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Comparaison expérimentale des modifications de cycle et des stratégies de régulation pour un cycle frigorifique au CO2 transcritique biétagé à deux évaporateurs.

Experimental comparison of cycle modifications and control strategies for a multi-stage two-evaporator transcritical CO2 refrigeration cycle.

Numéro : 1021

Auteurs : BARTA R. B., ZIVIANI D., GROLL E. A.

Résumé

A viable solution to decrease the environmental impact of the HVAC&R industry is the use of natural refrigerants such as Carbon Dioxide (CO2). CO2 has a global warming potential (GWP) of 1, is non-flammable, and is low cost. However, its high critical pressure and low critical temperature require advanced cycle modifications to improve the system coefficient of performance (COP) to be comparable or higher than systems utilizing conventional refrigerants. This paper presents preliminary validation of a transcritical CO2 cycle test stand that can compare six cycle architectures, as well as results from a comparison of ejector and electronic expansion valve (EXV) mode. The aim is to provide a meaningful comparison of these modifications, consisting of two stages of open economization and both EXV and ejector expansion. Preliminary experimental tests were conducted in order to quantify trade-offs between performance improvements and architecture costs. Design recommendations are provided along with future work.

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Format PDF

Pages : 6p.

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

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Détails

  • Titre original : Experimental comparison of cycle modifications and control strategies for a multi-stage two-evaporator transcritical CO2 refrigeration cycle.
  • Identifiant de la fiche : 30027889
  • Langues : Anglais
  • Sujet : Technologie, Alternatives aux HFC
  • Source : 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants (GL2020). Proceedings. Kyoto, Japon, December 7-9th 2020.
  • Date d'édition : 07/12/2020
  • DOI : http://dx.doi.org/10.18462/iir.gl.2020.1021
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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