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Boiling heat transfer of HFO-1234yf flowing in a smooth small-diameter horizontal tube / Shizuo Saitoh 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. 1846–1853 Titre : Boiling heat transfer of HFO-1234yf flowing in a smooth small-diameter horizontal tube Titre original : Transfert de chaleur lors de l’ébullition de HFO-1234yf à l’intérieur d’un tube horizontal lisse de faible diamètre Type de document : texte imprimé Auteurs : Shizuo Saitoh, Auteur ; Chaobin Dang, Auteur ; Yoshitaka Nakamura, Auteur Année de publication : 2012 Article en page(s) : pp. 1846–1853 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Boiling  Heat  transfer  Pressure  drop  HFO-1234yf  Tube  Small  diameter Résumé : The flow boiling heat transfer coefficient of the low-GWP (global warming potential) refrigerant HFO-1234yf inside a smooth small-diameter horizontal tube (inner diameter: 2 mm) was experimentally investigated. The local heat transfer coefficient was measured at heat fluxes of 6–24 kW m−2, mass fluxes of 100–400 kg m−2 s−1, an evaporating temperature of 288.15 K, and an inlet vapor quality of 0–0.25. The results show that the effect of heat flux on the heat transfer was large at low vapor quality, while the effect of mass flux was large at high vapor quality. The heat transfer coefficient of HFO-1234yf was almost the same as that of R-134a. The heat transfer coefficients calculated based on correlations with Saitoh et al. agreed well with the measured values compared to other correlations. The measured pressure drop agreed well with that predicted by the Lockhart–Martinelli correlation. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711001241# [article] Boiling heat transfer of HFO-1234yf flowing in a smooth small-diameter horizontal tube = Transfert de chaleur lors de l’ébullition de HFO-1234yf à l’intérieur d’un tube horizontal lisse de faible diamètre [texte imprimé] / Shizuo Saitoh, Auteur ; Chaobin Dang, Auteur ; Yoshitaka Nakamura, Auteur . - 2012 . - pp. 1846–1853. Génie mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 8 (Décembre 2011) . - pp. 1846–1853 Mots-clés : Boiling  Heat  transfer  Pressure  drop  HFO-1234yf  Tube  Small  diameter Résumé : The flow boiling heat transfer coefficient of the low-GWP (global warming potential) refrigerant HFO-1234yf inside a smooth small-diameter horizontal tube (inner diameter: 2 mm) was experimentally investigated. The local heat transfer coefficient was measured at heat fluxes of 6–24 kW m−2, mass fluxes of 100–400 kg m−2 s−1, an evaporating temperature of 288.15 K, and an inlet vapor quality of 0–0.25. The results show that the effect of heat flux on the heat transfer was large at low vapor quality, while the effect of mass flux was large at high vapor quality. The heat transfer coefficient of HFO-1234yf was almost the same as that of R-134a. The heat transfer coefficients calculated based on correlations with Saitoh et al. agreed well with the measured values compared to other correlations. The measured pressure drop agreed well with that predicted by the Lockhart–Martinelli correlation. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711001241#

Effect of PAG-type lubricating oil on heat transfer characteristics of supercritical carbon dioxide cooled inside a small internally grooved tube / Chaobin Dang in International journal of refrigeration, Vol. 33 N° 3 (Mai 2010) 

