Documents disponibles écrits par cet auteur

In-tube condensation of zeotropic fluid mixtures / Brian M. Fronk 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. 534–561 Titre : In-tube condensation of zeotropic fluid mixtures : A review Titre original : Condensation des fluides zéotropiques à l'intérieur de tubes : synthèse Type de document : texte imprimé Auteurs : Brian M. Fronk, Auteur ; Srinivas Garimella, Auteur Année de publication : 2013 Article en page(s) : pp. 534–561 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Binary  mixture;  Condensation;  Tube;  Heat  transfer;  Mass  transfer;  Modeling;  Experiments Résumé : The condensation of multi-component mixtures in tubes is critical to the function of many energy conversion processes. This paper reviews experimental and analytical studies of the coupled heat and mass transfer phenomena during condensation of different fluid mixtures in different in-tube geometries. Experimental studies on condensation of binary and higher order mixtures in vertical and horizontal smooth and enhanced tubes are discussed. For zeotropic mixtures the heat and mass transfer resistances in the vapor and liquid phases increase the overall heat transfer resistance beyond what would be expected from a weighted average of corresponding resistances for the pure components. There are significant opportunities to improve the quality of available data for new fluid combinations in smaller channels and at fine mass quality increments. Four categories of models are reviewed (1) Conservation equation (2) Non-equilibrium film theory (3) Equilibrium and (4) Empirical models. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003441 [article] In-tube condensation of zeotropic fluid mixtures = Condensation des fluides zéotropiques à l'intérieur de tubes : synthèse : A review [texte imprimé] / Brian M. Fronk, Auteur ; Srinivas Garimella, Auteur . - 2013 . - pp. 534–561. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 2 (N° spécial) (Mars 2013) . - pp. 534–561 Mots-clés : Binary  mixture;  Condensation;  Tube;  Heat  transfer;  Mass  transfer;  Modeling;  Experiments Résumé : The condensation of multi-component mixtures in tubes is critical to the function of many energy conversion processes. This paper reviews experimental and analytical studies of the coupled heat and mass transfer phenomena during condensation of different fluid mixtures in different in-tube geometries. Experimental studies on condensation of binary and higher order mixtures in vertical and horizontal smooth and enhanced tubes are discussed. For zeotropic mixtures the heat and mass transfer resistances in the vapor and liquid phases increase the overall heat transfer resistance beyond what would be expected from a weighted average of corresponding resistances for the pure components. There are significant opportunities to improve the quality of available data for new fluid combinations in smaller channels and at fine mass quality increments. Four categories of models are reviewed (1) Conservation equation (2) Non-equilibrium film theory (3) Equilibrium and (4) Empirical models. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003441

Transcritical carbon dioxide microchannel heat pump water heaters: Part I – validated component simulation modules / Christopher Goodman 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. 859-869 Titre : Transcritical carbon dioxide microchannel heat pump water heaters: Part I – validated component simulation modules Titre original : Systèmes de chauffage d'eau sanitaire à pompe à chaleur au dioxyde de carbone transcritique: Partie I – Modules de simulation des composants validés Type de document : texte imprimé Auteurs : Christopher Goodman, Auteur ; Brian M. Fronk, Auteur ; Srinivas Garimella, Auteur Année de publication : 2011 Article en page(s) : pp. 859-869 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Gas  cooler  Microchannel  Heat  pump  Transcritical  cycle  CO2 Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : An experimental and analytical study on the performance of carbon dioxide heat pumps for water heating was conducted. The performance of compact, microchannel, water-coupled gas coolers, evaporator, and suction line heat exchanger (SLHX) were evaluated in an experimental facility. Analytical heat exchanger models accounting for the flow orientation and changing CO2 thermophysical properties were developed and validated with data. Heat transfer coefficients were predicted with correlations available in the literature and local heat duty calculated using the effectiveness-NTU approach. The gas cooler, evaporator, and SLHX models predicted measured heat duties with an absolute average error of 5.5%, 1.3%, and 3.9%, respectively. Compressor isentropic and volumetric efficiency values were found to range from 56% to 67% and 62%–82%, respectively. Empirical models for compressor efficiency and power were developed from the data. The resulting component models are implemented in a system model in a companion paper (Part II). DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002768 [article] Transcritical carbon dioxide microchannel heat pump water heaters: Part I – validated component simulation modules = Systèmes de chauffage d'eau sanitaire à pompe à chaleur au dioxyde de carbone transcritique: Partie I – Modules de simulation des composants validés [texte imprimé] / Christopher Goodman, Auteur ; Brian M. Fronk, Auteur ; Srinivas Garimella, Auteur . - 2011 . - pp. 859-869. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 4 (Juin 2011) . - pp. 859-869 Mots-clés : Gas  cooler  Microchannel  Heat  pump  Transcritical  cycle  CO2 Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : An experimental and analytical study on the performance of carbon dioxide heat pumps for water heating was conducted. The performance of compact, microchannel, water-coupled gas coolers, evaporator, and suction line heat exchanger (SLHX) were evaluated in an experimental facility. Analytical heat exchanger models accounting for the flow orientation and changing CO2 thermophysical properties were developed and validated with data. Heat transfer coefficients were predicted with correlations available in the literature and local heat duty calculated using the effectiveness-NTU approach. The gas cooler, evaporator, and SLHX models predicted measured heat duties with an absolute average error of 5.5%, 1.3%, and 3.9%, respectively. Compressor isentropic and volumetric efficiency values were found to range from 56% to 67% and 62%–82%, respectively. Empirical models for compressor efficiency and power were developed from the data. The resulting component models are implemented in a system model in a companion paper (Part II). DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002768

