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- W2103014727 abstract "Thermodynamic analysis of HFC-134a vapor-compression refrigeration cycles is investigated by both the first and second laws of thermodynamics. Second-law analysis is carried out for both two-stage and mechanical-subcooling refrigeration cycles. The analysis is performed on each of the system components to determine their individual contribution to the overall system irreversible losses. It is found that most of the losses are due to a low compressor efficiency. Irreversibilities of expansion valves and condenser are also significant. In addition, it is shown that the optimum inter-stage pressure for two-stage and mechanical-subcooling refrigeration systems is very close to the saturation pressure corresponding to the arithmetic mean of the refrigerant condensation and evaporation temperatures. These results are compared with the existing practice in the industry. Furthermore, theoretical results of a two-stage refrigeration system performance are also compared with experimental values for a CFC-22 system. On réalise l'analyse thermodynamique de cycles de refroidissement à compression de vapeur de HCF-134a, en utilisant les premier et second principes de thermodynamique. L'analyse avec le second principe est effectuée pour des cycles de sous-refroidissement mécaniques et biétages. Cette analyse est réalisée pour chacun des composants du système, afin de déterminer leur contribution propre aux pertes irréversibles du système dans son ensemble. On montre que la plupart des pertes sont dues à une moindre efficacité du compresseur. Les irréversibilités des détendeurs et du condenseur ne sont pas négligeables également. En outre, on montre aussi que la pression intermédiaire optimale pour les systémes de sous-refroidissement mécanique et biétagé est trés proche de la pression de saturation correspondant à la moyenne arithmétique des températures de condensation et d'évaporation du frigorigéne. On compare ces résultats avec les données pratiques obtenues dans 1'industrie. De plus, on compare aussi les résultats théoriques de la performance dun système de refroidissement biétagé avec les valeurs expérimentales d'un systéme fonctionnant au CFC-22." @default.
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- W2103014727 date "1996-11-01" @default.
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- W2103014727 title "Second-law-based thermodynamic analysis of two-stage and mechanical-subcooling refrigeration cycles" @default.
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- W2103014727 doi "https://doi.org/10.1016/s0140-7007(96)00045-x" @default.
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