Dépouillements

A review of magnetic refrigerator and heat pump prototypes built before the year 2010 / Bingfeng Yu 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. 1029-1060 Titre : A review of magnetic refrigerator and heat pump prototypes built before the year 2010 Titre original : Prototypes de réfrigérateurs et de pompes à chaleur magnétiques réalisés avant l'an 2010 Type de document : texte imprimé Auteurs : Bingfeng Yu, Auteur ; Liu, Min, Auteur ; Peter W. Egolf, Auteur Année de publication : 2010 Article en page(s) : pp. 1029-1060 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Magnetic  refrigerator  Heat  pump  Review  History Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Magnetic refrigeration, heating and power conversion technologies are interesting alternatives to the conventional refrigeration, heat pumping and different conventional energy conversion technologies. At present they all show a realistic potential to enter conventional markets, respectively to be applied in a few years. In this review paper, mainly magnetic refrigeration and magnetic heating are addressed and from these two technologies the main part is dedicated to magnetic refrigeration at room temperature. This article covers the demand of giving a complete list and description of existing magnetic heating and cooling prototypes up to the year 2010. Forty-one machines, their components and operation principles are presented in detail. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000721 [article] A review of magnetic refrigerator and heat pump prototypes built before the year 2010 = Prototypes de réfrigérateurs et de pompes à chaleur magnétiques réalisés avant l'an 2010 [texte imprimé] / Bingfeng Yu, Auteur ; Liu, Min, Auteur ; Peter W. Egolf, Auteur . - 2010 . - pp. 1029-1060. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 6 (Septembre 2010) . - pp. 1029-1060 Mots-clés : Magnetic  refrigerator  Heat  pump  Review  History Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Magnetic refrigeration, heating and power conversion technologies are interesting alternatives to the conventional refrigeration, heat pumping and different conventional energy conversion technologies. At present they all show a realistic potential to enter conventional markets, respectively to be applied in a few years. In this review paper, mainly magnetic refrigeration and magnetic heating are addressed and from these two technologies the main part is dedicated to magnetic refrigeration at room temperature. This article covers the demand of giving a complete list and description of existing magnetic heating and cooling prototypes up to the year 2010. Forty-one machines, their components and operation principles are presented in detail. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000721

Dimensionless numerical model for simulation of active magnetic regenerator refrigerator / A. Sarlah 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. 1061-1067 Titre : Dimensionless numerical model for simulation of active magnetic regenerator refrigerator Titre original : Modèle numérique adimensionnel pour la simulation d’un réfrigérateur magnétique à régénérateur actif Type de document : texte imprimé Auteurs : A. Sarlah, Auteur ; A. Poredos, Auteur Année de publication : 2010 Article en page(s) : pp. 1061-1067 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Magnetic  refrigerator  Modelling  Simulation  Heat  transfer  Regenerator Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : In order to obtain a better reliability, consistency and accuracy of results obtained with a numerical simulation of an AMRR (active magnetic regenerator refrigerator), a dimensionless numerical model was developed, which can equally be used for determination of regenerator’s heat transfer coefficient and simulation of passive heat regenerators or AMRR operation. Regenerator’s heat transfer coefficient αf, is a crucial input parameter in the simulation of AMRR operation and has a primal effect on the outcome of a solution. This paper deals with a derived dimensionless model and discusses errors involved when using different models for heat transfer coefficient and AMRR operation simulation. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000733 [article] Dimensionless numerical model for simulation of active magnetic regenerator refrigerator = Modèle numérique adimensionnel pour la simulation d’un réfrigérateur magnétique à régénérateur actif [texte imprimé] / A. Sarlah, Auteur ; A. Poredos, Auteur . - 2010 . - pp. 1061-1067. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 6 (Septembre 2010) . - pp. 1061-1067 Mots-clés : Magnetic  refrigerator  Modelling  Simulation  Heat  transfer  Regenerator Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : In order to obtain a better reliability, consistency and accuracy of results obtained with a numerical simulation of an AMRR (active magnetic regenerator refrigerator), a dimensionless numerical model was developed, which can equally be used for determination of regenerator’s heat transfer coefficient and simulation of passive heat regenerators or AMRR operation. Regenerator’s heat transfer coefficient αf, is a crucial input parameter in the simulation of AMRR operation and has a primal effect on the outcome of a solution. This paper deals with a derived dimensionless model and discusses errors involved when using different models for heat transfer coefficient and AMRR operation simulation. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000733

