Documents disponibles écrits par cet auteur

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]  in International 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

Impact of classical assumptions in modelling a microchannel gas cooler / Santiago Martínez-Ballester in International journal of refrigeration, Vol. 34 N° 8 (Décembre 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 8 (Décembre 2011) . - pp. 1898–1910 Titre : Impact of classical assumptions in modelling a microchannel gas cooler Titre original : Impact des hypothèses classiques sur la modélisation d'un refroidisseur de gaz à microcanaux Type de document : texte imprimé Auteurs : Santiago Martínez-Ballester, Auteur ; José-M. Corberán, Auteur ; José Gonzálvez-Maciá, Auteur Année de publication : 2012 Article en page(s) : pp. 1898–1910 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Heat  exchanger  Modelling  Simulation  Microchannel  Fin  Gas  cooler Résumé : Most of the current air-to-refrigerant heat exchanger models use the classic ɛ-NTU approach, or some of its assumptions. These models do not account for longitudinal heat conduction in the tube and the fin, and the heat conduction between different tubes. This paper presents a more fundamental numerical approach to heat exchanger modelling which takes into account the 2D longitudinal heat conduction in any element, does not apply the fin theory, and captures a more detailed representation of air properties. Using the fundamental numerical approach, the paper assesses the impact of the traditional heat exchanger model assumptions when modelling a microchannel gas cooler working with CO2. The study revealed significant differences in capacity predictions depending on the ɛ-NTU relationship adopted. Large errors in capacity prediction of individual tubes occurred due to the adiabatic-fin-tip assumption when the neighbouring tubes were of different temperature. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711001782# [article] Impact of classical assumptions in modelling a microchannel gas cooler = Impact des hypothèses classiques sur la modélisation d'un refroidisseur de gaz à microcanaux [texte imprimé] / Santiago Martínez-Ballester, Auteur ; José-M. Corberán, Auteur ; José Gonzálvez-Maciá, Auteur . - 2012 . - pp. 1898–1910. Génie mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 8 (Décembre 2011) . - pp. 1898–1910 Mots-clés : Heat  exchanger  Modelling  Simulation  Microchannel  Fin  Gas  cooler Résumé : Most of the current air-to-refrigerant heat exchanger models use the classic ɛ-NTU approach, or some of its assumptions. These models do not account for longitudinal heat conduction in the tube and the fin, and the heat conduction between different tubes. This paper presents a more fundamental numerical approach to heat exchanger modelling which takes into account the 2D longitudinal heat conduction in any element, does not apply the fin theory, and captures a more detailed representation of air properties. Using the fundamental numerical approach, the paper assesses the impact of the traditional heat exchanger model assumptions when modelling a microchannel gas cooler working with CO2. The study revealed significant differences in capacity predictions depending on the ɛ-NTU relationship adopted. Large errors in capacity prediction of individual tubes occurred due to the adiabatic-fin-tip assumption when the neighbouring tubes were of different temperature. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711001782#

Oil type influence on the optimal charge and performance of a propane chiller / Israel Martínez-Galván in International journal of refrigeration, Vol. 34 N° 4 (Juin 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 4 (Juin 2011) . - pp. 1000-1007 Titre : Oil type influence on the optimal charge and performance of a propane chiller Titre original : L'influence du type d'huile sur la charge optimale et la performance d'un refroidisseur au propane Type de document : texte imprimé Auteurs : Israel Martínez-Galván, Auteur ; José Gonzálvez-Maciá, Auteur ; José-M. Corberán, Auteur Année de publication : 2011 Article en page(s) : pp. 1000-1007 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Propane  Water  chiller  Oil  Refrigerating  system  Refrigerant  Charge Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The paper presents the experimental results of a charge optimization study of a water-to-water chiller with two different oils: Mineral and POE. The employed chiller is a prototype which works with propane as refrigerant and provides for a cooling capacity of approximately 16 kW. A complete charge optimization study was performed for two different oils: mineral ISO-VG 68 and POE ISO-VG 22. The study covered a wide range of variation of condensation temperatures, all around the typical operating conditions for AC applications. The obtained performance and compressor efficiencies are studied and discussed to explain the observed differences due to the oil type. The main conclusions are that the optimal charge is strongly different, depending on the solubility of the refrigerant into the oil, and that the POE oil seems to lead to better unit performance. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000259 [article] Oil type influence on the optimal charge and performance of a propane chiller = L'influence du type d'huile sur la charge optimale et la performance d'un refroidisseur au propane [texte imprimé] / Israel Martínez-Galván, Auteur ; José Gonzálvez-Maciá, Auteur ; José-M. Corberán, Auteur . - 2011 . - pp. 1000-1007. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 4 (Juin 2011) . - pp. 1000-1007 Mots-clés : Propane  Water  chiller  Oil  Refrigerating  system  Refrigerant  Charge Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The paper presents the experimental results of a charge optimization study of a water-to-water chiller with two different oils: Mineral and POE. The employed chiller is a prototype which works with propane as refrigerant and provides for a cooling capacity of approximately 16 kW. A complete charge optimization study was performed for two different oils: mineral ISO-VG 68 and POE ISO-VG 22. The study covered a wide range of variation of condensation temperatures, all around the typical operating conditions for AC applications. The obtained performance and compressor efficiencies are studied and discussed to explain the observed differences due to the oil type. The main conclusions are that the optimal charge is strongly different, depending on the solubility of the refrigerant into the oil, and that the POE oil seems to lead to better unit performance. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000259