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Contribution of heat exchangers in improved performance of new generation automotive air-conditioning system with R744.

Author(s) : GIANNAVOLA M., YIN J., BULLARD C., et al.

Summary

The paper describes results of a project designed to develop and compare the performance of a second-generation mobile R744 air-conditioning system to the first mobile R744 system tested by the authors' group. Analysis of results obtained with the first-generation system indicated many possible areas of improvement. Thus, the impetus for constructing and subsequently testing the second-generation system was to demonstrate that significant gains in system performance were possible with enhanced system components. Performance enhancements were achieved by introducing a superior compressor and improved heat exchangers. However, the most influential impact on improved performance was the introduction of a cross-counterflow gas cooler. Results of tests under similar operating conditions, including compressor speed, show an 11 to 63% increase in evaporator capacity and a 1.6 to 6.3% increase in COP. Additional tests performed under similar conditions, high-side pressure, and/or evaporator capacity illustrate COP improvements of 7 to 75%.

Details

  • Original title: Contribution of heat exchangers in improved performance of new generation automotive air-conditioning system with R744.
  • Record ID : 2005-1478
  • Languages: English
  • Source: ASHRAE Transactions. 2003 Winter Meeting, Chicago, Illinois. Volume 109, part 1 + CD-ROM.
  • Publication date: 2003

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