Documents disponibles écrits par cet auteur

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) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 7 (Novembre 2013) . - pp. 1982–1997 Titre : Modeling of a novel spool compressor with multiple vapor refrigerant injection ports Titre original : Modélisation d'un compresseur à rotor innovant muni de plusieurs orifices d'injection du frigorigène sous forme de vapeur Type de document : texte imprimé Auteurs : Margaret M. Mathison, Auteur ; James E. Braun, Auteur ; Eckhard A. Groll, Auteur Année de publication : 2014 Article en page(s) : pp. 1982–1997 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Spool  compressor;  Novel  compressor;  Compressor  modeling;  Injection;  Economizing;  Air  conditioning  units Résumé : A model of a novel rotary spool compressor has been developed to explore the effect of multiple injection ports on compressor and cycle performance. The thermodynamic model includes the effects of heat transfer and leakage and is numerically solved to predict the compressor power consumption and mass flow rate. Saturated vapor injection is modeled assuming that the injection pressures and the timing of the injection process can be controlled. The model predicts that adding a single injection port will provide a 12% increase in the cycle coefficient of performance (COP) when the compressor runs at 1907 rpm with R-22 evaporating at −7 °C, condensing at 49 °C, and 15 °C of superheat. Adding a second, non-optimized injection port increases the COP by 16% compared to the cycle without injection. The model is used to investigate the effect of injection pressure, port location, and port diameter on cycle performance. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713000765 [article] Modeling of a novel spool compressor with multiple vapor refrigerant injection ports = Modélisation d'un compresseur à rotor innovant muni de plusieurs orifices d'injection du frigorigène sous forme de vapeur [texte imprimé] / Margaret M. Mathison, Auteur ; James E. Braun, Auteur ; Eckhard A. Groll, Auteur . - 2014 . - pp. 1982–1997. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 7 (Novembre 2013) . - pp. 1982–1997 Mots-clés : Spool  compressor;  Novel  compressor;  Compressor  modeling;  Injection;  Economizing;  Air  conditioning  units Résumé : A model of a novel rotary spool compressor has been developed to explore the effect of multiple injection ports on compressor and cycle performance. The thermodynamic model includes the effects of heat transfer and leakage and is numerically solved to predict the compressor power consumption and mass flow rate. Saturated vapor injection is modeled assuming that the injection pressures and the timing of the injection process can be controlled. The model predicts that adding a single injection port will provide a 12% increase in the cycle coefficient of performance (COP) when the compressor runs at 1907 rpm with R-22 evaporating at −7 °C, condensing at 49 °C, and 15 °C of superheat. Adding a second, non-optimized injection port increases the COP by 16% compared to the cycle without injection. The model is used to investigate the effect of injection pressure, port location, and port diameter on cycle performance. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713000765

Performance limit for economized cycles with continuous refrigerant injection / Margaret M. Mathison 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. 234-242 Titre : Performance limit for economized cycles with continuous refrigerant injection Titre original : Limites de la performance des cycles à économiseur avec injection continue de frigorigène Type de document : texte imprimé Auteurs : Margaret M. Mathison, Auteur ; James E. Braun, Auteur ; Eckhard A. Groll, Auteur Année de publication : 2011 Article en page(s) : pp. 234-242 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : System  Multistage  Modelling  Injection  Energy  saving  Cycle-thermodynamic Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : While economizing can improve the performance of vapor compression cycles, the cost of multi-stage compressors has limited its implementation to large-scale applications. However, the development of compressors with injection ports presents new opportunities for economizing in smaller-scale applications. In addition to eliminating the need for a costly multi-stage compressor, multiple injection ports can be added at relatively low cost to further improve cycle performance. In the current study, a model was developed to study the effect of the number of injection ports on performance and determine the limit to performance with injection. The model predicts that continuous injection, in which economized refrigerant is injected at an infinite number of ports to maintain saturated vapor in the compressor, provides very significant performance improvements for air-conditioning and refrigeration applications. At standard operating conditions, the COP increases between 18% and 51% depending on the application, with higher temperature lift cycles benefiting most significantly. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002112 [article] Performance limit for economized cycles with continuous refrigerant injection = Limites de la performance des cycles à économiseur avec injection continue de frigorigène [texte imprimé] / Margaret M. Mathison, Auteur ; James E. Braun, Auteur ; Eckhard A. Groll, Auteur . - 2011 . - pp. 234-242. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 1 (Janvier 2011) . - pp. 234-242 Mots-clés : System  Multistage  Modelling  Injection  Energy  saving  Cycle-thermodynamic Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : While economizing can improve the performance of vapor compression cycles, the cost of multi-stage compressors has limited its implementation to large-scale applications. However, the development of compressors with injection ports presents new opportunities for economizing in smaller-scale applications. In addition to eliminating the need for a costly multi-stage compressor, multiple injection ports can be added at relatively low cost to further improve cycle performance. In the current study, a model was developed to study the effect of the number of injection ports on performance and determine the limit to performance with injection. The model predicts that continuous injection, in which economized refrigerant is injected at an infinite number of ports to maintain saturated vapor in the compressor, provides very significant performance improvements for air-conditioning and refrigeration applications. At standard operating conditions, the COP increases between 18% and 51% depending on the application, with higher temperature lift cycles benefiting most significantly. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710002112