile heat exchangers: Effect of buried depth and heat load cyclic variations

  1. Bandos, T.V. 1
  2. Campos-Celador, Á. 1
  3. López-González, L.M. 2
  4. Sala-Lizarraga, J.M. 1
  1. 1 Universidad del País Vasco/Euskal Herriko Unibertsitatea
    info

    Universidad del País Vasco/Euskal Herriko Unibertsitatea

    Lejona, España

    ROR https://ror.org/000xsnr85

  2. 2 Universidad de La Rioja
    info

    Universidad de La Rioja

    Logroño, España

    ROR https://ror.org/0553yr311

Revista:
Applied Thermal Engineering

ISSN: 1359-4311

Ano de publicación: 2016

Volume: 96

Páxinas: 130-136

Tipo: Artigo

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DOI: 10.1016/J.APPLTHERMALENG.2015.11.073 SCOPUS: 2-s2.0-84949579979 WoS: WOS:000373863400014 GOOGLE SCHOLAR

Outras publicacións en: Applied Thermal Engineering

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Resumo

A solution to the finite cylinder-source model for the ground heat exchangers at a different buried depths that takes into account the heat capacity inside them and allows arbitrary heat rate changes is presented. Analytical expressions for the average ground temperature are derived by integrating the exact solutions over the cylinder-source depth for vertical and time-dependent changes of heat rate. The influence of buried depth variations on thermal response to a constant and uniform mean heat rate of the cylinder-source is examined by the integral mean temperature method in a self-consistent approach. In addition, approximate expressions for steady-state average temperature are derived for periodic heat rate in the long-time limit. © 2015 Elsevier Ltd. All rights reserved.