Documents disponibles écrits par cet auteur

A comprehensive model of a miniature-scale linear compressor for electronics cooling / Craig R. Bradshaw 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. 63-73 Titre : A comprehensive model of a miniature-scale linear compressor for electronics cooling Titre original : Modèle extensif d'un compresseur linéaire miniaturisé utilisé pour refroidir les composants des systèmes électroniques Type de document : texte imprimé Auteurs : Craig R. Bradshaw, Auteur ; Eckhard A. Groll, Auteur ; Suresh V. Garimella, Auteur Année de publication : 2011 Article en page(s) : pp. 63-73 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Linear  compressor  Compressor  model  Electronic  components  Cooling  Miniature-compressor Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A comprehensive model of a miniature-scale linear compressor for electronics cooling is presented. Linear compressors are appealing for refrigeration applications in electronics cooling. A small number of moving components translate to less theoretical frictional losses and the possibility that this technology could scale to smaller physical sizes better than conventional compressors. The model developed here incorporates all of the major components of the linear compressor including dynamics associated with the piston motion. The results of the compressor model were validated using experimental data from a prototype linear compressor. The prototype compressor has an overall displacement of approximately 3 cm3, an average stroke of 0.6 cm. The prototype compressor was custom built for this work and utilizes custom parts with the exception of the mechanical springs and the linear motor. The model results showed good agreement when validated against the experimental results. The piston stroke is predicted within 1.3% MAE. The volumetric and overall isentropic efficiencies are predicted within 24% and 31%, MAE respectively. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002240 [article] A comprehensive model of a miniature-scale linear compressor for electronics cooling = Modèle extensif d'un compresseur linéaire miniaturisé utilisé pour refroidir les composants des systèmes électroniques [texte imprimé] / Craig R. Bradshaw, Auteur ; Eckhard A. Groll, Auteur ; Suresh V. Garimella, Auteur . - 2011 . - pp. 63-73. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 1 (Janvier 2011) . - pp. 63-73 Mots-clés : Linear  compressor  Compressor  model  Electronic  components  Cooling  Miniature-compressor Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A comprehensive model of a miniature-scale linear compressor for electronics cooling is presented. Linear compressors are appealing for refrigeration applications in electronics cooling. A small number of moving components translate to less theoretical frictional losses and the possibility that this technology could scale to smaller physical sizes better than conventional compressors. The model developed here incorporates all of the major components of the linear compressor including dynamics associated with the piston motion. The results of the compressor model were validated using experimental data from a prototype linear compressor. The prototype compressor has an overall displacement of approximately 3 cm3, an average stroke of 0.6 cm. The prototype compressor was custom built for this work and utilizes custom parts with the exception of the mechanical springs and the linear motor. The model results showed good agreement when validated against the experimental results. The piston stroke is predicted within 1.3% MAE. The volumetric and overall isentropic efficiencies are predicted within 24% and 31%, MAE respectively. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002240

A comprehensive model of a novel rotating spool compressor / Craig R. Bradshaw in International journal of refrigeration, Vol. 36 N° 7 (Novembre 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 7 (Novembre 2013) . - pp. 1974–1981 Titre : A comprehensive model of a novel rotating spool compressor Titre original : Modèle complet de compresseur innovant à bobine rotative Type de document : texte imprimé Auteurs : Craig R. Bradshaw, Auteur ; Eckhard A. Groll, Auteur Année de publication : 2014 Article en page(s) : pp. 1974–1981 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Spool  compressor;  Comprehensive  model;  Novel  compressor;  Geometry  model Résumé : A comprehensive simulation model of a novel rotating spool compressor is presented. The spool compressor provides a new rotary compression mechanism with easily manufactured components. A detailed analytical geometry model of the spool compressor is presented, which includes the geometry of the vane. This geometry model is included in an overall comprehensive compressor model that includes sub-models for friction, leakage, and heat transfer. The results of the comprehensive model were validated using experimental data from a prototype compressor. The prototype compressor has an overall displacement of 23.9 cm3, and was operated using R410A as the working fluid. The model predicts the volumetric efficiency, discharge temperature, and shaft power of the prototype compressor to within 3.13% MAE, 16.5 K and −13.2 W average deviation, respectively. The trends and spread in the data indicate that additional effort should be focused on the operation of the active sealing elements within the compressor. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001680 [article] A comprehensive model of a novel rotating spool compressor = Modèle complet de compresseur innovant à bobine rotative [texte imprimé] / Craig R. Bradshaw, Auteur ; Eckhard A. Groll, Auteur . - 2014 . - pp. 1974–1981. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 7 (Novembre 2013) . - pp. 1974–1981 Mots-clés : Spool  compressor;  Comprehensive  model;  Novel  compressor;  Geometry  model Résumé : A comprehensive simulation model of a novel rotating spool compressor is presented. The spool compressor provides a new rotary compression mechanism with easily manufactured components. A detailed analytical geometry model of the spool compressor is presented, which includes the geometry of the vane. This geometry model is included in an overall comprehensive compressor model that includes sub-models for friction, leakage, and heat transfer. The results of the comprehensive model were validated using experimental data from a prototype compressor. The prototype compressor has an overall displacement of 23.9 cm3, and was operated using R410A as the working fluid. The model predicts the volumetric efficiency, discharge temperature, and shaft power of the prototype compressor to within 3.13% MAE, 16.5 K and −13.2 W average deviation, respectively. The trends and spread in the data indicate that additional effort should be focused on the operation of the active sealing elements within the compressor. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001680