Carbon dioxide heat transfer coefficients and pressure drops during flow boiling / R. Mastrullo 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. 1068-1085 Titre : Carbon dioxide heat transfer coefficients and pressure drops during flow boiling : Assessment of predictive methods Titre original : Coefficients de transfert de chaleur et chute de pression du dioxyde de carbone lors de l'ébullition en écoulement : évaluation des méthodes prévisionnelles Type de document : texte imprimé Auteurs : R. Mastrullo, Auteur ; A.W. Mauro, Auteur ; A. Rosato, Auteur Année de publication : 2010 Article en page(s) : pp. 1068-1085 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Heat  exchanger  Boiling  Carbon  dioxide-review  Heat  transfer  coefficient  Pressure  drop  Comparison-experiment Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Among the alternatives to the HCFCs and HFCs, carbon dioxide emerged as one of the most promising environmentally friendly refrigerants. In past years many works were carried out about CO2 flow boiling and very different two-phase flow characteristics from conventional fluids were found. In order to assess the best predictive methods for the evaluation of CO2 heat transfer coefficients and pressure gradients in macro-channels, in the current article a literature survey of works and a collection of the results of statistical comparisons available in literature are furnished. In addition the experimental data from University of Naples are used to run a deeper analysis. Both a statistical and a direct comparison against some of the most quoted predictive methods are carried out. Methods implemented both for low–medium pressure refrigerants and specifically developed for R744 are used in the comparison. Some general indications about the choice of the predictive methods dependently on the operating conditions are given. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000757 [article] Carbon dioxide heat transfer coefficients and pressure drops during flow boiling = Coefficients de transfert de chaleur et chute de pression du dioxyde de carbone lors de l'ébullition en écoulement : évaluation des méthodes prévisionnelles : Assessment of predictive methods [texte imprimé] / R. Mastrullo, Auteur ; A.W. Mauro, Auteur ; A. Rosato, Auteur . - 2010 . - pp. 1068-1085. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 6 (Septembre 2010) . - pp. 1068-1085 Mots-clés : Heat  exchanger  Boiling  Carbon  dioxide-review  Heat  transfer  coefficient  Pressure  drop  Comparison-experiment Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Among the alternatives to the HCFCs and HFCs, carbon dioxide emerged as one of the most promising environmentally friendly refrigerants. In past years many works were carried out about CO2 flow boiling and very different two-phase flow characteristics from conventional fluids were found. In order to assess the best predictive methods for the evaluation of CO2 heat transfer coefficients and pressure gradients in macro-channels, in the current article a literature survey of works and a collection of the results of statistical comparisons available in literature are furnished. In addition the experimental data from University of Naples are used to run a deeper analysis. Both a statistical and a direct comparison against some of the most quoted predictive methods are carried out. Methods implemented both for low–medium pressure refrigerants and specifically developed for R744 are used in the comparison. Some general indications about the choice of the predictive methods dependently on the operating conditions are given. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000757

Modelling distribution of evaporating CO2 in parallel minichannels / Wiebke Brix 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. 1086-1094 Titre : Modelling distribution of evaporating CO2 in parallel minichannels Titre original : Modélisation de la distribution de CO2 en évaporation dans les microcanaux parallèles Type de document : texte imprimé Auteurs : Wiebke Brix, Auteur ; Martin Ryhl Kærn, Auteur ; Brian Elmegaard, Auteur Année de publication : 2010 Article en page(s) : pp. 1086-1094 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Heat  exchanger  Microchannel  Modelling  Simulation  Carbon  dioxide  Boiling  Two-phase  flow  Distribution Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The effects of airflow non-uniformity and uneven inlet qualities on the performance of a minichannel evaporator with parallel channels, using CO2 as refrigerant, are investigated numerically. For this purpose a one-dimensional discretised steady-state model was developed, applying well-known empirical correlations for calculating frictional pressure drop and heat transfer coefficients. An investigation of different correlations for boiling two-phase flow shows that the choice of correlation is insignificant regarding the overall results. It is shown that non-uniform airflow leads to maldistribution of the refrigerant and considerable capacity reduction of the evaporator. Uneven inlet qualities to the different channels show only minor effects on the refrigerant distribution and evaporator capacity as long as the channels are vertically oriented with CO2 flowing upwards. For horizontal channels capacity reductions are found for both non-uniform airflow and uneven inlet qualities. For horizontal minichannels the results are very similar to those obtained using R134a as refrigerant. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000824 [article] Modelling distribution of evaporating CO2 in parallel minichannels = Modélisation de la distribution de CO2 en évaporation dans les microcanaux parallèles [texte imprimé] / Wiebke Brix, Auteur ; Martin Ryhl Kærn, Auteur ; Brian Elmegaard, Auteur . - 2010 . - pp. 1086-1094. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 6 (Septembre 2010) . - pp. 1086-1094 Mots-clés : Heat  exchanger  Microchannel  Modelling  Simulation  Carbon  dioxide  Boiling  Two-phase  flow  Distribution Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The effects of airflow non-uniformity and uneven inlet qualities on the performance of a minichannel evaporator with parallel channels, using CO2 as refrigerant, are investigated numerically. For this purpose a one-dimensional discretised steady-state model was developed, applying well-known empirical correlations for calculating frictional pressure drop and heat transfer coefficients. An investigation of different correlations for boiling two-phase flow shows that the choice of correlation is insignificant regarding the overall results. It is shown that non-uniform airflow leads to maldistribution of the refrigerant and considerable capacity reduction of the evaporator. Uneven inlet qualities to the different channels show only minor effects on the refrigerant distribution and evaporator capacity as long as the channels are vertically oriented with CO2 flowing upwards. For horizontal channels capacity reductions are found for both non-uniform airflow and uneven inlet qualities. For horizontal minichannels the results are very similar to those obtained using R134a as refrigerant. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000824

