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Performance measurements of a two stage CO2 refrigerator and SEPR comparison with low-GWP alternative.

Number: pap. n. 1290

Author(s) : CITARELLA B., MASTRULLO R., MAURO A., et al.

Summary

CO2 is a natural refrigerant whose use agrees with GWP limitations imposed by recent environmental regulations in Europe. The energy performance indexes may not fulfil the limits imposed by Ecodesign rules especially in transcritical operation. In this paper, a condensing unit working with R744 is considered. The target application is the cooling of rooms and convenience stores. It is a two-stage system working with inverter-driven rotary compressor, liquid receiver, intercooler and intermediate pressure flash gas extraction. Its cooling capacity is up to 13 kW at an evaporating temperature of -10 °C and ambient temperature of 32 °C. Energy performance is measured according to EN13215 regulation; its seasonal energy performance ratio (SEPR) is over the threshold value of 2.3 applied since 2018. In this work we report the effect on energy performance of intercooler, thermodynamic analysis of main factors of influence and a comparison of seasonal performance with a unit designed for the same application employing a low-GWP class A1 synthetic refrigerant.

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Pages: 8

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Details

  • Original title: Performance measurements of a two stage CO2 refrigerator and SEPR comparison with low-GWP alternative.
  • Record ID : 30026094
  • Languages: English
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.1290

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