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Contribution des échangeurs de chaleur dans l'amélioration de la performance de la nouvelle génération de système de conditionnement d'air automobile au R744.

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

Auteurs : GIANNAVOLA M., YIN J., BULLARD C., et al.

Résumé

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%.

Détails

  • Titre original : Contribution of heat exchangers in improved performance of new generation automotive air-conditioning system with R744.
  • Identifiant de la fiche : 2005-1478
  • Langues : Anglais
  • Source : ASHRAE Transactions. 2003 Winter Meeting, Chicago, Illinois. Volume 109, part 1 + CD-ROM.
  • Date d'édition : 2003

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