Experimental analysis on pressure drop and heat transfer of a terminal fan-coil unit with ice slurry as cooling medium / José Fernández-Seara 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. 1095-1104 Titre : Experimental analysis on pressure drop and heat transfer of a terminal fan-coil unit with ice slurry as cooling medium Titre original : Analyse expérimentale de la chute de pression et du transfert de chaleur d'un ventilo-convecteur dans un système employant un coulis de glace pour le refroidissement Type de document : texte imprimé Auteurs : José Fernández-Seara, Auteur ; Rubén Diz, Auteur ; Francisco J. Uhía, Auteur Année de publication : 2010 Article en page(s) : pp. 1095-1104 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Air  conditioning  Experiment  Ice  slurry  Fan-coil  unit  Heat  transfer  Pressure  drop Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper is concerned with the experimental analysis of a standard terminal fan-coil unit with ice slurry as coolant. The ice slurry was produced from an ethylene glycol 10 wt% aqueous solution. The pressure drop measurements are presented as a function of volumetric flow rate, ice concentration and Reynolds number. The experimental friction factors are obtained and discussed. The fan-coil capacity was experimentally determined for chilled water and melting ice slurry with inlet ice fractions around 5, 10, 15 and 20 wt%, considering in each case three different fan rotation velocities. The fan-coil capacity is higher with melting ice slurry than with chilled water by factors between 3.7 and 4.9. The heat transfer analysis realizes that the air side thermal resistance controls the heat transfer process. Experimental results for the melt off rate of ice in the fan coil and the superheating at the fan-coil outlet are shown and discussed. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000836 [article] Experimental analysis on pressure drop and heat transfer of a terminal fan-coil unit with ice slurry as cooling medium = Analyse expérimentale de la chute de pression et du transfert de chaleur d'un ventilo-convecteur dans un système employant un coulis de glace pour le refroidissement [texte imprimé] / José Fernández-Seara, Auteur ; Rubén Diz, Auteur ; Francisco J. Uhía, Auteur . - 2010 . - pp. 1095-1104. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 6 (Septembre 2010) . - pp. 1095-1104 Mots-clés : Air  conditioning  Experiment  Ice  slurry  Fan-coil  unit  Heat  transfer  Pressure  drop Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper is concerned with the experimental analysis of a standard terminal fan-coil unit with ice slurry as coolant. The ice slurry was produced from an ethylene glycol 10 wt% aqueous solution. The pressure drop measurements are presented as a function of volumetric flow rate, ice concentration and Reynolds number. The experimental friction factors are obtained and discussed. The fan-coil capacity was experimentally determined for chilled water and melting ice slurry with inlet ice fractions around 5, 10, 15 and 20 wt%, considering in each case three different fan rotation velocities. The fan-coil capacity is higher with melting ice slurry than with chilled water by factors between 3.7 and 4.9. The heat transfer analysis realizes that the air side thermal resistance controls the heat transfer process. Experimental results for the melt off rate of ice in the fan coil and the superheating at the fan-coil outlet are shown and discussed. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000836

A new methodology for determination of an optimum fin shape under dehumidifying conditions / B. Kundu 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. 1105-1117 Titre : A new methodology for determination of an optimum fin shape under dehumidifying conditions Titre original : Nouvelle méthodologie pour la détermination de la géométrie optimale des ailettes sous des conditions de déshumidification Type de document : texte imprimé Auteurs : B. Kundu, Auteur Année de publication : 2010 Article en page(s) : pp. 1105-1117 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Heat  exchanger  Finned  tube  Deshumidification  Air  Calculation  Optimisation  Geometry  Fin Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : For the analytical solution of a wet fin equation, a relationship between humidity ratio and temperature of the saturation air is necessary. A linearity of this relationship instead of the actual one was chosen by many researchers for the ease of analysis of fins for a specified geometric fin. This aforementioned linear relation does not satisfy in actual case and it can be correlated by humidity ratio as a polynomial function with temperature. In this work, an exercise is devoted to determine the optimum fin profile for both fully and partially wet longitudinal fins with a nonlinear saturation curve. For this establishment, temperature distribution in the fin can be expressed by a class of power law. From the optimization analysis, an optimality criterion is setup individually for the fully and partially wet surface conditions. The optimum fin profile and design variables have been determined as a function of thermo-psychrometric parameters. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S014070071000071X [article] A new methodology for determination of an optimum fin shape under dehumidifying conditions = Nouvelle méthodologie pour la détermination de la géométrie optimale des ailettes sous des conditions de déshumidification [texte imprimé] / B. Kundu, Auteur . - 2010 . - pp. 1105-1117. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 6 (Septembre 2010) . - pp. 1105-1117 Mots-clés : Heat  exchanger  Finned  tube  Deshumidification  Air  Calculation  Optimisation  Geometry  Fin Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : For the analytical solution of a wet fin equation, a relationship between humidity ratio and temperature of the saturation air is necessary. A linearity of this relationship instead of the actual one was chosen by many researchers for the ease of analysis of fins for a specified geometric fin. This aforementioned linear relation does not satisfy in actual case and it can be correlated by humidity ratio as a polynomial function with temperature. In this work, an exercise is devoted to determine the optimum fin profile for both fully and partially wet longitudinal fins with a nonlinear saturation curve. For this establishment, temperature distribution in the fin can be expressed by a class of power law. From the optimization analysis, an optimality criterion is setup individually for the fully and partially wet surface conditions. The optimum fin profile and design variables have been determined as a function of thermo-psychrometric parameters. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S014070071000071X

