Documents disponibles écrits par cet auteur

Ammonia–water desorption heat and mass transfer in microchannel devices / Matthew D. Determan in International journal of refrigeration, Vol. 34 N° 5 (Août 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 5 (Août 2011) . - pp. 1197-1208 Titre : Ammonia–water desorption heat and mass transfer in microchannel devices Titre original : Transfert de chaleur et de masse dans un désorbeur à ammoniac-eau à microcanaux Type de document : texte imprimé Auteurs : Matthew D. Determan, Auteur ; Srinivas Garimella, Auteur Année de publication : 2011 Article en page(s) : pp. 1197-1208 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Desorption  Miniaturization  Mass  transfer  Microchannel  Heat  pump Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper presents the results of an experimentally validated model for the prediction of local heat and mass transfer rates in a microchannel ammonia–water desorber. The desorber is an extremely compact 178 mm × 178 mm × 0.508 m tall component capable of transferring the required heat load (∼17.5 kW) for a residential heat pump system. The model predicts temperature, concentration and mass flow rate profiles through the desorber, as well as the effective wetted area of the heat transfer surface. Previous experimental and analytical research by the authors demonstrated the performance of this same microchannel geometry as an absorber. Together, these studies show that this compact geometry is suitable for all components in an absorption heat pump, which would enable the increased use of absorption technology in the small-capacity heat pump market. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S014070071100048X [article] Ammonia–water desorption heat and mass transfer in microchannel devices = Transfert de chaleur et de masse dans un désorbeur à ammoniac-eau à microcanaux [texte imprimé] / Matthew D. Determan, Auteur ; Srinivas Garimella, Auteur . - 2011 . - pp. 1197-1208. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 5 (Août 2011) . - pp. 1197-1208 Mots-clés : Desorption  Miniaturization  Mass  transfer  Microchannel  Heat  pump Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper presents the results of an experimentally validated model for the prediction of local heat and mass transfer rates in a microchannel ammonia–water desorber. The desorber is an extremely compact 178 mm × 178 mm × 0.508 m tall component capable of transferring the required heat load (∼17.5 kW) for a residential heat pump system. The model predicts temperature, concentration and mass flow rate profiles through the desorber, as well as the effective wetted area of the heat transfer surface. Previous experimental and analytical research by the authors demonstrated the performance of this same microchannel geometry as an absorber. Together, these studies show that this compact geometry is suitable for all components in an absorption heat pump, which would enable the increased use of absorption technology in the small-capacity heat pump market. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S014070071100048X

Heat - and mass - transfer kinetics of carbon dioxide capture using sorbent - loaded hollow fibers / Matthew D. Determan in Industrial & engineering chemistry research, Vol. 51 N° 1 (Janvier 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 495–502 Titre : Heat - and mass - transfer kinetics of carbon dioxide capture using sorbent - loaded hollow fibers Type de document : texte imprimé Auteurs : Matthew D. Determan, Auteur ; Dhruv C. Hoysall, Auteur ; Srinivas Garimella, Auteur Année de publication : 2012 Article en page(s) : pp. 495–502 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Mass  transfer  Kinetics Résumé : Sorbent-loaded hollow fibers operating in a rapid temperature-swing adsorption cycle are a unique platform for the capture of CO2 from power plants. They are ideally suited for heat recovery strategies that will reduce the operating costs of capture facilities. Accurate estimates of the fiber-level heat- and mass-transfer kinetics are critical for the design and implementation of these systems. A detailed coupled heat- and mass-transfer model of the adsorption process in sorbent-loaded fibers is developed here. The effects of varying fiber geometry on the heat- and mass-transfer kinetics are presented. The rapid diffusion and adsorption in the fiber and the direct cooling of the fibers will enable efficient capture of CO2, as well as substantial recovery of the sensible heat capacity of the beds, thus reducing energy costs of the thermal-swing adsorption process. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201380r [article] Heat - and mass - transfer kinetics of carbon dioxide capture using sorbent - loaded hollow fibers [texte imprimé] / Matthew D. Determan, Auteur ; Dhruv C. Hoysall, Auteur ; Srinivas Garimella, Auteur . - 2012 . - pp. 495–502. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 495–502 Mots-clés : Mass  transfer  Kinetics Résumé : Sorbent-loaded hollow fibers operating in a rapid temperature-swing adsorption cycle are a unique platform for the capture of CO2 from power plants. They are ideally suited for heat recovery strategies that will reduce the operating costs of capture facilities. Accurate estimates of the fiber-level heat- and mass-transfer kinetics are critical for the design and implementation of these systems. A detailed coupled heat- and mass-transfer model of the adsorption process in sorbent-loaded fibers is developed here. The effects of varying fiber geometry on the heat- and mass-transfer kinetics are presented. The rapid diffusion and adsorption in the fiber and the direct cooling of the fibers will enable efficient capture of CO2, as well as substantial recovery of the sensible heat capacity of the beds, thus reducing energy costs of the thermal-swing adsorption process. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201380r