Transcritical carbon dioxide microchannel heat pump water heaters: Part II – System simulation and optimization / Christopher Goodman 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. 870-880 Titre : Transcritical carbon dioxide microchannel heat pump water heaters: Part II – System simulation and optimization Titre original : Systèmes de chauffage d'eau sanitaire à pompe à chaleur au dioxyde de carbone transcritique : Partie II – Simulation et optimisation du système Type de document : texte imprimé Auteurs : Christopher Goodman, Auteur ; Brian M. Fronk, Auteur ; Srinivas Garimella, Auteur Année de publication : 2011 Article en page(s) : pp. 870-880 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Gas  cooler  Microchannel  Heat  pump  Transcritical  Cycle  Carbon  dioxide Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper presents the development of a transcritical CO2 heat pump water heating system model incorporating analytical heat exchanger models and an empirical compressor model. This study investigated the effects of a suction line heat exchanger (SLHX) and once-through versus recirculating water heating schemes. The once-through systems outperformed the recirculating systems by 10% for the system without an SLHX and 15% with an SLHX. However, a gas cooler twice as large is required. The SLHX was shown to benefit system performance at higher evaporator temperatures with improvements of 16.5% for the once-through and 4% for the recirculating systems. This study can be used to improve the design of microchannel based transcritical CO2 heat pumps; evaluate the impact of varying water inlet temperature, desired outlet temperature and evaporation temperature on system performance; and quantify the effect of differential diurnal electricity rates on system operating costs for these different operation schemes. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002756 [article] Transcritical carbon dioxide microchannel heat pump water heaters: Part II – System simulation and optimization = Systèmes de chauffage d'eau sanitaire à pompe à chaleur au dioxyde de carbone transcritique : Partie II – Simulation et optimisation du système [texte imprimé] / Christopher Goodman, Auteur ; Brian M. Fronk, Auteur ; Srinivas Garimella, Auteur . - 2011 . - pp. 870-880. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 4 (Juin 2011) . - pp. 870-880 Mots-clés : Gas  cooler  Microchannel  Heat  pump  Transcritical  Cycle  Carbon  dioxide Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper presents the development of a transcritical CO2 heat pump water heating system model incorporating analytical heat exchanger models and an empirical compressor model. This study investigated the effects of a suction line heat exchanger (SLHX) and once-through versus recirculating water heating schemes. The once-through systems outperformed the recirculating systems by 10% for the system without an SLHX and 15% with an SLHX. However, a gas cooler twice as large is required. The SLHX was shown to benefit system performance at higher evaporator temperatures with improvements of 16.5% for the once-through and 4% for the recirculating systems. This study can be used to improve the design of microchannel based transcritical CO2 heat pumps; evaluate the impact of varying water inlet temperature, desired outlet temperature and evaporation temperature on system performance; and quantify the effect of differential diurnal electricity rates on system operating costs for these different operation schemes. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002756