Public ISBD [article]  in International journal of refrigeration > Vol. 33 N° 3 (Mai 2010) . - pp. 558-565 Titre : Effect of PAG-type lubricating oil on heat transfer characteristics of supercritical carbon dioxide cooled inside a small internally grooved tube Titre original : Effet de l'huile lubrifiante de type PAG sur les caractéristiques du transfert de chaleur du dioxyde de carbone supercritique refroidi à l'intérieur d'un petit tube rainuré du côté interne Type de document : texte imprimé Auteurs : Chaobin Dang, Auteur ; Koji Iino, Auteur ; Eiji Hihara, Auteur Année de publication : 2010 Article en page(s) : pp. 558-565 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Carbon  dioxide  Transcritical  cycle  Experiment  Heat  transfer  Parameter  Oil  Polyalkylene  glycol  Pressure  drop Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Heat transfer characteristics of supercritical CO2 cooled inside a small internally grooved tube were investigated. The mean inner diameter (ID) and helix angle of this tube were 2 mm and 6.3°, respectively. Experiments were conducted in the pressure range of 8–10 MPa and mass flux range of 400–1200 kg m−2 s−1. The effect of PAG-type lubricating oil on the heat transfer characteristics was investigated by changing the oil concentration from 0% to 5%. The drop in the heat transfer coefficient was 30–50% and 50–70% at oil concentrations of 1% and 3%, respectively. The heat transfer coefficient of CO2 in the grooved tube was higher than that in the smooth tube at all oil concentrations tested. The experimental results indicated that the grooved tube has a large heat transfer area and facilitates the breaking up of the oil film. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700709002874 [article] Effect of PAG-type lubricating oil on heat transfer characteristics of supercritical carbon dioxide cooled inside a small internally grooved tube = Effet de l'huile lubrifiante de type PAG sur les caractéristiques du transfert de chaleur du dioxyde de carbone supercritique refroidi à l'intérieur d'un petit tube rainuré du côté interne [texte imprimé] / Chaobin Dang, Auteur ; Koji Iino, Auteur ; Eiji Hihara, Auteur . - 2010 . - pp. 558-565. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 3 (Mai 2010) . - pp. 558-565 Mots-clés : Carbon  dioxide  Transcritical  cycle  Experiment  Heat  transfer  Parameter  Oil  Polyalkylene  glycol  Pressure  drop Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Heat transfer characteristics of supercritical CO2 cooled inside a small internally grooved tube were investigated. The mean inner diameter (ID) and helix angle of this tube were 2 mm and 6.3°, respectively. Experiments were conducted in the pressure range of 8–10 MPa and mass flux range of 400–1200 kg m−2 s−1. The effect of PAG-type lubricating oil on the heat transfer characteristics was investigated by changing the oil concentration from 0% to 5%. The drop in the heat transfer coefficient was 30–50% and 50–70% at oil concentrations of 1% and 3%, respectively. The heat transfer coefficient of CO2 in the grooved tube was higher than that in the smooth tube at all oil concentrations tested. The experimental results indicated that the grooved tube has a large heat transfer area and facilitates the breaking up of the oil film. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700709002874

Flow boiling heat transfer of carbon dioxide inside a small-sized microfin tube / Chaobin Dang in International journal of refrigeration, Vol. 33 N° 4 (Juin 2010) 

Public ISBD [article]  in International journal of refrigeration > Vol. 33 N° 4 (Juin 2010) . - pp. 655-663 Titre : Flow boiling heat transfer of carbon dioxide inside a small-sized microfin tube Titre original : Transfert de chaleur lors de l'ébullition du dioxyde de carbone à l'intérieur d'un tube à microailettes de faible diamètre Type de document : texte imprimé Auteurs : Chaobin Dang, Auteur ; Nobori Haraguchi, Auteur ; Eiji Hihara, Auteur Année de publication : 2010 Article en page(s) : pp. 655-663 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Heat  exchanger  Tube  Microfin  Geometry  Carbon  dioxide  Boiling  Experiment  Heat  transfer  Pressure  drop Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This study investigated the flow boiling heat transfer of carbon dioxide inside a small-sized microfin tube (mean inner diameter: 2.0 mm; helix angle: 6.3°) at a saturation temperature of 15 °C, and heat and mass flux ranges of 4.5–18 kW m−2 and 360–720 kg m−2 s−1, respectively. Although, experimental results indicated that heat flux has a significant effect on the heat transfer coefficient, the coefficient does not always increase with mass flux, as in the case of conventional refrigerants such as HFCs or HCFCs. Under certain conditions, the heat transfer coefficient at a high mass flux was lower than that at a lower mass flux, indicating that convective heat transfer had a suppression effect on nucleate boiling. The heat transfer coefficients in the microfin tubes were 1.9∼2.3 times the values in smooth tubes of the same diameter under the same experimental conditions, and the dryout quality was much higher, ranging from 0.9 to 0.95. The experimental results indicated that using microfin tubes may considerably increase the overall heat transfer performance. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000174 [article] Flow boiling heat transfer of carbon dioxide inside a small-sized microfin tube = Transfert de chaleur lors de l'ébullition du dioxyde de carbone à l'intérieur d'un tube à microailettes de faible diamètre [texte imprimé] / Chaobin Dang, Auteur ; Nobori Haraguchi, Auteur ; Eiji Hihara, Auteur . - 2010 . - pp. 655-663. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 4 (Juin 2010) . - pp. 655-663 Mots-clés : Heat  exchanger  Tube  Microfin  Geometry  Carbon  dioxide  Boiling  Experiment  Heat  transfer  Pressure  drop Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This study investigated the flow boiling heat transfer of carbon dioxide inside a small-sized microfin tube (mean inner diameter: 2.0 mm; helix angle: 6.3°) at a saturation temperature of 15 °C, and heat and mass flux ranges of 4.5–18 kW m−2 and 360–720 kg m−2 s−1, respectively. Although, experimental results indicated that heat flux has a significant effect on the heat transfer coefficient, the coefficient does not always increase with mass flux, as in the case of conventional refrigerants such as HFCs or HCFCs. Under certain conditions, the heat transfer coefficient at a high mass flux was lower than that at a lower mass flux, indicating that convective heat transfer had a suppression effect on nucleate boiling. The heat transfer coefficients in the microfin tubes were 1.9∼2.3 times the values in smooth tubes of the same diameter under the same experimental conditions, and the dryout quality was much higher, ranging from 0.9 to 0.95. The experimental results indicated that using microfin tubes may considerably increase the overall heat transfer performance. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000174

