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Modélisation d'un thermosiphon au CO2 pour une application de pompe à chaleur sol-eau.

Modelling of a CO2 thermosiphon for a ground source heat pump application.

Auteurs : BERTSCH S., GROLL E. A., WHITACRE K.

Résumé

Up to now, most ground source heat pump systems rely on a brine solution in a secondary fluid loop to extract heat from the soil. Recently, a new concept has gained interest which uses a closed, self-circulating CO2 thermosiphon to extract heat from the soil. The scope of the analysis presented in this paper is to model the two-phase counter-current annular flow behaviour of the coupled system, given the required amount of heat output and thermal characteristics of the soil. Using the theoretical model, a parameter study with respect to tube diameter was conducted to investigate trends applicable to design optimization. The results show that a major part of the pressure drop is caused by gravitation, whereas friction only needs to be considered for small diameter tubes.

Détails

  • Titre original : Modelling of a CO2 thermosiphon for a ground source heat pump application.
  • Identifiant de la fiche : 2006-3183
  • Langues : Anglais
  • Source : 8th IEA Heat Pump Conference 2005: global advances in heat pump technology, applications, and markets. Conference proceedings [CD-ROM].
  • Date d'édition : 02/05/2005

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