Documents disponibles écrits par cet auteur

Experimental and numerical study of electronic module-cooling heat sinks used in a variable frequency air-conditioner outdoor unit / Xifeng Zhao in International journal of refrigeration, Vol. 38 (Février 2014) 

Public ISBD [article]  in International journal of refrigeration > Vol. 38 (Février 2014) . - pp. 10–21 Titre : Experimental and numerical study of electronic module-cooling heat sinks used in a variable frequency air-conditioner outdoor unit Titre original : Etude expérimentale et numérique de puits thermiques d'un système extérieur de conditionnement d'air à vitesse variable, utilisés pour le refroidissement de modules électroniques Type de document : texte imprimé Auteurs : Xifeng Zhao, Auteur ; Jinju Sun, Auteur ; Chao Wang, Auteur Année de publication : 2014 Article en page(s) : pp. 10–21 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Heat  sink;  Electronic  module  cooling;  Variable  frequency  air-conditioner;  Heat  transfer Résumé : In variable-frequency Air Conditioner (AC), sizes of frequency controlling electronic module and its supplemental heat sink are much restrained and they are also tightly packed. Heat removal in such a limited space is difficult, and effective and compact heat sinks are required. The study has focused on heat sink thermal performance with different geometries and configurations. To allow for interaction of heat sink and fan, both numerical and experimental investigations are conducted in a real AC outdoor unit environment. An increase in heat sink base area significantly improves its thermal performance; fin height and pitch influence convective surface and also sweeping stream behavior and a good compromise is needed to enhance convective heat transfer. A proper tuning of heat sink configuration is effective to improve convective stream and subsequently enhance thermal performance. Heat sink geometry and configuration produces insignificant influence on fan aerodynamic and aeroacoustic performance, and AC system performance. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713002533 [article] Experimental and numerical study of electronic module-cooling heat sinks used in a variable frequency air-conditioner outdoor unit = Etude expérimentale et numérique de puits thermiques d'un système extérieur de conditionnement d'air à vitesse variable, utilisés pour le refroidissement de modules électroniques [texte imprimé] / Xifeng Zhao, Auteur ; Jinju Sun, Auteur ; Chao Wang, Auteur . - 2014 . - pp. 10–21. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 38 (Février 2014) . - pp. 10–21 Mots-clés : Heat  sink;  Electronic  module  cooling;  Variable  frequency  air-conditioner;  Heat  transfer Résumé : In variable-frequency Air Conditioner (AC), sizes of frequency controlling electronic module and its supplemental heat sink are much restrained and they are also tightly packed. Heat removal in such a limited space is difficult, and effective and compact heat sinks are required. The study has focused on heat sink thermal performance with different geometries and configurations. To allow for interaction of heat sink and fan, both numerical and experimental investigations are conducted in a real AC outdoor unit environment. An increase in heat sink base area significantly improves its thermal performance; fin height and pitch influence convective surface and also sweeping stream behavior and a good compromise is needed to enhance convective heat transfer. A proper tuning of heat sink configuration is effective to improve convective stream and subsequently enhance thermal performance. Heat sink geometry and configuration produces insignificant influence on fan aerodynamic and aeroacoustic performance, and AC system performance. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713002533

Prediction and measurement of axial flow fan aerodynamic and aeroacoustic performance in a split-type air-conditioner outdoor unit / Xifeng Zhao in International journal of refrigeration, Vol. 36 N° 3 (Mai 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 1098–1108 Titre : Prediction and measurement of axial flow fan aerodynamic and aeroacoustic performance in a split-type air-conditioner outdoor unit Titre original : Prévisions et mesures de la performance aérodynamique et aéroacoustique du ventilateur axial d'un système extérieur de conditionnement d'air de type split Type de document : texte imprimé Auteurs : Xifeng Zhao, Auteur ; Jinju Sun, Auteur ; Zhi Zhang, Auteur Année de publication : 2013 Article en page(s) : pp. 1098–1108 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Air  conditioner;  Outdoor  unit;  Axial  flow  fan;  Computational  fluid  dynamics;  Computational  aerodynamic  acoustics;  Noise  reduction Résumé : The study has focused on outdoor unit noise reduction by fan geometry modification with the refined numerical and experimental approaches. The outlet louver, electric motor and its support are included to refine the flow and acoustic model and a hybrid method incorporating CFD and CAA is used to predict the noise behavior. The fan performance curve is well-predicted; the moderate acoustic power is obtained on the outlet louver, motor support and motor exhibiting a significant contribution to overall noise behavior. The aeroacoustic test is conducted in an anechoic chamber and the obtained results are compared with the semi-anechoic chamber ones, and the unremarkable differences are produced, which indicate the ground floor being of some influence. Both modified fan geometries are effective to reduce the noise but the flanging outer-edge blade is more effective. The noise directivities of three geometry fans are investigated both numerically and experimentally and the produced asymmetric characteristics are analyzed. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003325 [article] Prediction and measurement of axial flow fan aerodynamic and aeroacoustic performance in a split-type air-conditioner outdoor unit = Prévisions et mesures de la performance aérodynamique et aéroacoustique du ventilateur axial d'un système extérieur de conditionnement d'air de type split [texte imprimé] / Xifeng Zhao, Auteur ; Jinju Sun, Auteur ; Zhi Zhang, Auteur . - 2013 . - pp. 1098–1108. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 1098–1108 Mots-clés : Air  conditioner;  Outdoor  unit;  Axial  flow  fan;  Computational  fluid  dynamics;  Computational  aerodynamic  acoustics;  Noise  reduction Résumé : The study has focused on outdoor unit noise reduction by fan geometry modification with the refined numerical and experimental approaches. The outlet louver, electric motor and its support are included to refine the flow and acoustic model and a hybrid method incorporating CFD and CAA is used to predict the noise behavior. The fan performance curve is well-predicted; the moderate acoustic power is obtained on the outlet louver, motor support and motor exhibiting a significant contribution to overall noise behavior. The aeroacoustic test is conducted in an anechoic chamber and the obtained results are compared with the semi-anechoic chamber ones, and the unremarkable differences are produced, which indicate the ground floor being of some influence. Both modified fan geometries are effective to reduce the noise but the flanging outer-edge blade is more effective. The noise directivities of three geometry fans are investigated both numerically and experimentally and the produced asymmetric characteristics are analyzed. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003325