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CO2 compressor-expander analysis. Final report.

Author(s) : HUFF H. J., RADERMACHER R.

Type of monograph: Report

Summary

Carbon dioxide (CO2) is a potential substitute for HCFC refrigerants with favourable environmental properties compared to other HCFC alternatives. One of the major challenges with CO2 in air-conditioning applications is the low energy efficiency of systems at higher heat sink temperatures. The major loss in CO2 cycles is the throttling loss associated with the expansion process. The availability lost during the expansion process can be recovered with a work-producing expansion device, an expander. Theoretical studies have estimated improvements of the basic CO2 cycle in the range of 40 to 60% for outdoor temperatures of 27 to 50 °C, resulting in efficiencies competitive with or better than those of current conventional systems. The overall objective of this project is to provide the HVAC industry with elements to understand the practical performance potential of CO2 as an alternate refrigerant in residential air-conditioning applications through the implementation of an expander/compressor system. The work analytically defines the most promising approaches from a performance and feasibility standpoint. The work accounts for the requirements inherent in the integration of the selected types of expanders into CO2 systems, in order to provide a realistic evaluation of the system performance. The report can be downloaded from the Web site: www.arti-21cr.org/research/completed/index.html.

Details

  • Original title: CO2 compressor-expander analysis. Final report.
  • Record ID : 2004-3066
  • Languages: English
  • Subject: Environment
  • Publication: US Department of Commerce, NTIS (National Technical Information Service) - United states/United states
  • Publication date: 2003/03
  • Source: Source: ARTI-21CR-611-10060-01; 77 p. (21 x 29.7); fig.; tabl.; ref.; append.

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