Air-side performance of a parallel-flow parallel-fin (PF2) heat exchanger in sequential frosting / Ping Zhang 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. 1118-1128 Titre : Air-side performance of a parallel-flow parallel-fin (PF2) heat exchanger in sequential frosting Titre original : Performance côté air d'un échangeur de chaleur à écoulement parallèle aux ailettes parallèles sous des conditions de givrage séquentiel Type de document : texte imprimé Auteurs : Ping Zhang, Auteur ; P. S. Hrnjak, Auteur Année de publication : 2010 Article en page(s) : pp. 1118-1128 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Heat  exchanger  Finned  tube  Parallel  flow  Frosting  Defrosting  Heat  transfer  Pressure  drop  Performance Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The thermal-hydraulic performance in periodic frosting conditions is experimentally studied for the parallel-flow parallel-fin heat exchanger, henceforth referred to as a PF2 heat exchanger, a new style of heat exchanger that uses louvered bent fins on flat tubes to enhance water drainage when the flat tubes are horizontal. Typically, it takes a few frosting/defrosting cycles to come to repeatable conditions. The criterion for the initiation of defrost and a sufficiently long defrost period are determined for the test PF2 heat exchanger and test condition. The effects of blower operation on the pressure drop, frost accumulation, water retention, and capacity in time are compared under the conditions of 15 sequential frosting cycles. Pressure drop across the heat exchanger and overall heat transfer coefficient are quantified under frost conditions as functions of the air humidity and air face velocity. The performances of two types of flat-tube heat exchangers, PF2 heat exchanger and conventional parallel-flow serpentine-fin (PFSF) heat exchanger, are compared and the results obtained are presented. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000812 [article] Air-side performance of a parallel-flow parallel-fin (PF2) heat exchanger in sequential frosting = Performance côté air d'un échangeur de chaleur à écoulement parallèle aux ailettes parallèles sous des conditions de givrage séquentiel [texte imprimé] / Ping Zhang, Auteur ; P. S. Hrnjak, Auteur . - 2010 . - pp. 1118-1128. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 6 (Septembre 2010) . - pp. 1118-1128 Mots-clés : Heat  exchanger  Finned  tube  Parallel  flow  Frosting  Defrosting  Heat  transfer  Pressure  drop  Performance Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The thermal-hydraulic performance in periodic frosting conditions is experimentally studied for the parallel-flow parallel-fin heat exchanger, henceforth referred to as a PF2 heat exchanger, a new style of heat exchanger that uses louvered bent fins on flat tubes to enhance water drainage when the flat tubes are horizontal. Typically, it takes a few frosting/defrosting cycles to come to repeatable conditions. The criterion for the initiation of defrost and a sufficiently long defrost period are determined for the test PF2 heat exchanger and test condition. The effects of blower operation on the pressure drop, frost accumulation, water retention, and capacity in time are compared under the conditions of 15 sequential frosting cycles. Pressure drop across the heat exchanger and overall heat transfer coefficient are quantified under frost conditions as functions of the air humidity and air face velocity. The performances of two types of flat-tube heat exchangers, PF2 heat exchanger and conventional parallel-flow serpentine-fin (PFSF) heat exchanger, are compared and the results obtained are presented. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000812

