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Evaluation de la performance potentielle d'un cycle transcritique modifié de Voorhees au R744.

Evaluation of the potential performance of a Voorhees-modified R744 transcritical cycle.

Auteurs : CHESI A., FERRARA G., FERRARI L., et al.

Résumé

Carbon dioxide is one of the best candidates to replace ozone-depleting refrigerants, due to its safety and environmental properties. Yet, due to its low critical temperature, it must be used in a transcritical cycle, yielding high compression and expansion losses and therefore a low COP. Parallel compression is often proposed as an improvement strategy for transcritical CO2 reverse cycles, in order to limit expansion losses and raise the COP. Moreover Voorhees has proposed a modification of the reciprocating compressor which would theoretically permit benefiting from the advantages of parallel compression without the need of a second compressor. The aim of this work is to analytically assess the performance of a Voorhees modified cycle, thoroughly considering the effects that partial admission, admission port position and gas re-expansion from clearance volume have on COP and cooling capacity at different temperature conditions. Moreover, a parameter is defined to quantify compressor irreversibility, according to what isentropic efficiency represent for standard single-stage compressors. The obtained performance are then compared to those of an optimised parallel compression cycle and to the single-stage transcritical cycle, in order to evaluate the opportunity of using such a technology and to find the conditions (temperatures and pressures) by which its potential advantages are most exploited.

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Disponible

  • Prix public

    20 €

  • Prix membre*

    15 €

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : Evaluation of the potential performance of a Voorhees-modified R744 transcritical cycle.
  • Identifiant de la fiche : 2011-0036
  • Langues : Anglais
  • Sujet : Réglementation
  • Source : IIR/Eurotherm sustainable refrigeration and heat pump technology conference. Proceedings of the Eurotherm Seminar No. 88, Stockholm, Sweden, June 13-16, 2010.
  • Date d'édition : 13/06/2010

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