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Système à double évaporateur au R-744 pour un véhicule polyvalent à grande mobilité de l'armée américaine.

R-744 two-evaporator system for US army high mobility multi-purpose wheeled vehicle.

Auteurs : PEUKER S., HRNJAK P.

Résumé

The US Army has equipped their high mobility multipurpose wheeled vehicle with R-134a two-evaporator A/C systems and is exploring the possibility to implement a two-evaporator R-744 system. The components of the vehicle A/C systems (R-134a and R-744) were installed in the laboratory. Different breadboard versions were tested experimentally at identical ambient conditions. This paper presents how the R-744 two-evaporator breadboard system was optimized to exceed the performance of the R-134a two-evaporator breadboard system. The subject of different hardware setups (e.g. choice of expansion devices) for the R-744 two-evaporator system and their implications on performance and stability are addressed. For the case of two controllable expansion devices, the iterative process which was used to achieve good performance over a wide range of conditions, will be presented. The optimized R-744 system showed higher cooling capacity and higher COP compared to the R-134a system. The cooling capacity was increased up to 57% and the COP up to 18% compared to the R-134a system.

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  • Prix public

    20 €

  • Prix membre*

    15 €

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : R-744 two-evaporator system for US army high mobility multi-purpose wheeled vehicle.
  • Identifiant de la fiche : 2007-1732
  • Langues : Anglais
  • Source : 2006 Purdue Conferences. 18th International Compressor Engineering Conference at Purdue & 11th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Date d'édition : 17/07/2006

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