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Améliorations apportées à une installation au cycle au CO2 transcritique fonctionnant avec deux systèmes de sous-refroidissement différents.

Improvements in a CO2 transcritical plant working with two different subcooling systems.

Numéro : pap. 1170

Auteurs : SÁNCHEZ D., CATALÁN-GIL J., LLOPIS R., et al.

Résumé

Natural refrigerant CO2 is an “old-new refrigerant” that is being implanted as a green solution against high-GWP greenhouse gases. Its particular low critical temperature makes carbon dioxide difficult to be implemented in warm countries where transcritical operating conditions are commonly achieved. In order to be competitive over artificial refrigerants, transcritical cycles must improve its levels of COP and cooling capacity by using different cycle configurations mainly focused in reducing the temperature at the gas-cooler exit. In this work, two different subcooling systems based on the use of an IHX and a dedicated mechanical subcooling, are presented and experimentally tested at a -10ºC evaporating level under two different heat rejection temperatures at the gas-cooler (30 and 35ºC). Working with IHX, the results show a maximum improvement in cooling capacity and COP ranged
between [1.9 ÷ 11.7]% and [0.8 ÷ 12.2]%, respectively, with an average increment in the discharge temperature of 11.6 K. The same tests performed with a dedicated mechanical subcooling using R600a as working fluid, brings an improvement in cooling capacity and COP ranged between [27.2 ÷ 42.8]% and [5.1 ÷ 19.3]%, respectively, with a maximum increment in the power consumption of the refrigerating plant of 20.9%.

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Format PDF

Pages : 9 p.

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Détails

  • Titre original : Improvements in a CO2 transcritical plant working with two different subcooling systems.
  • Identifiant de la fiche : 30019187
  • Langues : Anglais
  • Source : 12th IIR Gustav Lorentzen Conference on Natural Refrigerants (GL2016). Proceedings. Édimbourg, United Kingdom, August 21st-24th 2016.
  • Date d'édition : 21/08/2016
  • DOI : http://dx.doi.org/10.18462/iir.gl.2016.1170

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