Prediction and reduction of internal blade-passing frequency noise of the centrifugal fan in a refrigerator / Seungyub Lee 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. 1129-1141 Titre : Prediction and reduction of internal blade-passing frequency noise of the centrifugal fan in a refrigerator Titre original : Prévision et diminution du bruit associé á la fréquence des passages des aubes du ventilateur axial d'un réfrigérateur Type de document : texte imprimé Auteurs : Seungyub Lee, Auteur ; Seung Heo, Auteur ; Cheolung Cheong, Auteur Année de publication : 2010 Article en page(s) : pp. 1129-1141 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Domestic  refrigerator  Experiment  Measurement  Noise  Fan  Modelling Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The internal blade-passing frequency (BPF) noise of a centrifugal fan in a household refrigerator is computed using a hybrid method. The unsteady flow field of the centrifugal fan in a duct is predicted by solving the incompressible Reynolds-averaged Navier–Stokes equations with conventional computational fluid dynamics techniques. The principal sources of noise are then extracted from the predicted flow field through the acoustic analogy. Finally, the internal BPF noise is predicted using the modeled sources in combination with the boundary element method. A parametric study using this hybrid technique shows that the BPF noise levels predicted for various non-dimensional cutoff distances closely follow the experimental data. Based on this result, a low-noise design for the centrifugal fan is proposed. A BPF noise reduction of approximately 3 dB is achieved in comparison with the original model, which is in good agreement with the prediction using the hybrid techniques. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000526 [article] Prediction and reduction of internal blade-passing frequency noise of the centrifugal fan in a refrigerator = Prévision et diminution du bruit associé á la fréquence des passages des aubes du ventilateur axial d'un réfrigérateur [texte imprimé] / Seungyub Lee, Auteur ; Seung Heo, Auteur ; Cheolung Cheong, Auteur . - 2010 . - pp. 1129-1141. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 6 (Septembre 2010) . - pp. 1129-1141 Mots-clés : Domestic  refrigerator  Experiment  Measurement  Noise  Fan  Modelling Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The internal blade-passing frequency (BPF) noise of a centrifugal fan in a household refrigerator is computed using a hybrid method. The unsteady flow field of the centrifugal fan in a duct is predicted by solving the incompressible Reynolds-averaged Navier–Stokes equations with conventional computational fluid dynamics techniques. The principal sources of noise are then extracted from the predicted flow field through the acoustic analogy. Finally, the internal BPF noise is predicted using the modeled sources in combination with the boundary element method. A parametric study using this hybrid technique shows that the BPF noise levels predicted for various non-dimensional cutoff distances closely follow the experimental data. Based on this result, a low-noise design for the centrifugal fan is proposed. A BPF noise reduction of approximately 3 dB is achieved in comparison with the original model, which is in good agreement with the prediction using the hybrid techniques. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000526

Investigation of the performance of a high-temperature heat pump using parallel cycles with serial heating on the water side / Kai Wang 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. 1142-1151 Titre : Investigation of the performance of a high-temperature heat pump using parallel cycles with serial heating on the water side Titre original : Etude sur la performance d'une pompe à chaleur à température élevée employant des cycles parallèles avec chauffage en série du côté eau Type de document : texte imprimé Auteurs : Kai Wang, Auteur ; Feng Cao, Auteur ; Shouguo Wang, Auteur Année de publication : 2010 Article en page(s) : pp. 1142-1151 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Heat  pump  Screw  compressor  High  temperature  Design  Oil  injection  Thermodynamic  cycle  Calculation  Performance  Test-measurement Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : High-temperature heat pumps can be widely utilized for industrial heating as an energy-saving method due to their high condensing temperatures. This paper describes a cycle analysis and experimental study on the performance of a high-temperature heat pump (HTHP) system. The performance comparisons are conducted using performance calculations among the parallel cycles with serial heating on the water side, a two-stage compression cycle and a single-stage cycle. The results show that the performance of the heat pump using parallel cycles with serial heating is the best when the condensing temperature exceeds 75 °C. Based on the cycle analysis, a prototype HTHP using parallel cycles with serial heating on the water side with a heating capacity of 700 kW was built in this study. Also, a screw compressor was modified due to the high-temperature conditions. The measured performance shows that the HTHP can stably provide an outlet water temperature of up to 85 °C with a high coefficient of performance (COP). The experimental results indicate that the average heating capacity and coefficient of performance of the HTHP could be improved significantly in high-temperature conditions due to the parallel cycles with serial heating on the water side and the modified compressor. All the results indicate that the HTHP using parallel cycles and modified compressor with serial heating on the water side is very competitive in industrial heating applications. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000861 [article] Investigation of the performance of a high-temperature heat pump using parallel cycles with serial heating on the water side = Etude sur la performance d'une pompe à chaleur à température élevée employant des cycles parallèles avec chauffage en série du côté eau [texte imprimé] / Kai Wang, Auteur ; Feng Cao, Auteur ; Shouguo Wang, Auteur . - 2010 . - pp. 1142-1151. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 6 (Septembre 2010) . - pp. 1142-1151 Mots-clés : Heat  pump  Screw  compressor  High  temperature  Design  Oil  injection  Thermodynamic  cycle  Calculation  Performance  Test-measurement Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : High-temperature heat pumps can be widely utilized for industrial heating as an energy-saving method due to their high condensing temperatures. This paper describes a cycle analysis and experimental study on the performance of a high-temperature heat pump (HTHP) system. The performance comparisons are conducted using performance calculations among the parallel cycles with serial heating on the water side, a two-stage compression cycle and a single-stage cycle. The results show that the performance of the heat pump using parallel cycles with serial heating is the best when the condensing temperature exceeds 75 °C. Based on the cycle analysis, a prototype HTHP using parallel cycles with serial heating on the water side with a heating capacity of 700 kW was built in this study. Also, a screw compressor was modified due to the high-temperature conditions. The measured performance shows that the HTHP can stably provide an outlet water temperature of up to 85 °C with a high coefficient of performance (COP). The experimental results indicate that the average heating capacity and coefficient of performance of the HTHP could be improved significantly in high-temperature conditions due to the parallel cycles with serial heating on the water side and the modified compressor. All the results indicate that the HTHP using parallel cycles and modified compressor with serial heating on the water side is very competitive in industrial heating applications. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000861