A computationally efficient hybrid leakage model for positive displacement compressors and expanders / Ian H. Bell in International journal of refrigeration, Vol. 36 N° 7 (Novembre 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 7 (Novembre 2013) . - pp. 1965–1973 Titre : A computationally efficient hybrid leakage model for positive displacement compressors and expanders Titre original : Modèle hybride des fuites fiable sur le plan des calculs, pour les compresseurs volumétriques et les détendeurs Type de document : texte imprimé Auteurs : Ian H. Bell, Auteur ; Eckhard A. Groll, Auteur ; James E. Braun, Auteur Année de publication : 2014 Article en page(s) : pp. 1965–1973 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Compressor;  Expanders;  Simulation;  Leakage Résumé : An empirical frictional correction factor to the isentropic nozzle model has been developed for application to refrigerant leakage modeling in scroll, rotary and other similar compressors and expanders. This correction factor is derived by calculating the leakage mass flow rate with a compressible, variable area, real gas properties model and referencing the results to an isentropic nozzle model. The ratio of flows is correlated to the Reynolds number, a characteristic length and the leakage gap width. A representative selection of fluids and geometries are employed. For all the correlations, at least 93% of the points are predicted within an absolute error band of 20%. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713000200 [article] A computationally efficient hybrid leakage model for positive displacement compressors and expanders = Modèle hybride des fuites fiable sur le plan des calculs, pour les compresseurs volumétriques et les détendeurs [texte imprimé] / Ian H. Bell, Auteur ; Eckhard A. Groll, Auteur ; James E. Braun, Auteur . - 2014 . - pp. 1965–1973. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 7 (Novembre 2013) . - pp. 1965–1973 Mots-clés : Compressor;  Expanders;  Simulation;  Leakage Résumé : An empirical frictional correction factor to the isentropic nozzle model has been developed for application to refrigerant leakage modeling in scroll, rotary and other similar compressors and expanders. This correction factor is derived by calculating the leakage mass flow rate with a compressible, variable area, real gas properties model and referencing the results to an isentropic nozzle model. The ratio of flows is correlated to the Reynolds number, a characteristic length and the leakage gap width. A representative selection of fluids and geometries are employed. For all the correlations, at least 93% of the points are predicted within an absolute error band of 20%. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713000200

Dynamic analysis of an electrostatic compressor / Abhijit A. Sathe in International journal of refrigeration, Vol. 33 N° 5 (Août 2010) 

Public ISBD [article]  in International journal of refrigeration > Vol. 33 N° 5 (Août 2010) . - pp. 889-896 Titre : Dynamic analysis of an electrostatic compressor Titre original : Analyse dynamique d'un compresseur électrostatique Type de document : texte imprimé Auteurs : Abhijit A. Sathe, Auteur ; Eckhard A. Groll, Auteur ; Suresh V. Garimella, Auteur Année de publication : 2010 Article en page(s) : pp. 889-896 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Diaphragm  compressor  Refrigeration  Modelling  Simulation  Mechanical  property Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper presents an analytical approach for modeling the transient dynamic forces in a diaphragm compressor which operates under the action of an electrostatically actuated diaphragm. An experimentally validated, quasi-static model for a diaphragm compressor for electronics cooling was previously developed in which dynamic effects were neglected. In the new model, the dynamic forces induced due to the finite time necessary for deflection of the diaphragm are taken into consideration using the segmentation approach developed earlier. Results from the analytical model compare favorably with those from a detailed numerical simulation as well as with experimental measurements available in the literature. The analytical dynamic model is applied to two different pumping devices to illustrate the effects of the dynamic forces on the overall performance of the device. The effect of pumping frequency of the device on the operating voltage is also explored. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000745 [article] Dynamic analysis of an electrostatic compressor = Analyse dynamique d'un compresseur électrostatique [texte imprimé] / Abhijit A. Sathe, Auteur ; Eckhard A. Groll, Auteur ; Suresh V. Garimella, Auteur . - 2010 . - pp. 889-896. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 5 (Août 2010) . - pp. 889-896 Mots-clés : Diaphragm  compressor  Refrigeration  Modelling  Simulation  Mechanical  property Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper presents an analytical approach for modeling the transient dynamic forces in a diaphragm compressor which operates under the action of an electrostatically actuated diaphragm. An experimentally validated, quasi-static model for a diaphragm compressor for electronics cooling was previously developed in which dynamic effects were neglected. In the new model, the dynamic forces induced due to the finite time necessary for deflection of the diaphragm are taken into consideration using the segmentation approach developed earlier. Results from the analytical model compare favorably with those from a detailed numerical simulation as well as with experimental measurements available in the literature. The analytical dynamic model is applied to two different pumping devices to illustrate the effects of the dynamic forces on the overall performance of the device. The effect of pumping frequency of the device on the operating voltage is also explored. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000745

