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A critical analysis of the CO2 Plank transcritical refrigeration cycle under extreme ambient conditions.

Number: 1167

Author(s) : ROSSETTI A., FABRIS F., MARINETTI S., MINETTO S.

Summary

Extreme temperature conditions are becoming frequent also in temperate areas. While carbon dioxide is spreading all over the world, as a safe and environmentally friendly refrigerant, there is an increasing need for making CO2 cycle efficient also under high ambient temperature, while assuring affordability, serviceability and cost ompetitiveness.
The Plank transcritical cycle involves heat rejection at two different pressure levels: heat is first rejected at a pressure lower than the optimal one of corresponding simple cycle, thus resulting in reduced compression ratio, then pressure is increased by a pump, to meet the optimal rejection pressure as required by the secondary fluid thermal flow capacity.
In this paper, thermodynamic analysis of a CO2 refrigeration cycle identifies optimal heat rejection pressures under extreme ambient temperature. By numerical simulations the practical implementation of the cycle is critically discussed, considering finite heat rejection exchange areas. Considerations related to the relative sizing of the two gas coolers and comparison with simple compression cycle are presented.

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Pages: 12 p.

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Details

  • Original title: A critical analysis of the CO2 Plank transcritical refrigeration cycle under extreme ambient conditions.
  • Record ID : 30034200
  • Languages: English
  • Source: 1st IIR International Conference on Refrigeration Adapting to Rising Temperatures
  • Publication date: 2025/08
  • DOI: http://dx.doi.org/10.18462/iir.adaptation.2024.1167

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