Experimental analysis of alternative blends of refrigerants for CO2 transcritical refrigeration.


CO2 is a non-flammable and natural refrigerant that is being used extensively in commercial refrigeration systems. Due to its low critical temperature, transcritical cycles are adopted in warm regions where the use of “new” configurations is mandatory to enhance the energy cycle performance. The adoption of CO2 in stand-alone systems is scared due to the energy consumption and the cost of the cycle, which does not admit complex systems excepting suction-to-liquid heat exchanger.
Blends of CO2 with hydrocarbons or hydrofluorocarbons allow upgrading the physical properties of pure CO2, such as critical temperature, latent heat or specific volume. The effect of these changes can improve the energy performance of the system lowering the energy consumption of the compressor. According to that, this communication aims to analyse experimentally some fluids that can be mixed with CO2 to improve its performance warrantying non-flammability and a global warming potential lower than 150. The experimental energy tests were conducted in a vertical CO2 beverage cooler with three blends of CO2 (R32/CO2, R290/CO2 and R1270/CO2) at two ambient temperatures (25 and 30ºC).
The results from tests confirmed that CO2-blends allow energy saving of up to 17.2% at 25ºC and up to 12.2% at 30ºC concerning pure CO2 operation. Moreover, energy tests with R290 were introduced to determine the potential benefit of these mixtures giving as a conclusion that the energy consumption of non-flammable CO2 blends are similar to R290.

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  • Original title: Experimental analysis of alternative blends of refrigerants for CO2 transcritical refrigeration.
  • Record ID : 30028081
  • Languages: Spanish
  • Subject: HFCs alternatives
  • Source: X Congreso Ibérico y VIII Congreso Iberoamericano de Ciencias y Técnicas del Frío, CYTEF 2020.
  • Publication date: 2020/11/11


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