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Performance thermique d’un échangeur de chaleur souterrain pour une pompe à chaleur géothermique utilisant la méthode de détente directe.

Thermal performance of underground heat exchanger for ground source heat pump that uses direct expansion method.

Numéro : pap. n. 649

Auteurs : OKAZAWA R., TAKEDA T., ISHIGURO S.

Résumé

The specifications of an underground heat exchanger used for a ground source heat pump that uses the direct expansion method could not be established thus far because the refrigerant flowing in the underground heat exchanger is a gas–liquid two-phase flow accompanying evaporation and condensation that exhibits a complicated behavior. Therefore, an experiment was conducted using a U-shaped heat exchanger in which one 3/8-inch copper tube and multiple 1/4-inch copper tubes were connected at the bottom as a heat-collecting tube. In this experiment, parallel underground heat exchangers were used. We introduce this underground heat exchanger into the air-conditioner used for an actual agricultural vinyl house and describe the results of the demonstration test. The coefficient of performance in the cooling and heating operations were approximately 4.0 and 3.5, respectively, and the primary energy consumption reduction rates compared with the conventional system were 20% and 43%, respectively.

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Pages : 8

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Détails

  • Titre original : Thermal performance of underground heat exchanger for ground source heat pump that uses direct expansion method.
  • Identifiant de la fiche : 30026469
  • Langues : Anglais
  • Source : Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Date d'édition : 24/08/2019
  • DOI : http://dx.doi.org/10.18462/iir.icr.2019.0649

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