Vapor-liquid equilibrium measurements for binary mixtures of R1234yf with R32, R125, and R134a / Takumi Kamiaka in International journal of refrigeration, Vol. 36 N° 3 (Mai 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 965–971 Titre : Vapor-liquid equilibrium measurements for binary mixtures of R1234yf with R32, R125, and R134a Titre original : Mesures de l'équilibre vapeur-liquide de mélanges binaires à base de R1234yf et de R32, R125 et R134a Type de document : texte imprimé Auteurs : Takumi Kamiaka, Auteur ; Chaobin Dang, Auteur ; Eiji Hihara, Auteur Année de publication : 2013 Article en page(s) : pp. 965–971 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Thermodynamic  property;  Equation  of  state;  R1234yf;  R32;  R125;  R134a;  Binary  mixture Résumé : Vapor–liquid equilibria (VLE) measurement results for three binary refrigerant mixtures of R1234yf with R32, R125, and R134a are presented. The VLE properties were measured at mass fractions of R1234yf from 25% to 80%. Equilibrium pressures were measured at temperatures from 273 K to 333 K at 10 K intervals for each binary refrigerant mixture. Measured data were correlated by using both the Peng–Robinson-type and Helmholtz-type equations of state combined with mixing rules. Binary interaction parameters included in each mixing rule were optimized to fit the measured VLE data of each binary mixture. It was found that the temperature glide of the refrigerant mixture R32/R1234yf was much larger than that of the other binary mixtures. Further, it was found that R134a/R1234yf had an azeotropic property around 50/50 wt%. The measured fundamental data of the vapor–liquid equilibrium are crucial for the optimization of binary refrigerant mixture systems. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712002034 [article] Vapor-liquid equilibrium measurements for binary mixtures of R1234yf with R32, R125, and R134a = Mesures de l'équilibre vapeur-liquide de mélanges binaires à base de R1234yf et de R32, R125 et R134a [texte imprimé] / Takumi Kamiaka, Auteur ; Chaobin Dang, Auteur ; Eiji Hihara, Auteur . - 2013 . - pp. 965–971. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 965–971 Mots-clés : Thermodynamic  property;  Equation  of  state;  R1234yf;  R32;  R125;  R134a;  Binary  mixture Résumé : Vapor–liquid equilibria (VLE) measurement results for three binary refrigerant mixtures of R1234yf with R32, R125, and R134a are presented. The VLE properties were measured at mass fractions of R1234yf from 25% to 80%. Equilibrium pressures were measured at temperatures from 273 K to 333 K at 10 K intervals for each binary refrigerant mixture. Measured data were correlated by using both the Peng–Robinson-type and Helmholtz-type equations of state combined with mixing rules. Binary interaction parameters included in each mixing rule were optimized to fit the measured VLE data of each binary mixture. It was found that the temperature glide of the refrigerant mixture R32/R1234yf was much larger than that of the other binary mixtures. Further, it was found that R134a/R1234yf had an azeotropic property around 50/50 wt%. The measured fundamental data of the vapor–liquid equilibrium are crucial for the optimization of binary refrigerant mixture systems. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712002034