Documents disponibles écrits par cet auteur

Performance of a large capacity propane heat pump with low charge heat exchangers / Alberto Cavallini in International journal of refrigeration, Vol. 33 N° 2 (Mars 2010) 

Public ISBD [article]  in International journal of refrigeration > Vol. 33 N° 2 (Mars 2010) . - pp. 242-250 Titre : Performance of a large capacity propane heat pump with low charge heat exchangers Titre original : Performance d’une pompe à chaleur au propane d’une grande puissance avec des échangeurs de chaleur à faible charge Type de document : texte imprimé Auteurs : Alberto Cavallini, Auteur ; Enrico Da Riva, Auteur ; Davide Del Col, Auteur Année de publication : 2011 Article en page(s) : pp. 242-250 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Heat  pump  Water  source  Compression  system  Propane  Experiment  Performance  Micro-channel  Reduction  Refrigerant  charge Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The experimental performance of a 100 kW heat pump using propane is presented. The charge minimization is a priority in the design of such a device and thus shell-and-tube heat exchangers using minichannels and providing low charge have been installed in the unit, along with conventional brazed plate heat exchangers, in order to compare different working configurations, both in terms of energy efficiency and refrigerant charge. The performance when using the minichannel condenser is here compared to the one obtained when using a brazed plate condenser and the influence of a minichannel internal heat exchanger on the performance of the equipment is measured and discussed. It is shown that a 100 kW heat pump without a liquid receiver could be run with around 3 kg of propane using a plate condenser and a plate evaporator. Using the minichannel condenser, around 0.8 kg reduction can be obtained with a negligible performance loss. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700709002448 [article] Performance of a large capacity propane heat pump with low charge heat exchangers = Performance d’une pompe à chaleur au propane d’une grande puissance avec des échangeurs de chaleur à faible charge [texte imprimé] / Alberto Cavallini, Auteur ; Enrico Da Riva, Auteur ; Davide Del Col, Auteur . - 2011 . - pp. 242-250. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 2 (Mars 2010) . - pp. 242-250 Mots-clés : Heat  pump  Water  source  Compression  system  Propane  Experiment  Performance  Micro-channel  Reduction  Refrigerant  charge Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The experimental performance of a 100 kW heat pump using propane is presented. The charge minimization is a priority in the design of such a device and thus shell-and-tube heat exchangers using minichannels and providing low charge have been installed in the unit, along with conventional brazed plate heat exchangers, in order to compare different working configurations, both in terms of energy efficiency and refrigerant charge. The performance when using the minichannel condenser is here compared to the one obtained when using a brazed plate condenser and the influence of a minichannel internal heat exchanger on the performance of the equipment is measured and discussed. It is shown that a 100 kW heat pump without a liquid receiver could be run with around 3 kg of propane using a plate condenser and a plate evaporator. Using the minichannel condenser, around 0.8 kg reduction can be obtained with a negligible performance loss. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700709002448

Performance of a semi-hermetic reciprocating compressor with propane and mineral oil / Enrico Da Riva in International journal of refrigeration, Vol. 34 N° 3 (Mai 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 3 (Mai 2011) . - pp. 752-763 Titre : Performance of a semi-hermetic reciprocating compressor with propane and mineral oil Titre original : Performance d'un compresseur à piston semi-hermétique fonctionnant au propane et à l'huile minérale Type de document : texte imprimé Auteurs : Enrico Da Riva, Auteur ; Davide Del Col, Auteur Année de publication : 2011 Article en page(s) : pp. 752-763 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Propane  Compressor  Semi-hermetic  Reciprocating  Lubricant  Mineral  oil Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The experimental performance of a semi-hermetic reciprocating compressor working with propane as the refrigerant is reported in the present paper. Tests have been performed both with and without an internal heat exchanger between the vapour suction line and the liquid line, at different settings of the expansion valve. The suction vapour superheating is shown to improve volumetric efficiency and, therefore, global compression efficiency. Experimental results are discussed and explained by means of the high solubility of propane in the mineral oil used as the lubricant, which can cause an excessive reduction of the refrigerant–oil mixture viscosity at low suction superheating. Besides, the possibility of condensation on a cold spot inside the cylinder has also been considered. A modified version of the empirical model by Pierre (1982) for the prediction of volumetric and global compression efficiencies is proposed for propane DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002884 [article] Performance of a semi-hermetic reciprocating compressor with propane and mineral oil = Performance d'un compresseur à piston semi-hermétique fonctionnant au propane et à l'huile minérale [texte imprimé] / Enrico Da Riva, Auteur ; Davide Del Col, Auteur . - 2011 . - pp. 752-763. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 3 (Mai 2011) . - pp. 752-763 Mots-clés : Propane  Compressor  Semi-hermetic  Reciprocating  Lubricant  Mineral  oil Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The experimental performance of a semi-hermetic reciprocating compressor working with propane as the refrigerant is reported in the present paper. Tests have been performed both with and without an internal heat exchanger between the vapour suction line and the liquid line, at different settings of the expansion valve. The suction vapour superheating is shown to improve volumetric efficiency and, therefore, global compression efficiency. Experimental results are discussed and explained by means of the high solubility of propane in the mineral oil used as the lubricant, which can cause an excessive reduction of the refrigerant–oil mixture viscosity at low suction superheating. Besides, the possibility of condensation on a cold spot inside the cylinder has also been considered. A modified version of the empirical model by Pierre (1982) for the prediction of volumetric and global compression efficiencies is proposed for propane DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002884