Predicting off-design range and performance of refrigeration cycle with two-stage centrifugal compressor and flash intercooler / Teemu Turunen-Saaresti 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. 1152-1160 Titre : Predicting off-design range and performance of refrigeration cycle with two-stage centrifugal compressor and flash intercooler Titre original : Prévision des conditions non prévues dans la conception, et prévision de la performance d'un cycle frigorifique à compresseur centrifuge biétagé muni d'un refroidisseur intermédiaire instantané Type de document : texte imprimé Auteurs : Teemu Turunen-Saaresti, Auteur ; Pekka Röyttä, Auteur ; Juha Honkatukia, Auteur Année de publication : 2010 Article en page(s) : pp. 1152-1160 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Refrigeration  system  Compression  system  Two-stage  system  Centrifugal  compressor  Intercooler  Performance-optimisation Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A modern refrigeration process requires constant control to provide required cooling for the user. To properly and economically accommodate this need, a wide operation range of the compressor is necessary. Therefore, it is of interest to investigate the off-design operation of a cooling cycle and compressor. The refrigeration cycle equipped with a two-stage centrifugal compressor and a flash intercooler is studied. The compressor operation maps are generated with two different design codes and the operation values of the compressors are interpolated from the compressor maps in the simulation of the entire cooling cycle. Based on the previous studies of the utilised refrigeration cycle, R245fa is selected as coolant. The aim of this study is to demonstrate the control capacity of the centrifugal compressor and the performance of the cooling loop in off-design conditions. This configuration provides better and wider control over the cooling range than the traditional on-off control of displacement compressors. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000782 [article] Predicting off-design range and performance of refrigeration cycle with two-stage centrifugal compressor and flash intercooler = Prévision des conditions non prévues dans la conception, et prévision de la performance d'un cycle frigorifique à compresseur centrifuge biétagé muni d'un refroidisseur intermédiaire instantané [texte imprimé] / Teemu Turunen-Saaresti, Auteur ; Pekka Röyttä, Auteur ; Juha Honkatukia, Auteur . - 2010 . - pp. 1152-1160. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 6 (Septembre 2010) . - pp. 1152-1160 Mots-clés : Refrigeration  system  Compression  system  Two-stage  system  Centrifugal  compressor  Intercooler  Performance-optimisation Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A modern refrigeration process requires constant control to provide required cooling for the user. To properly and economically accommodate this need, a wide operation range of the compressor is necessary. Therefore, it is of interest to investigate the off-design operation of a cooling cycle and compressor. The refrigeration cycle equipped with a two-stage centrifugal compressor and a flash intercooler is studied. The compressor operation maps are generated with two different design codes and the operation values of the compressors are interpolated from the compressor maps in the simulation of the entire cooling cycle. Based on the previous studies of the utilised refrigeration cycle, R245fa is selected as coolant. The aim of this study is to demonstrate the control capacity of the centrifugal compressor and the performance of the cooling loop in off-design conditions. This configuration provides better and wider control over the cooling range than the traditional on-off control of displacement compressors. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000782

Comparison of different controllers for variable speed compressor and electronic expansion valve / Orhan Ekren 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. 1161-1168 Titre : Comparison of different controllers for variable speed compressor and electronic expansion valve Titre original : Comparaison de plusieurs régulateurs de la vitesse variable du compresseur et du détendeur électronique Type de document : texte imprimé Auteurs : Orhan Ekren, Auteur ; Savas Sahin, Auteur ; Yalcin Isler, Auteur Année de publication : 2010 Article en page(s) : pp. 1161-1168 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Refrigeration  system  Cooling-scroll  compressor  Electronic  expansion  valve-comparison  Control  Variable  speed  Fuzzy  logic  Neural  network Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This study deals with effects of different control methods on variable speed compressor (VSC) and electronic expansion valve (EEV) in a chiller system. The chiller system has a scroll type VSC and a stepper motor controlled EEV. Two different procedures were applied to control EEV and VSC: controlling each part individually while the other was set to a constant value and controlling both parts together using the same algorithm. Three different control algorithms such as proportional, integral, differential (PID), fuzzy logic and Artificial Neural Network (ANN) were experimented. In the first case, PID controller presented reasonable control solution for more stable SH and Two values in the steady state. In the second case, ANN controller pair was selected to achieve minimum power consumption and more stable SH and Two values against to a disturbance. In this manner, ANN controller showed lower power consumption of 8.1 percent and 6.6 percent than both PID and Fuzzy controllers, respectively. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000915 [article] Comparison of different controllers for variable speed compressor and electronic expansion valve = Comparaison de plusieurs régulateurs de la vitesse variable du compresseur et du détendeur électronique [texte imprimé] / Orhan Ekren, Auteur ; Savas Sahin, Auteur ; Yalcin Isler, Auteur . - 2010 . - pp. 1161-1168. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 6 (Septembre 2010) . - pp. 1161-1168 Mots-clés : Refrigeration  system  Cooling-scroll  compressor  Electronic  expansion  valve-comparison  Control  Variable  speed  Fuzzy  logic  Neural  network Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This study deals with effects of different control methods on variable speed compressor (VSC) and electronic expansion valve (EEV) in a chiller system. The chiller system has a scroll type VSC and a stepper motor controlled EEV. Two different procedures were applied to control EEV and VSC: controlling each part individually while the other was set to a constant value and controlling both parts together using the same algorithm. Three different control algorithms such as proportional, integral, differential (PID), fuzzy logic and Artificial Neural Network (ANN) were experimented. In the first case, PID controller presented reasonable control solution for more stable SH and Two values in the steady state. In the second case, ANN controller pair was selected to achieve minimum power consumption and more stable SH and Two values against to a disturbance. In this manner, ANN controller showed lower power consumption of 8.1 percent and 6.6 percent than both PID and Fuzzy controllers, respectively. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000915

