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Energy efficiency comparison of the CO2 cascade and the R404A and R22 conventional system for supermarkets.

Author(s) : SILVA A., ALMEIDA E., BANDARRA FILHO E. P.

Summary

This presentation focuses on the energy efficiency of three different systems used in supermarket applications. The refrigeration systems consist of a cascade system (CO2/HFC-404A) with carbon dioxide for subcritical operation and HFC-404A in the high stage temperature (pump circuit for normal refrigeration and direct expansion for deep-freezing), and also HFC-404A and HCFC-22 with direct expansion systems. The cascade system presents a lower refrigerant charge, 47 kg of both fluids, which represents less than a half of the refrigerant charge of the other systems. An important factor is the total GWP in the case of leakage, where the impact in the atmosphere of the cascade system operating with CO2 was much less than the direct expansion systems.

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Pages: 2010-2

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Details

  • Original title: Energy efficiency comparison of the CO2 cascade and the R404A and R22 conventional system for supermarkets.
  • Record ID : 2010-1502
  • Languages: English
  • Subject: Regulation
  • Source: 9th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2010). Proceedings. Sydney, Australia, April 12-14, 2010.
  • Publication date: 2010/04/12

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