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Évaluation expérimentale des frigorigènes à faible PRP R513A, R1234yf et R436A comme alternatives au R134a dans un cycle frigorifique en cascade utilisant du R744.

Experimental evaluation of low-GWP refrigerants R513A, R1234yf and R436A as alternatives for R134a in a cascade refrigeration cycle with R744.

Auteurs : BLANCO OJEDA F. W. A., ALMEIDA QUEIROZ M. V. , MARCUCCI PICO D. F., DOS REIS PARISE J. A., BANDARRA FILHO E. P.

Type d'article : Article de la RIF

Résumé

This work presents an experimental analysis of the energy and environmental performance of low-GWP refrigerants R513A, R1234yf and R436A as alternatives for R134a in a cascade refrigeration system that operates with R744 in low-temperature cycle. An apparatus was built using a well-insulated room, where tests were carried out in a steady state condition. In addition to the typical components of a cascade cycle, an intermediate heat exchanger was used to thermally communicate the low and high temperature cycles, thus providing additional superheating and subcooling, respectively. The cooling capacity of the system ranged from 2.2 to 3.8 kW, the evaporation temperature varied from -34 to -24.5 °C and the air temperature inside the cold room ranged from -23.1 to -9.4 °C. The results revealed that the alternative refrigerants are potential substitutes for R134a in cascade refrigeration systems, showing an average increase in the CRC coefficient of performance of 3.1% for R436A, while R1234yf and R513A exhibited a reduction of 3.7% and 4.4%, respectively. The environmental impact analysis considered the scenarios of Chicago (USA) and Curitiba (Brazil), the latter being a southern Brazilian city with a wet climate throughout the year, a warm and mostly cloudy summer, and a short and cold winter. Total TEWI values, compared to those obtained with the originally designed R134a system, showed reductions in CO2 equivalent emission of 46%, 42.1% and 22.5% for refrigerants R436A, R1234yf and R513A, respectively, for the Curitiba scenario, while the values for Chicago were increments of 0.3%, 2.4% and 5.8%, respectively.

Documents disponibles

Format PDF

Pages : 175-187

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

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

Détails

  • Titre original : Experimental evaluation of low-GWP refrigerants R513A, R1234yf and R436A as alternatives for R134a in a cascade refrigeration cycle with R744.
  • Identifiant de la fiche : 30030516
  • Langues : Anglais
  • Sujet : Alternatives aux HFC
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 144
  • Date d'édition : 12/2022
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2022.08.010

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