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Heat transfer during evaporation of R1234ze(E), R32, R410A and a mixture of R1234ze(E) and R32 inside a horizontal smooth tube / Md. Anowar Hossain in International journal of refrigeration, Vol. 36 N° 2 (N° spécial) (Mars 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 2 (N° spécial) (Mars 2013) . - pp. 465–477 Titre : Heat transfer during evaporation of R1234ze(E), R32, R410A and a mixture of R1234ze(E) and R32 inside a horizontal smooth tube Titre original : Transfert de chaleur lors de l'évaporation du R1234ze(E), du R32, du R410A et d'un mélange de R1234ze(E) et de R32 à l'intérieur d'un tube lisse horizontal Type de document : texte imprimé Auteurs : Md. Anowar Hossain, Auteur ; Yoji Onaka, Auteur ; Hasan M. M. Afroz, Auteur Année de publication : 2013 Article en page(s) : pp. 465–477 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Evaporation;  Heat  transfer  coefficient;  Horizontal  tube;  Two-phase  flow;  Mixture Résumé : This experimental study measured and compared the heat transfer coefficients during in-tube evaporation of R1234ze(E), R32, the nearly azeotropic HFC refrigerant blend R410A and a zeotropic mixture R1234ze(E)/R32 (55/45 mass %) inside a water heated double tube heat exchanger. The experiment has been carried out under the conditions of mass flux varying from 150 to 445 kg m−2 s−1, the saturation temperatures are 5 and 10 °C, over the vapor quality range 0.0–1.0. The effect of vapor quality, mass flux and saturation temperature on heat transfer coefficients have been analyzed. It is found that the experimental heat transfer coefficients of R1234ze(E) are lower than R1234ze(E)/R32 (55/45mass%), R410A and R32 by 11%, 56% and 83%, respectively, at about 0.48 vapor quality and 300 kg m−2 s−1 mass velocity. Experimental results have been compared with some well-known correlations. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712002691 [article] Heat transfer during evaporation of R1234ze(E), R32, R410A and a mixture of R1234ze(E) and R32 inside a horizontal smooth tube = Transfert de chaleur lors de l'évaporation du R1234ze(E), du R32, du R410A et d'un mélange de R1234ze(E) et de R32 à l'intérieur d'un tube lisse horizontal [texte imprimé] / Md. Anowar Hossain, Auteur ; Yoji Onaka, Auteur ; Hasan M. M. Afroz, Auteur . - 2013 . - pp. 465–477. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 2 (N° spécial) (Mars 2013) . - pp. 465–477 Mots-clés : Evaporation;  Heat  transfer  coefficient;  Horizontal  tube;  Two-phase  flow;  Mixture Résumé : This experimental study measured and compared the heat transfer coefficients during in-tube evaporation of R1234ze(E), R32, the nearly azeotropic HFC refrigerant blend R410A and a zeotropic mixture R1234ze(E)/R32 (55/45 mass %) inside a water heated double tube heat exchanger. The experiment has been carried out under the conditions of mass flux varying from 150 to 445 kg m−2 s−1, the saturation temperatures are 5 and 10 °C, over the vapor quality range 0.0–1.0. The effect of vapor quality, mass flux and saturation temperature on heat transfer coefficients have been analyzed. It is found that the experimental heat transfer coefficients of R1234ze(E) are lower than R1234ze(E)/R32 (55/45mass%), R410A and R32 by 11%, 56% and 83%, respectively, at about 0.48 vapor quality and 300 kg m−2 s−1 mass velocity. Experimental results have been compared with some well-known correlations. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712002691

Prediction of condensation pressure drop inside herringbone microfin tubes / Hasan M. M. Afroz 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. 1057-1065 Titre : Prediction of condensation pressure drop inside herringbone microfin tubes Titre original : Prévision de la chute de pression lors de la condensation à l'intérieur de tubes à micro-ailettes à chevrons Type de document : texte imprimé Auteurs : Hasan M. M. Afroz, Auteur ; Akio Miyara, Auteur Année de publication : 2011 Article en page(s) : pp. 1057-1065 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Condensation  Tube  Micro-fin  Pressure  drop  Prediction Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A generalized prediction correlation of condensation pressure drop inside herringbone microfin tubes has been proposed which includes the new empirical correlation of two-phase frictional multiplier and author’s previously proposed correlation of single-phase friction factor for herringbone microfin tubes. Three existing correlations and the newly proposed correlation of condensation pressure drop for herringbone microfin tubes have been compared with the available experimental data of five herringbone microfin tubes during condensation of R410A. From the results of overall root-mean-square (r.m.s.) deviations of relative residuals of condensation pressure drop for all tubes, proposed correlation shows best performance. Proposed correlation can also predict other experimental data of two-phase pressure drop of R410A during adiabatic two-phase flow and previously measured data of condensation pressure drop of R22 within ±20% which are not used to develop the proposed correlation. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000491 [article] Prediction of condensation pressure drop inside herringbone microfin tubes = Prévision de la chute de pression lors de la condensation à l'intérieur de tubes à micro-ailettes à chevrons [texte imprimé] / Hasan M. M. Afroz, Auteur ; Akio Miyara, Auteur . - 2011 . - pp. 1057-1065. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 4 (Juin 2011) . - pp. 1057-1065 Mots-clés : Condensation  Tube  Micro-fin  Pressure  drop  Prediction Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A generalized prediction correlation of condensation pressure drop inside herringbone microfin tubes has been proposed which includes the new empirical correlation of two-phase frictional multiplier and author’s previously proposed correlation of single-phase friction factor for herringbone microfin tubes. Three existing correlations and the newly proposed correlation of condensation pressure drop for herringbone microfin tubes have been compared with the available experimental data of five herringbone microfin tubes during condensation of R410A. From the results of overall root-mean-square (r.m.s.) deviations of relative residuals of condensation pressure drop for all tubes, proposed correlation shows best performance. Proposed correlation can also predict other experimental data of two-phase pressure drop of R410A during adiabatic two-phase flow and previously measured data of condensation pressure drop of R22 within ±20% which are not used to develop the proposed correlation. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000491