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

Intraparticle mass transfer in adsorption heat pumps / Alexander Raymond in Journal of heat transfer, Vol. 133 N° 4 (Avril 2011) 

Public ISBD [article]  in Journal of heat transfer > Vol. 133 N° 4 (Avril 2011) . - pp. [042001/1-13] Titre : Intraparticle mass transfer in adsorption heat pumps : limitations of the linear driving force approximation Type de document : texte imprimé Auteurs : Alexander Raymond, Auteur ; Srinivas Garimella, Auteur Année de publication : 2011 Article en page(s) : pp. [042001/1-13] Note générale : Physique Langues : Anglais (eng) Mots-clés : Adsorption  Diffusion  Flow  simulation  Gels  Heat  pumps  Heat  transfer  Mass  transfer  Two-phase  flow Index. décimale : 536 Chaleur. Thermodynamique Résumé : Adsorption heat pumps and chillers (ADHPCs) can utilize solar or waste heat to provide space conditioning, process heating or cooling, or energy storage. In these devices, intraparticle diffusion is shown to present a significant mass transfer resistance compared with interparticle permeation. Therefore, accurate modeling of intraparticle adsorbate mass transfer is essential for the accurate prediction of overall ADHPC performance. The linear driving force (LDF) approximation is often used to model intraparticle mass transfer in place of more detailed equations because of its computational simplicity. This paper directly compares the adsorbate contents predicted using the LDF and Fickian diffusion (FD) equations for cylindrical and spherical geometries. These geometries are typical of adsorbents commonly used in adsorption refrigeration such as cylindrical activated carbon fibers (ACFs) and spherical silica gel particles. In addition to the conventional LDF approximation, an empirical LDF approximation proposed by El-Sharkawy et al. (2006, “A Study on the Kinetics of Ethanol-Activated Carbon Fiber: Theory and Experiments,” Int. J. Heat Mass Transfer, 49(17–18), pp. 3104–3110) for ACF-ethanol (cylindrical geometry) is compared with the FD solution. By analyzing the relative error of the LDF approximation compared with the FD solution for an isothermal step-change boundary condition, the conditions under which the LDF approximation agrees with the FD equation are evaluated. It is shown that for a given working pair, agreement between the LDF and FD equations is affected by diffusivity, particle radius, half-cycle time, initial adsorbate content, and equilibrium adsorbate content. A step change in surface adsorbate content for an isothermal particle is shown to be the boundary condition that yields the maximum LDF error, and therefore provides a conservative bound for the LDF error under nonisothermal conditions. The trends exhibited by the ACF-ethanol and silica gel-water working pairs are generalized through dimensionless time and dimensionless driving adsorbate content, and LDF error is mapped using these two variables. This map may be used to determine ranges of applicability of the LDF approximation in an ADHPC model. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&smode=strresults& [...] [article] Intraparticle mass transfer in adsorption heat pumps : limitations of the linear driving force approximation [texte imprimé] / Alexander Raymond, Auteur ; Srinivas Garimella, Auteur . - 2011 . - pp. [042001/1-13]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 133 N° 4 (Avril 2011) . - pp. [042001/1-13] Mots-clés : Adsorption  Diffusion  Flow  simulation  Gels  Heat  pumps  Heat  transfer  Mass  transfer  Two-phase  flow Index. décimale : 536 Chaleur. Thermodynamique Résumé : Adsorption heat pumps and chillers (ADHPCs) can utilize solar or waste heat to provide space conditioning, process heating or cooling, or energy storage. In these devices, intraparticle diffusion is shown to present a significant mass transfer resistance compared with interparticle permeation. Therefore, accurate modeling of intraparticle adsorbate mass transfer is essential for the accurate prediction of overall ADHPC performance. The linear driving force (LDF) approximation is often used to model intraparticle mass transfer in place of more detailed equations because of its computational simplicity. This paper directly compares the adsorbate contents predicted using the LDF and Fickian diffusion (FD) equations for cylindrical and spherical geometries. These geometries are typical of adsorbents commonly used in adsorption refrigeration such as cylindrical activated carbon fibers (ACFs) and spherical silica gel particles. In addition to the conventional LDF approximation, an empirical LDF approximation proposed by El-Sharkawy et al. (2006, “A Study on the Kinetics of Ethanol-Activated Carbon Fiber: Theory and Experiments,” Int. J. Heat Mass Transfer, 49(17–18), pp. 3104–3110) for ACF-ethanol (cylindrical geometry) is compared with the FD solution. By analyzing the relative error of the LDF approximation compared with the FD solution for an isothermal step-change boundary condition, the conditions under which the LDF approximation agrees with the FD equation are evaluated. It is shown that for a given working pair, agreement between the LDF and FD equations is affected by diffusivity, particle radius, half-cycle time, initial adsorbate content, and equilibrium adsorbate content. A step change in surface adsorbate content for an isothermal particle is shown to be the boundary condition that yields the maximum LDF error, and therefore provides a conservative bound for the LDF error under nonisothermal conditions. The trends exhibited by the ACF-ethanol and silica gel-water working pairs are generalized through dimensionless time and dimensionless driving adsorbate content, and LDF error is mapped using these two variables. This map may be used to determine ranges of applicability of the LDF approximation in an ADHPC model. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&smode=strresults& [...]

