Documents disponibles écrits par cet auteur

Theoretical and experimental investigation on the performance of screw refrigeration compressor under part-load conditions / Wenqing Chen in International journal of refrigeration, Vol. 34 N° 4 (Juin 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 4 (Juin 2011) . - pp. 1141-1150 Titre : Theoretical and experimental investigation on the performance of screw refrigeration compressor under part-load conditions Titre original : Etude théorique et expérimentale sur la performance des compresseurs à vis sous des conditions de charge partielle Type de document : texte imprimé Auteurs : Wenqing Chen, Auteur ; Ziwen Xing, Auteur ; Hao Tang, Auteur Année de publication : 2011 Article en page(s) : pp. 1141-1150 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Refrigeration  system  Screw  compressor  Modelling  Experimentation  Performance Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Slide valve is normally employed in screw refrigeration compressor to meet the cooling capacity demanded by the load variation. A mathematical model describing the working process of screw refrigeration compressor with a slide valve assembly under part-load conditions is established based on the calculation of the effective by-pass area and radial discharge area. Experimental investigation on a screw refrigeration compressor under part-load conditions with several evaporation and condensation temperatures is also carried out. Simulation results are in good agreement with the experimental ones. With the validated model, effects of key design parameters, i.e. the installation angles of the slide valve relative to the cylinder and the slide stop length, on the working process and performance of screw refrigeration compressor have been analyzed. These results can be useful for optimum design of the slide valve assembly to improve the energy efficiency of refrigeration system with screw compressor under part-load conditions. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000351 [article] Theoretical and experimental investigation on the performance of screw refrigeration compressor under part-load conditions = Etude théorique et expérimentale sur la performance des compresseurs à vis sous des conditions de charge partielle [texte imprimé] / Wenqing Chen, Auteur ; Ziwen Xing, Auteur ; Hao Tang, Auteur . - 2011 . - pp. 1141-1150. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 4 (Juin 2011) . - pp. 1141-1150 Mots-clés : Refrigeration  system  Screw  compressor  Modelling  Experimentation  Performance Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Slide valve is normally employed in screw refrigeration compressor to meet the cooling capacity demanded by the load variation. A mathematical model describing the working process of screw refrigeration compressor with a slide valve assembly under part-load conditions is established based on the calculation of the effective by-pass area and radial discharge area. Experimental investigation on a screw refrigeration compressor under part-load conditions with several evaporation and condensation temperatures is also carried out. Simulation results are in good agreement with the experimental ones. With the validated model, effects of key design parameters, i.e. the installation angles of the slide valve relative to the cylinder and the slide stop length, on the working process and performance of screw refrigeration compressor have been analyzed. These results can be useful for optimum design of the slide valve assembly to improve the energy efficiency of refrigeration system with screw compressor under part-load conditions. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000351

Thermal modeling for the motor in semi-hermetic screw refrigeration compressors under part-load conditions / Wenqing Chen 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. 1874–1882 Titre : Thermal modeling for the motor in semi-hermetic screw refrigeration compressors under part-load conditions Titre original : Modélisation thermique du moteur d'un compresseur frigorifique à vis semi-hermétique sous conditions de charge partielle Type de document : texte imprimé Auteurs : Wenqing Chen, Auteur ; Ziwen Xing, Auteur ; Jiubing Shen, Auteur Année de publication : 2014 Article en page(s) : pp. 1874–1882 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Semi-hermetic  compressor;  Motor;  Thermal  analysis;  Part-load Résumé : In the semi-hermetic screw refrigeration compressor, the motor is mostly cooled down by suction refrigerant before it flows into the compressor suction port. To investigate cooling effects of the motor and performance of the compressor under part-load conditions, a lumped parameter model describing heat-transfer characteristics inside the motor and a part-load model of screw refrigeration compressor are developed and validated. Heating effects at compressor suction end and heat conduction from the male rotor screw to the motor shaft are taken into account. Nodes representing refrigerant inside the motor cooling passages are modeled separately. Temperature rise of refrigerant through the motor increases when the compressor load drops by either suction volume variation or speed variation. With drop of the compressor load, stator winding temperature goes up in the case of suction volume variation by slide valve motion, but it lows in the case of speed variation by frequency conversion. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001746 [article] Thermal modeling for the motor in semi-hermetic screw refrigeration compressors under part-load conditions = Modélisation thermique du moteur d'un compresseur frigorifique à vis semi-hermétique sous conditions de charge partielle [texte imprimé] / Wenqing Chen, Auteur ; Ziwen Xing, Auteur ; Jiubing Shen, Auteur . - 2014 . - pp. 1874–1882. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 7 (Novembre 2013) . - pp. 1874–1882 Mots-clés : Semi-hermetic  compressor;  Motor;  Thermal  analysis;  Part-load Résumé : In the semi-hermetic screw refrigeration compressor, the motor is mostly cooled down by suction refrigerant before it flows into the compressor suction port. To investigate cooling effects of the motor and performance of the compressor under part-load conditions, a lumped parameter model describing heat-transfer characteristics inside the motor and a part-load model of screw refrigeration compressor are developed and validated. Heating effects at compressor suction end and heat conduction from the male rotor screw to the motor shaft are taken into account. Nodes representing refrigerant inside the motor cooling passages are modeled separately. Temperature rise of refrigerant through the motor increases when the compressor load drops by either suction volume variation or speed variation. With drop of the compressor load, stator winding temperature goes up in the case of suction volume variation by slide valve motion, but it lows in the case of speed variation by frequency conversion. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713001746