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Étude expérimentale d'un cycle de compresseur biétagé au R744 pour le transport frigorifique.

Experimental investigation of a R744 two-stage compressor cycle for transport refrigeration.

Numéro : pap. S3-P4

Auteurs : MÖHLENKAMP A., LEMKE N., KÖHLER J.

Résumé

State of the art in transport refrigeration is the single-stage vapour compression cycle with the synthetic re-frigerants R404A and R410A, which have both a high Global Warming Potential (GWP). Current research activities focus amongst others on new energy efficient vapour compression cycles and the application of low GWP-refrigerants. Two-stage compressors enable a broader variety of inter-stage configurations. A two-stage vapour compression cycle with an internal heat exchanger at medium pressure is a widely used inter-stage system at low and medium evaporating temperatures in commercial refrigeration. This cycle leads to a considerable increase of the system’s energy efficiency compared to a single-stage unit, especially for R744 in combination with low temperature applications. Due to its thermodynamic properties, the natural refriger-ant R744 with GWP=1 might be an eco-friendly and competitive alternative to the commonly used synthetic high-GWP-refrigerants R404A and R410A. This paper shows the experimental results of an R744 two-stage compression refrigeration test unit with an internal heat exchanger at medium pressure for transport refrigeration. The test unit provides simultaneous cooling and freezing for multi-compartment vehicles at two different pressure levels: at medium pressure for chilled food and at low pressure for frozen food. The design of the system is based on a commercial transport refrigeration system whereas the refrigeration components are specially built for R744. First measurements at an ambient temperature of 30°C are presented and discussed.

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Format PDF

Pages : 8 p.

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Détails

  • Titre original : Experimental investigation of a R744 two-stage compressor cycle for transport refrigeration.
  • Identifiant de la fiche : 30007200
  • Langues : Anglais
  • Source : 2nd IIR International Conference on Sustainability and the Cold Chain. Proceedings: Paris, France, April 2-4, 2013.
  • Date d'édition : 02/04/2013

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