Measurement and modeling of condensation heat transfer in non-circular microchannels / Akhil Agarwal in International journal of refrigeration, Vol. 33 N° 6 (Septembre 2010) 

Public ISBD [article]  in International journal of refrigeration > Vol. 33 N° 6 (Septembre 2010) . - pp. 1169-1179 Titre : Measurement and modeling of condensation heat transfer in non-circular microchannels Titre original : Transfert de chaleur lors de la condensation à l'intérieur des micro-canaux non circulaires: mesures et modélisation Type de document : texte imprimé Auteurs : Akhil Agarwal, Auteur ; Todd M. Bandhauer, Auteur ; Srinivas Garimella, Auteur Année de publication : 2010 Article en page(s) : pp. 1169-1179 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Condensation  Microchannel  Heat  transfer  Model  Measurement  Non-circular Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Heat transfer coefficients in six non-circular horizontal microchannels (0.424 < Dh < 0.839 mm) of different shapes during condensation of refrigerant R134a over the mass flux range 150 < G < 750 kg m−2 s−1 were measured in this study. The channels included barrel-shaped, N-shaped, rectangular, square, and triangular extruded tubes, and a channel with a W-shaped corrugated insert that yielded triangular microchannels. The thermal amplification technique developed and reported in earlier work by the authors is used to measure the heat transfer coefficients across the vapor-liquid dome in small increments of vapor quality. Results from previous work by the authors on condensation flow mechanisms in microchannel geometries were used to interpret the results based on the applicable flow regimes. The effect of tube shape was also considered in deciding the applicable flow regime. A modified version of the annular-flow-based heat transfer model proposed recently by the authors for circular microchannels, with the required shear stress being calculated from a non-circular microchannel pressure drop model also reported earlier was found to best correlate the present data for square, rectangular and barrel-shaped microchannels. For the other microchannel shapes with sharp acute-angle corners, a mist-flow-based model from the literature on larger tubes was found to suffice for the prediction of the heat transfer data. These models predict the data significantly better than the other available correlations in the literature. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000149 [article] Measurement and modeling of condensation heat transfer in non-circular microchannels = Transfert de chaleur lors de la condensation à l'intérieur des micro-canaux non circulaires: mesures et modélisation [texte imprimé] / Akhil Agarwal, Auteur ; Todd M. Bandhauer, Auteur ; Srinivas Garimella, Auteur . - 2010 . - pp. 1169-1179. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 6 (Septembre 2010) . - pp. 1169-1179 Mots-clés : Condensation  Microchannel  Heat  transfer  Model  Measurement  Non-circular Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Heat transfer coefficients in six non-circular horizontal microchannels (0.424 < Dh < 0.839 mm) of different shapes during condensation of refrigerant R134a over the mass flux range 150 < G < 750 kg m−2 s−1 were measured in this study. The channels included barrel-shaped, N-shaped, rectangular, square, and triangular extruded tubes, and a channel with a W-shaped corrugated insert that yielded triangular microchannels. The thermal amplification technique developed and reported in earlier work by the authors is used to measure the heat transfer coefficients across the vapor-liquid dome in small increments of vapor quality. Results from previous work by the authors on condensation flow mechanisms in microchannel geometries were used to interpret the results based on the applicable flow regimes. The effect of tube shape was also considered in deciding the applicable flow regime. A modified version of the annular-flow-based heat transfer model proposed recently by the authors for circular microchannels, with the required shear stress being calculated from a non-circular microchannel pressure drop model also reported earlier was found to best correlate the present data for square, rectangular and barrel-shaped microchannels. For the other microchannel shapes with sharp acute-angle corners, a mist-flow-based model from the literature on larger tubes was found to suffice for the prediction of the heat transfer data. These models predict the data significantly better than the other available correlations in the literature. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000149

Measurement of absorption rates in horizontal-tube falling-film ammonia-water absorbers / Sangsoo Lee in International journal of refrigeration, Vol. 35 N° 3 (Mai 2012) 

Permalink

Microchannel component technology for system-wide application in ammonia/water absorption heat pumps / Srinivas Garimella in International journal of refrigeration, Vol. 34 N° 5 (Août 2011) 

Permalink

Modeling of pressure drop during condensation in circular and noncircular microchannels / Akhil Agarwal in Transactions of the ASME . Journal of fluids engineering, Vol. 131 N° 1 (Janvier 2009) 

Permalink

Representative results for condensation measurements at hydraulic diameters ~100 microns / Akhil Agarwal in Journal of heat transfer, Vol. 132 N° 4 (n° spécial) (Avril 2010) 

Permalink

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) 

Permalink

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) 

Permalink

Waste heat driven absorption/vapor-compression cascade refrigeration system for megawatt scale, high-flux, low-temperature cooling / Srinivas Garimella in International journal of refrigeration, Vol. 34 N° 8 (Décembre 2011) 

Permalink

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) 

Permalink

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) 

Permalink