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

Influence of nanoparticles dispersion in POE oils on lubricity and R134a solubility / Sergio Bobbo 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. 1180-1186 Titre : Influence of nanoparticles dispersion in POE oils on lubricity and R134a solubility Titre original : Influence de la dispersion des nanoparticules dans les huiles POE sur la lubricité et la solubilité de R134a Type de document : texte imprimé Auteurs : Sergio Bobbo, Auteur ; Laura Fedele, Auteur ; Monica Fabrizio, Auteur Année de publication : 2010 Article en page(s) : pp. 1180-1186 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Refrigeration  system  Compression  system  R134a  Lubrication  Experiment  Additive  Titanium  dioxide-particle  Polyolester-solubility Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Nanotechnologies offer the opportunity to improve the characteristics of the oil and the oil–refrigerant mixture in refrigeration and air conditioning equipments by dispersing nanoparticles in the oil. Here a study of the influence of the dispersion of single wall carbon nanohorns (SWCNH) and titanium dioxide (TiO2) on the tribological properties of a commercial POE oil is presented, together with the effects on the solubility of R134a at different temperatures. The results obtained showed that the tribological behaviour of the base lubricant here considered can be either improved or worsen, depending on the property (anti-wear or extreme-pressure behaviour), by adding small amount of nanoparticles. On the other hand, nanoparticles dispersion in the base oil did not affect significantly the solubility, suggesting the independence of the thermodynamic properties of the oil from the presence of nanoparticles. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000794 [article] Influence of nanoparticles dispersion in POE oils on lubricity and R134a solubility = Influence de la dispersion des nanoparticules dans les huiles POE sur la lubricité et la solubilité de R134a [texte imprimé] / Sergio Bobbo, Auteur ; Laura Fedele, Auteur ; Monica Fabrizio, Auteur . - 2010 . - pp. 1180-1186. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 6 (Septembre 2010) . - pp. 1180-1186 Mots-clés : Refrigeration  system  Compression  system  R134a  Lubrication  Experiment  Additive  Titanium  dioxide-particle  Polyolester-solubility Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Nanotechnologies offer the opportunity to improve the characteristics of the oil and the oil–refrigerant mixture in refrigeration and air conditioning equipments by dispersing nanoparticles in the oil. Here a study of the influence of the dispersion of single wall carbon nanohorns (SWCNH) and titanium dioxide (TiO2) on the tribological properties of a commercial POE oil is presented, together with the effects on the solubility of R134a at different temperatures. The results obtained showed that the tribological behaviour of the base lubricant here considered can be either improved or worsen, depending on the property (anti-wear or extreme-pressure behaviour), by adding small amount of nanoparticles. On the other hand, nanoparticles dispersion in the base oil did not affect significantly the solubility, suggesting the independence of the thermodynamic properties of the oil from the presence of nanoparticles. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000794