Experimental testing of an oil-flooded hermetic scroll compressor / Ian H. Bell in International journal of refrigeration, Vol. 36 N° 7 (Novembre 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 7 (Novembre 2013) . - pp. 1866–1873 Titre : Experimental testing of an oil-flooded hermetic scroll compressor Titre original : Essais expérimentaux effectués sur un compresseur à spirale hermétique noyé par l'huile Type de document : texte imprimé Auteurs : Ian H. Bell, Auteur ; Eckhard A. Groll, Auteur ; James E. Braun, Auteur Année de publication : 2014 Article en page(s) : pp. 1866–1873 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Air  conditioning;  Refrigeration;  Flooded  compression Résumé : In this work, a residential air conditioning compressor designed for vapor injection has been modified in order to inject large quantities of oil into the working chamber in order to approach an isothermal compression process. The compressor was tested with oil injection mass flow fractions of up to 45%. At an evaporating temperature of −10 °C and condensing temperature of 30 °C, the overall isentropic efficiency was up to 70% at the highest oil injection rate. Overall, over the testing envelope investigated, there are no significantly negative effects experienced for the compressor and the compressor isentropic efficiency and refrigerant mass flow rate improve monotonically as the oil injection rate is increased. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713000212 [article] Experimental testing of an oil-flooded hermetic scroll compressor = Essais expérimentaux effectués sur un compresseur à spirale hermétique noyé par l'huile [texte imprimé] / Ian H. Bell, Auteur ; Eckhard A. Groll, Auteur ; James E. Braun, Auteur . - 2014 . - pp. 1866–1873. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 7 (Novembre 2013) . - pp. 1866–1873 Mots-clés : Air  conditioning;  Refrigeration;  Flooded  compression Résumé : In this work, a residential air conditioning compressor designed for vapor injection has been modified in order to inject large quantities of oil into the working chamber in order to approach an isothermal compression process. The compressor was tested with oil injection mass flow fractions of up to 45%. At an evaporating temperature of −10 °C and condensing temperature of 30 °C, the overall isentropic efficiency was up to 70% at the highest oil injection rate. Overall, over the testing envelope investigated, there are no significantly negative effects experienced for the compressor and the compressor isentropic efficiency and refrigerant mass flow rate improve monotonically as the oil injection rate is increased. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713000212

Linear compressors for electronics cooling / Craig R. Bradshaw in International journal of refrigeration, Vol. 36 N° 7 (Novembre 2013) 

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Modeling of a novel spool compressor with multiple vapor refrigerant injection ports / Margaret M. Mathison in International journal of refrigeration, Vol. 36 N° 7 (Novembre 2013) 

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Modeling of a semi-hermetic CO2 reciprocating compressor including lubrication submodels for piston rings and bearings / Bin Yang in International journal of refrigeration, Vol. 36 N° 7 (Novembre 2013) 

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Performance limit for economized cycles with continuous refrigerant injection / Margaret M. Mathison in International journal of refrigeration, Vol. 34 N° 1 (Janvier 2011) 

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Performance of vapor compression systems with compressor oil flooding and regeneration / Ian H. Bell in International journal of refrigeration, Vol. 34 N° 1 (Janvier 2011) 

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Sensitivity analysis of a comprehensive model for a miniature-scale linear compressor for electronics cooling / Craig R. Bradshaw in International journal of refrigeration, Vol. 36 N° 7 (Novembre 2013) 

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Variable wall thickness scroll geometry modeling with use of a control volume approach / Bryce R. Shaffer in International journal of refrigeration, Vol. 36 N° 7 (Novembre 2013) 

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