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Positive displacement carbon dioxide expansion machines: chances and limitations.

Author(s) : KRUSE H., RÜSSMANN H., MARTIN E., et al.

Summary

Over the past few years, carbon dioxide has experienced a revival after it had been re-introduced by Lorentzen. In contrast to conventional refrigeration cycles, the expansion of CO2 in refrigeration machines is a potential source of energy efficiency improvement, when the expansion energy can be put to practical use. Various efforts to realize expanders for CO2 have been reported at Purdue and IIR conferences. At FKW, a simple reciprocating CO2 expansion machine without special valve- or slot-control has been studied as previously designed by Doll and Eder for cryogenic helium expansion. This simple kind of charge and discharge control works without any additional control components except the piston and also allows dead volume capacity control. With a flexible simulation program for expansion machines, thermodynamic calculations were performed. The results of these calculations and the design of the machine will be described and discussed in the presentation as well as experimental investigations concerning the gained work both in transcritical two-phase operation and in the superheated single-phase region at comparable pressures. From these results conclusions will be drawn concerning the chances and limitations of the application of positive displacement expansion machines of the reciprocating and rotating types.

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Details

  • Original title: Positive displacement carbon dioxide expansion machines: chances and limitations.
  • Record ID : 2007-1948
  • Languages: English
  • Source: 2006 Purdue Conferences. 18th International Compressor Engineering Conference at Purdue & 11th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Publication date: 2006/07/17

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