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Analysis and optimization of different two stage transcritical carbon dioxide cycles for heating applications.

Number: pap. ID22

Author(s) : PITARCH M., NAVARRO-PERIS E., GONZÁLVEZ J., et al.

Summary

Increased interest about environmental impact of the refrigeration technology is leading toward design solutions aimed at improving the energy efficiency of related applications and the use of eco-friendly refrigerants with low GWP. The aim of this paper is to analyze theoretically R744 air to water heat pump cycles for heating applications up to 80ºC. This work studies the following cycle configurations: two-stage with injection (with and without intermediated cooling between compressors) and single stage circuit coupled with an auxiliary subcooling circuit. Each cycle has been studied in terms of the external working conditions. The analysis has included the effect of the internal heat transfer between the different streams of refrigerant and the cycles have been optimized with regards to COP in terms of the intermediate conditions, the upper pressure and for the cases with two different streams of refrigerant, the mass flow ratio. Based on this analysis, the advantages of each configuration have been enumerated. Finally these cycles has been compared with a subcritical injection cycle working with R134a and a single stage R744 cycle for the same application, showing that the improved cycle with R744 can represent a global improvement of 15% in terms of COP depending on the application and environmental conditions.

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Pages: 8 p.

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Details

  • Original title: Analysis and optimization of different two stage transcritical carbon dioxide cycles for heating applications.
  • Record ID : 30012183
  • Languages: English
  • Source: 11th IIR Gustav Lorentzen Conference on Natural Refrigerants (GL2014). Proceedings. Hangzhou, China, August 31-September 2, 2014.
  • Publication date: 2014/08/02

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