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Downward two-phase flow applications for a non-conventional heat pump (+ erratum).

Author(s) : AROSIO S., CARLEVARO R., GUILIZZONI M.

Type of article: Article, IJR article

Summary

A non-conventional heat pump working by a difference in density between two branches of a hydraulic vertical loop has been described. This system called thermogravimetric heat pump, TGHP, operates with a non-conventional regenerative thermodynamic cycle which remarkably improves COP values. The lower density in the 'downward branch' is obtained by a liquid-vapour two-phase flow. Performances and main geometrical characteristic trends varying the minimum cycle temperature between 15 and 25 °C and the user temperature, in the range 60-70 °C. The carrier fluid is demineralized water; according to the peculiar working fluid, PP 50, HFC134a and HFC338cca, different solutions can be obtained, such as for 10-12 storey buildings or for skyscrapers. Yet, the results obtained with HFC338cca must be accepted with some caution while waiting for a better characterization of such fluid. Chemical compatibility, thermal stability, environmental impact have been also taken into account in the choice of the operating couple, carrier fluid working fluid. While the thermodynamic conversion process is non-conventional, the TGHP can be assembled by standardised technology. The compressor of a conventional plant is here replaced by a feeding pump and COP values obtained through a regenerative TGHP are globally larger than those of a common heat pump.

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Pages: 629-638

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Details

  • Original title: Downward two-phase flow applications for a non-conventional heat pump (+ erratum).
  • Record ID : 2004-3014
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 27 - n. 6
  • Publication date: 2004/09

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