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CO2 cycle based on compression cooling.

Author(s) : TOUBLANC C., CLAUSSE M., TERRIER M. F., et al.

Summary

If direct greenhouse gas emissions are negligible with carbon dioxide as refrigerant, indirect emissions linked to overall system efficiency have to be as low as possible to be competitive with hydrofluorocarbons. Despite attractive thermophysical properties, the thermodynamic efficiency is quiet poor due to supercritical gas cooling. To achieve high performances, the authors propose a new cycle based on isothermal compression. They have explored different ways to get a near isothermal compression: external wall chamber cooling, internal atomised oil injection and finally multistage compression have been investigated. It appears that external cooling has nearly no effect for reciprocating compressors while oil injection allows increasing the overall efficiency by 30% depending on injection rate. Multistage intercooler compression is promising for large cooling rate, as the coefficient of performance enhances by 38% when using five compression stages. However, all possible combinations to cool carbon dioxide during compression have to be considered.

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Pages: ICR07-B1-122

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Details

  • Original title: CO2 cycle based on compression cooling.
  • Record ID : 2007-2034
  • Languages: English
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/08/21

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