Water-coupled carbon dioxide microchannel gas cooler for heat pump water heaters. Part I - Experiments / Brian M. Fronk in International journal of refrigeration, Vol. 34 N° 1 (Janvier 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 1 (Janvier 2011) . - pp. 7-16 Titre : Water-coupled carbon dioxide microchannel gas cooler for heat pump water heaters. Part I - Experiments Titre original : Refroidisseur de gaz à microcanaux au dioxyde de carbone pour les pompes à chaleur utilisées pour chauffer de l'eau sanitaire. Partie I - Expériences Type de document : texte imprimé Auteurs : Brian M. Fronk, Auteur ; Srinivas Garimella, Auteur Année de publication : 2011 Article en page(s) : pp. 7-16 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Heat  pump  Heating  Hot  water  Carbon  dioxide  Transcritical  cycle  Experiment  Gas  cooler  Microchannel Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : An experimental and analytical study on the performance of a compact, microchannel water- carbon dioxide (CO2) gas cooler was conducted. The gas cooler design under investigation used an array of serpentine refrigerant microchannel tubes wrapped around water passages containing offset strip fins, resulting in a generally counterflow configuration between the two fluids. Part I of this two-part paper addresses the experimental aspects. Data were obtained using an experimental heat pump facility at varying inlet conditions for three gas coolers of the same design, but different sizes. Measured heating capacity for the three gas coolers ranged from 1.5 to 6.5 kW. The results of this study are used in the companion paper (Part II) to develop a predictive heat exchanger model to optimize gas cooler design over a wide range of operating conditions, eliminating the need for expensive prototype development and testing. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000903 [article] Water-coupled carbon dioxide microchannel gas cooler for heat pump water heaters. Part I - Experiments = Refroidisseur de gaz à microcanaux au dioxyde de carbone pour les pompes à chaleur utilisées pour chauffer de l'eau sanitaire. Partie I - Expériences [texte imprimé] / Brian M. Fronk, Auteur ; Srinivas Garimella, Auteur . - 2011 . - pp. 7-16. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 1 (Janvier 2011) . - pp. 7-16 Mots-clés : Heat  pump  Heating  Hot  water  Carbon  dioxide  Transcritical  cycle  Experiment  Gas  cooler  Microchannel Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : An experimental and analytical study on the performance of a compact, microchannel water- carbon dioxide (CO2) gas cooler was conducted. The gas cooler design under investigation used an array of serpentine refrigerant microchannel tubes wrapped around water passages containing offset strip fins, resulting in a generally counterflow configuration between the two fluids. Part I of this two-part paper addresses the experimental aspects. Data were obtained using an experimental heat pump facility at varying inlet conditions for three gas coolers of the same design, but different sizes. Measured heating capacity for the three gas coolers ranged from 1.5 to 6.5 kW. The results of this study are used in the companion paper (Part II) to develop a predictive heat exchanger model to optimize gas cooler design over a wide range of operating conditions, eliminating the need for expensive prototype development and testing. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000903

Water-coupled carbon dioxide microchannel gas cooler for heat pump water heaters. Part II – Model development and validation / Brian M. Fronk in International journal of refrigeration, Vol. 34 N° 1 (Janvier 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 1 (Janvier 2011) . - pp. 17-28 Titre : Water-coupled carbon dioxide microchannel gas cooler for heat pump water heaters. Part II – Model development and validation Titre original : Refroidisseur de gaz à microcanaux sur eau souterraine pour des pompes à chaleur au dioxyde de carbone utilisées pour chauffer de l'eau sanitaire. Partie II – Développement et validation du modèle Type de document : texte imprimé Auteurs : Brian M. Fronk, Auteur ; Srinivas Garimella, Auteur Année de publication : 2011 Article en page(s) : pp. 17-28 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Heat  exchanger  Gas  cooler  Carbon  dioxide  Transcritical  cycle  Microchannel  Heat  pump  Heating  Hot  water  Modelling  Simulation Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : An experimental and analytical study on the performance of a compact, microchannel water-carbon dioxide (CO2) gas cooler was conducted. The experimental results addressed in Part I of this study are used here in Part II to develop an analytical model, utilizing a segmented approach to account for the steep gradients in the thermodynamic and transport properties of supercritical CO2. The model predicted gas cooler heat duty with an average absolute deviation of 7.5% with varying refrigerant and water inlet conditions. The segmented model reveals that near the pseudo-critical point, there is a significant local decrease in refrigerant-side thermal resistance, which yields a sharp increase in local heat duty. The impact of this spike on gas cooler performance is analyzed. Results from this study can be used to predict the effect of changing geometric parameters of the heat exchanger without the need for expensive prototype development and testing. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S014070071000109X [article] Water-coupled carbon dioxide microchannel gas cooler for heat pump water heaters. Part II – Model development and validation = Refroidisseur de gaz à microcanaux sur eau souterraine pour des pompes à chaleur au dioxyde de carbone utilisées pour chauffer de l'eau sanitaire. Partie II – Développement et validation du modèle [texte imprimé] / Brian M. Fronk, Auteur ; Srinivas Garimella, Auteur . - 2011 . - pp. 17-28. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 1 (Janvier 2011) . - pp. 17-28 Mots-clés : Heat  exchanger  Gas  cooler  Carbon  dioxide  Transcritical  cycle  Microchannel  Heat  pump  Heating  Hot  water  Modelling  Simulation Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : An experimental and analytical study on the performance of a compact, microchannel water-carbon dioxide (CO2) gas cooler was conducted. The experimental results addressed in Part I of this study are used here in Part II to develop an analytical model, utilizing a segmented approach to account for the steep gradients in the thermodynamic and transport properties of supercritical CO2. The model predicted gas cooler heat duty with an average absolute deviation of 7.5% with varying refrigerant and water inlet conditions. The segmented model reveals that near the pseudo-critical point, there is a significant local decrease in refrigerant-side thermal resistance, which yields a sharp increase in local heat duty. The impact of this spike on gas cooler performance is analyzed. Results from this study can be used to predict the effect of changing geometric parameters of the heat exchanger without the need for expensive prototype development and testing. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S014070071000109X