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Contribution of internal heat exchanger to transcritical R744 cycle performance.

Author(s) : BOEWE D. E., BULLARD C. W., YIN J. M., et al.

Summary

The paper presents results of 178 experiments evaluating the effects of internal heat exchange on the performance of a well-instrumented prototype transcritical mobile air-conditioning system using R744 (carbon dioxide) as the refrigerant. The effect on cycle efficiency is substantial, up to 25%, because of the relatively high irreversibility at the expansion device in the standard transcritical cycle. The test data were used to develop a simulation model. Finally the model was used to develop an optimal design reducing material requirements by 50% while increasing effectiveness by 10%. The cycle optimization was guided by the trade-off between heat exchanger effectiveness and suction pressure drop.

Details

  • Original title: Contribution of internal heat exchanger to transcritical R744 cycle performance.
  • Record ID : 2003-1565
  • Languages: English
  • Source: ASHRAE Transactions. 2001 annual Meeting, Cincinnati, Ohio. Volume 107, part 2 + CD-ROM.
  • Publication date: 2001/06/24
  • Document available for consultation in the library of the IIR headquarters only.

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