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Experimental analysis of CO2 blends for transcritical refrigeration systems.

Analyse expérimentale des mélanges à base de CO2 pour les systèmes frigorifiques transcritiques.

Résumé

Natural refrigerants as CO2 and hydrocarbons are replacing fluorinated substances in almost all refrigeration fields, especially in commercial refrigeration due to their excellent thermophysical properties and their low environmental impact. Generally, the use of hydrocarbons is restricted to small capacity or sealed systems where the refrigerant mass charge is relative low, while the adoption of CO2 is preferred on multiplex rack systems with huge charges of refrigerant (above 100 kg). Te latter requires the adoption of new technologies to overcome the issues raised by the low critical point, as the low cycle performance at high ambient temperatures.
To upgrading this issue, CO2 can be mixed with other substances such as hydrocarbons or HFCs giving as a result new blends with higher critical points and low GWP, where the main target is to ensure non-flammability conditions. Since these blends have different thermophysical properties than pure CO2, their use in transcritical cycles may provide energy savings that will reduce the complexity and the cost of these cycles. Accordingly, this communication aims to experimentally analyse different CO2 blends developed following the restrictions of non-flammability and GWP lower than 150. The experimental tests have been conducted with a vertical beverage cooler maintaining the average product temperature at 3ºC in two different ambient conditions: 25ºC, 60% of RH; 30ºC, 55% of RH.

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Experimental analysis of CO2 blends for transcritical refrigeration systems

Pages : 6

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Détails

  • Titre original : Experimental analysis of CO2 blends for transcritical refrigeration systems.
  • Identifiant de la fiche : 30027943
  • 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.2020.1151

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