Documents disponibles écrits par cet auteur

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#

Influence of the source and sink temperatures on the optimal refrigerant charge of a water-to-water heat pump / José-M. Corberán 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. 881-892 Titre : Influence of the source and sink temperatures on the optimal refrigerant charge of a water-to-water heat pump Titre original : Influence des températures de la source et du puits thermique sur la charge en frigorigène optimale d'une pompe à chaleur eau-eau Type de document : texte imprimé Auteurs : José-M. Corberán, Auteur ; Israel Martínez-Galván, Auteur ; Santiago Martínez-Ballester, Auteur Année de publication : 2011 Article en page(s) : pp. 881-892 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Modelling  Heat  pump  Chiller  Refrigerant  Charge  Distribution  Solubility  Oil Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper presents the results of a study carried out to elucidate the influence of the source and sink temperatures on the optimal charge of a propane water-to-water 16 kW heat pump which does not incorporate any liquid receiver. The unit had been fully tested along a previous experimental study, at various refrigerant charges and different condensing temperatures. A detailed mathematical model was then employed to simulate the unit performance. The predicted results were in very good agreement with the experiments, and furthermore, showed the same trends found in a similar unit tested at the KTH (Sweden) when the evaporation temperature was progressively decreased. Then, the model was employed to study the influence of the source and sink temperatures on the optimal charge of the unit. The simulation showed that the great variation of the optimal charge with the variation of the evaporation temperature is mainly due to the variation of the amount of refrigerant in the compressor oil. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000223 [article] Influence of the source and sink temperatures on the optimal refrigerant charge of a water-to-water heat pump = Influence des températures de la source et du puits thermique sur la charge en frigorigène optimale d'une pompe à chaleur eau-eau [texte imprimé] / José-M. Corberán, Auteur ; Israel Martínez-Galván, Auteur ; Santiago Martínez-Ballester, Auteur . - 2011 . - pp. 881-892. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 4 (Juin 2011) . - pp. 881-892 Mots-clés : Modelling  Heat  pump  Chiller  Refrigerant  Charge  Distribution  Solubility  Oil Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper presents the results of a study carried out to elucidate the influence of the source and sink temperatures on the optimal charge of a propane water-to-water 16 kW heat pump which does not incorporate any liquid receiver. The unit had been fully tested along a previous experimental study, at various refrigerant charges and different condensing temperatures. A detailed mathematical model was then employed to simulate the unit performance. The predicted results were in very good agreement with the experiments, and furthermore, showed the same trends found in a similar unit tested at the KTH (Sweden) when the evaporation temperature was progressively decreased. Then, the model was employed to study the influence of the source and sink temperatures on the optimal charge of the unit. The simulation showed that the great variation of the optimal charge with the variation of the evaporation temperature is mainly due to the variation of the amount of refrigerant in the compressor oil. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000223

New non-dimensional performance parameters for the characterization of refrigeration compressors / Emilio, Navarro-Peris 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. 1951–1964 Titre : New non-dimensional performance parameters for the characterization of refrigeration compressors Titre original : Nouveaux paramètres de performance adimensionnels pour la caractérisation des compresseurs frigorifiques Type de document : texte imprimé Auteurs : Emilio, Navarro-Peris, Auteur ; José-M. Corberán, Auteur ; Luigi Falco, Auteur Année de publication : 2014 Article en page(s) : pp. 1951–1964 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Compressor;  Correlation;  Refrigerants;  Modeling;  Efficiency Résumé : Pierre (1982) developed general correlations of compressor performance for a wide range of open piston compressors based on a vast amount of data provided by the most important open compressors manufacturers at that time. Based on a wide experimental test campaign with 6 different hermetic and semihermetic compressors, this paper assesses the potential of Pierre's correlations to describe the performance of modern compressors. A full review of the functionals proposed by Pierre in order to improve their accuracy was then performed and as a result the authors found that it is possible to improve the characterization by employing a nondimensional definition of the compressor performance instead of using the efficiencies. These new parameters provide a much more consistent estimation at the borders of the correlation range than the usual correlation obtained following the ARI standard, and could be even employed to extrapolate the performance of the compressor to non-tested conditions with reasonable accuracy. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001710 [article] New non-dimensional performance parameters for the characterization of refrigeration compressors = Nouveaux paramètres de performance adimensionnels pour la caractérisation des compresseurs frigorifiques [texte imprimé] / Emilio, Navarro-Peris, Auteur ; José-M. Corberán, Auteur ; Luigi Falco, Auteur . - 2014 . - pp. 1951–1964. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 7 (Novembre 2013) . - pp. 1951–1964 Mots-clés : Compressor;  Correlation;  Refrigerants;  Modeling;  Efficiency Résumé : Pierre (1982) developed general correlations of compressor performance for a wide range of open piston compressors based on a vast amount of data provided by the most important open compressors manufacturers at that time. Based on a wide experimental test campaign with 6 different hermetic and semihermetic compressors, this paper assesses the potential of Pierre's correlations to describe the performance of modern compressors. A full review of the functionals proposed by Pierre in order to improve their accuracy was then performed and as a result the authors found that it is possible to improve the characterization by employing a nondimensional definition of the compressor performance instead of using the efficiencies. These new parameters provide a much more consistent estimation at the borders of the correlation range than the usual correlation obtained following the ARI standard, and could be even employed to extrapolate the performance of the compressor to non-tested conditions with reasonable accuracy. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001710

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