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Testing and analyzing on P-V diagram of CO2 a rolling piston expander.

Author(s) : ZENG X., MA Y., LIU S., et al.

Summary

Developing high efficient expander replacing throttle valve is one of the effective methods of improving performance of CO2 transcritical refrigeration cycle. Testing on P-T and P-V diagram of CO2 rolling piston expander is discussed. The results show that expansion work in P-V diagram agree with practical recovery power. It is also shown that three different expansion processes can be occurred in expander. Owing to the theoretical expansion Vr in expander is constant after manufacturing, the expander will normal expand if the expansion ratio in practical working conditions equals to Vr; while the expansion ratio is larger than Vr, over-expansion will be produced; under-expansion may be generated as the expansion ratio is lower than Vr. Therefore, some measures that overcoming over-expansion and under-expansion to match the practical work condition of expander are discussed.

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Pages: ICR07-B2-431

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Details

  • Original title: Testing and analyzing on P-V diagram of CO2 a rolling piston expander.
  • Record ID : 2007-2572
  • 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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