Characterization of a vapor injection scroll compressor as a function of low, intermediate and high pressures and temperature conditions / E. Navarro in International journal of refrigeration, Vol. 36 N° 7 (Novembre 2013)  

Public ISBD [article]  inInternational journal of refrigeration > Vol. 36 N° 7 (Novembre 2013) . - pp. 1821–1829 Titre : Characterization of a vapor injection scroll compressor as a function of low, intermediate and high pressures and temperature conditions Titre original : Caractérisation d'un compresseur à spirale à injection de vapeur en fonction des conditions de pressions et de températures basses, moyennes et élevées Type de document : texte imprimé Auteurs : E. Navarro, Auteur ; A. Redón, Auteur ; José Gonzálvez-Maciá, Auteur Année de publication : 2014 Article en page(s) : pp. 1821–1829 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Compressor  Injection cycle  Economizer  Extreme conditions  Heat pumps Résumé : The interest in two stage cycles has increased in the last years and some compressor manufacturers have commercialized compressors adapted to work in these conditions. Nevertheless, the information supplied by them usually is limited to certain design conditions defined by the application and extrapolation to other conditions is not straightforward. In this article a test campaign of an injection scroll compressor is presented. This test campaign was divided in two parts, on the first one a wide range of evaporating and condensing pressures for the intermediate conditions recommended by the manufacturer were measured, and the compressor behavior was systematically compared with single stage compressor of the same volume. On the second part an experimental study of the influence of the intermediate conditions on the performance have been done. The study has included the evaluation of the separate influence of intermediate gas superheat, intermediate pressure and wet injection. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001175 [article] Characterization of a vapor injection scroll compressor as a function of low, intermediate and high pressures and temperature conditions = Caractérisation d'un compresseur à spirale à injection de vapeur en fonction des conditions de pressions et de températures basses, moyennes et élevées [texte imprimé] / E. Navarro, Auteur ; A. Redón, Auteur ; José Gonzálvez-Maciá, Auteur . - 2014 . - pp. 1821–1829. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 7 (Novembre 2013) . - pp. 1821–1829 Mots-clés : Compressor  Injection cycle  Economizer  Extreme conditions  Heat pumps Résumé : The interest in two stage cycles has increased in the last years and some compressor manufacturers have commercialized compressors adapted to work in these conditions. Nevertheless, the information supplied by them usually is limited to certain design conditions defined by the application and extrapolation to other conditions is not straightforward. In this article a test campaign of an injection scroll compressor is presented. This test campaign was divided in two parts, on the first one a wide range of evaporating and condensing pressures for the intermediate conditions recommended by the manufacturer were measured, and the compressor behavior was systematically compared with single stage compressor of the same volume. On the second part an experimental study of the influence of the intermediate conditions on the performance have been done. The study has included the evaluation of the separate influence of intermediate gas superheat, intermediate pressure and wet injection. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001175

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Comparative experimental study of an open piston compressor working with R-1234yf, R-134a and R-290 / E. Navarro in International journal of refrigeration, Vol. 36 N° 3 (Mai 2013)  

Public ISBD [article]  inInternational journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 768–775 Titre : Comparative experimental study of an open piston compressor working with R-1234yf, R-134a and R-290 Titre original : Etude expérimentale comparative sur un compresseur à piston ouvert fonctionnant au R-1234yf, au R-134a ou au R-290 Type de document : texte imprimé Auteurs : E. Navarro, Auteur ; I. O. Martínez-Galvan, Auteur ; J. Nohales, Auteur Année de publication : 2013 Article en page(s) : pp. 768–775 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Open compressors  Refrigerants  Hydrocarbons  R1234yf  Automotive air conditioning Résumé : Among the different alternatives proposed in the automotive field to replace R-134a and R-1234yf is a new generation fluid which has recently gained great importance for MAC (Mobile Air Conditioning) systems. This fluid has the advantage of having a low GWP (Global Warming potential) and thermodynamic properties similar to R-134a. But there is some criticism regarding the non-natural origin of the fluid and its possible long-term effects on the environment have not been studied. In that sense, hydrocarbons and particularly R-290 can be considered as alternatives. This paper presents a comparative study between R-1234yf, R-134a and R-290 for an open piston compressor at different operating conditions. The text matrix comprised two compressor speeds, evaporation temperatures from −15 °C to 15 °C and condensation temperatures from 40 °C to 65 °C. From these tests, the compressor behavior with these refrigerants has systematically been analyzed in terms of compressor efficiency, volumetric efficiency, losses to the ambient and oil-refrigerant properties. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003258 [article] Comparative experimental study of an open piston compressor working with R-1234yf, R-134a and R-290 = Etude expérimentale comparative sur un compresseur à piston ouvert fonctionnant au R-1234yf, au R-134a ou au R-290 [texte imprimé] / E. Navarro, Auteur ; I. O. Martínez-Galvan, Auteur ; J. Nohales, Auteur . - 2013 . - pp. 768–775. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 768–775 Mots-clés : Open compressors  Refrigerants  Hydrocarbons  R1234yf  Automotive air conditioning Résumé : Among the different alternatives proposed in the automotive field to replace R-134a and R-1234yf is a new generation fluid which has recently gained great importance for MAC (Mobile Air Conditioning) systems. This fluid has the advantage of having a low GWP (Global Warming potential) and thermodynamic properties similar to R-134a. But there is some criticism regarding the non-natural origin of the fluid and its possible long-term effects on the environment have not been studied. In that sense, hydrocarbons and particularly R-290 can be considered as alternatives. This paper presents a comparative study between R-1234yf, R-134a and R-290 for an open piston compressor at different operating conditions. The text matrix comprised two compressor speeds, evaporation temperatures from −15 °C to 15 °C and condensation temperatures from 40 °C to 65 °C. From these tests, the compressor behavior with these refrigerants has systematically been analyzed in terms of compressor efficiency, volumetric efficiency, losses to the ambient and oil-refrigerant properties. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003258

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