IIR document

Carbon dioxide based cascade systems for simultaneous refrigeration and heating applications.

Summary

Industries such as food processing, pharmaceutical, etc. require simultaneous refrigeration and heating. Ammonia and carbon dioxide in a single-stage system do not seem to offer an efficient solution for large temperature lifts, e.g. simultaneous refrigeration up to -50 °C and heating up to 100 °C. Cascade systems offer feasible solutions in such applications. In the paper, four system configurations have been analysed: single-stage NH3, single-stage CO2, a cascade system (NH3-CO2) with CO2 on the higher side and finally a cascade system with CO2 on the lower side. Detailed performance analysis in terms of both COP and exergetic efficiency has been carried out for simultaneous refrigeration up to -50 °C and heating of air or water up to 100 °C. As expected, the cascade systems show superior performance compared with the single stage-systems. It is also evident that an opportunity exists for the optimization of the intermediate temperature of cascade systems to maximize the COP.

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Pages: 2004-2

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Details

  • Original title: Carbon dioxide based cascade systems for simultaneous refrigeration and heating applications.
  • Record ID : 2005-1799
  • Languages: English
  • Source: Natural Working Fluids 2004: 6th IIR-Gustav Lorentzen Conference
  • Publication date: 2004/08/01

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