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

Author(s) : BERTSCH S., GROLL E. A., WHITACRE K.

Summary

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.

Details

  • Original title: Modelling of a CO2 thermosiphon for a ground source heat pump application.
  • Record ID : 2006-3183
  • Languages: English
  • Source: 8th IEA Heat Pump Conference 2005: global advances in heat pump technology, applications, and markets. Conference proceedings [CD-ROM].
  • Publication date: 2005/05/02

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