A general approach in evaluating and optimizing thermoelectric coolers / H.Y. Zhang 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. 1187-1196 Titre : A general approach in evaluating and optimizing thermoelectric coolers Titre original : Refroidisseurs thermoélectriques : une approche générale à l'évaluation et l'optimisation Type de document : texte imprimé Auteurs : H.Y. Zhang, Auteur Année de publication : 2010 Article en page(s) : pp. 1187-1196 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Thermoélectricity  Peltier  effect  Calculation  Optimisation  Performance  Analysis Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : In this paper, a general approach in evaluating and optimizing thermoelectric cooler (TEC) performance is presented. Analytical solutions for performance parameters such as cooling capacity and device temperature at both the TEC pellet level and module level are derived in simplified formulation based on the TEC thermal balance equations. The major advantage of the present solutions lies in the fact that the optimal TEC performances can be determined in a straightforward manner, as against the iterative procedure mostly reported in literature. In addition, the module level analysis facilitates the TEC optimization without prior knowledge of pellet details and dimensions. The validity of the present analysis approach is demonstrated by examining TECs of different cooling capacities. Furthermore, the optimization of device temperature for microprocessors under TEC enhanced air cooling and liquid cooling conditions is examined. The effect of hot side to cold side temperature difference is discussed and the thermal resistances at both hot and cold sides are also analyzed within given performance parameters. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000770 [article] A general approach in evaluating and optimizing thermoelectric coolers = Refroidisseurs thermoélectriques : une approche générale à l'évaluation et l'optimisation [texte imprimé] / H.Y. Zhang, Auteur . - 2010 . - pp. 1187-1196. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 6 (Septembre 2010) . - pp. 1187-1196 Mots-clés : Thermoélectricity  Peltier  effect  Calculation  Optimisation  Performance  Analysis Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : In this paper, a general approach in evaluating and optimizing thermoelectric cooler (TEC) performance is presented. Analytical solutions for performance parameters such as cooling capacity and device temperature at both the TEC pellet level and module level are derived in simplified formulation based on the TEC thermal balance equations. The major advantage of the present solutions lies in the fact that the optimal TEC performances can be determined in a straightforward manner, as against the iterative procedure mostly reported in literature. In addition, the module level analysis facilitates the TEC optimization without prior knowledge of pellet details and dimensions. The validity of the present analysis approach is demonstrated by examining TECs of different cooling capacities. Furthermore, the optimization of device temperature for microprocessors under TEC enhanced air cooling and liquid cooling conditions is examined. The effect of hot side to cold side temperature difference is discussed and the thermal resistances at both hot and cold sides are also analyzed within given performance parameters. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000770

Thermoeconomic optimization of a cryogenic refrigeration cycle for re-liquefaction of the LNG boil-off gas / Hoseyn Sayyaadi 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. 1197-1207 Titre : Thermoeconomic optimization of a cryogenic refrigeration cycle for re-liquefaction of the LNG boil-off gas Titre original : Optimisation thermoéconomique d'un cycle frigorifique cryogénique utilisé dans la reliquéfaction du gaz GNL vaporisé Type de document : texte imprimé Auteurs : Hoseyn Sayyaadi, Auteur ; M. Babaelahi, Auteur Année de publication : 2010 Article en page(s) : pp. 1197-1207 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : LNG  Marine  transport  Optimisation  Process  Liquefaction  Vapour  Modelling  Economic  analysis Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The development of the liquefaction process for the Liquefied Natural Gas (LNG) boil-off re-liquefaction plants will be addressed to provide an environmentally friendly and cost effective solution for the gas transportation. In this manner, onboard boil-off gas (BOG) re-liquefaction system as a cryogenic refrigeration cycle is utilized in order to re-liquefy the BOG and returns it to the cargo tanks instead of burning it. In this paper, a thermoeconomic optimization of the LNG-BOG liquefaction system is performed. A thermoeconomic model based on energy and exergy analyses and an economic model according to the total revenue requirement (TRR) are developed. Minimizing of the unit cost of the refrigeration effect as a product of BOG re-liquefaction plant is performed using the genetic algorithm. Results of thermoeconomic optimization are compared with corresponding features of the base case system. Finally, sensitivity of the total cost of the system product with respect to the variation of some operating parameters is studied. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000630 [article] Thermoeconomic optimization of a cryogenic refrigeration cycle for re-liquefaction of the LNG boil-off gas = Optimisation thermoéconomique d'un cycle frigorifique cryogénique utilisé dans la reliquéfaction du gaz GNL vaporisé [texte imprimé] / Hoseyn Sayyaadi, Auteur ; M. Babaelahi, Auteur . - 2010 . - pp. 1197-1207. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 6 (Septembre 2010) . - pp. 1197-1207 Mots-clés : LNG  Marine  transport  Optimisation  Process  Liquefaction  Vapour  Modelling  Economic  analysis Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : The development of the liquefaction process for the Liquefied Natural Gas (LNG) boil-off re-liquefaction plants will be addressed to provide an environmentally friendly and cost effective solution for the gas transportation. In this manner, onboard boil-off gas (BOG) re-liquefaction system as a cryogenic refrigeration cycle is utilized in order to re-liquefy the BOG and returns it to the cargo tanks instead of burning it. In this paper, a thermoeconomic optimization of the LNG-BOG liquefaction system is performed. A thermoeconomic model based on energy and exergy analyses and an economic model according to the total revenue requirement (TRR) are developed. Minimizing of the unit cost of the refrigeration effect as a product of BOG re-liquefaction plant is performed using the genetic algorithm. Results of thermoeconomic optimization are compared with corresponding features of the base case system. Finally, sensitivity of the total cost of the system product with respect to the variation of some operating parameters is studied. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000630

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