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CO2 Stirling heat pump for residential use.

Author(s) : BERCHOWITZ D. M., JANSSEN M., PELLIZZARI R. O.

Summary

The free-piston Stirling engine (FPSE) is a reliable, high-efficiency small-capacity power generator often used in conjunction with a linear alternator. In this work, the FPSE concept is extended to directly drive a compressor by way of a common piston structure. The working gas is CO2, which freely mixes between the engine and the transcritical compressor cycle. Typically, FPSE have used helium as the working medium. The use of CO2 compromises the engine efficiency by about 10%. However, the resulting mechanical simplicity by not having to provide a hard separation between the working medium of the engine and compressor is compelling. Calculations are presented for US, Dutch and Japanese conditions using natural gas. It is shown that extremely high primary energy ratios are possible concomitant with reductions in CO2 emissions, particularly when coupled to a ground source. Since the device is externally heated, biomass is a possible fuel source and an example calculation is included.

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Details

  • Original title: CO2 Stirling heat pump for residential use.
  • Record ID : 2009-0860
  • Languages: English
  • Source: 2008 Purdue Conferences. 19th International Compressor Engineering Conference at Purdue & 12th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Publication date: 2008/07/14

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