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Research and development of free piston expanders for transcritical CO2 refrigeration cycle.

Author(s) : LIU B., ZHANG B., PENG X., et al.

Summary

This paper presents the design and experimental validation of the free piston expanders for transcritical CO2 refrigeration cycle. A novel slider-based control scheme is put forward to control the expander inlet/outlet. The prototype expanders of the single acting and double acting type are developed successively, which are then experimentally validated using air or CO2 as working fluid in different working conditions. The experimental results show that the double acting free piston expander can work more steadily in much wider range of pressure difference than the single acting type, and its frequency is approximately linear with the pressure difference through the expander. For the double acting free piston expander operating in the air system, the optimal frequency exists in the range of 10 to 17 Hz, and the isentropic efficiency is estimated to be about 62% at the high-low pressures of 0.78 and 0.33 MPa respectively. Further research of the double acting free piston expander is ongoing in the CO2 cycles.

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Pages: ICR07-B2-920

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Details

  • Original title: Research and development of free piston expanders for transcritical CO2 refrigeration cycle.
  • Record ID : 2007-2568
  • Languages: English
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/08/21

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