Experimental study on flooding and flow reversal in small diameter tubes with various inclinations and horizontal lengths / Tiandong Guo in International journal of refrigeration, Vol. 38 (Février 2014)  

Public ISBD [article]  inInternational journal of refrigeration > Vol. 38 (Février 2014) . - pp. 290–298 Titre : Experimental study on flooding and flow reversal in small diameter tubes with various inclinations and horizontal lengths Titre original : Etude expérimentale sur le noyage et l'inversion de l'écoulement dans des tubes de faible diamètre avec différentes inclinaisons et longueurs horizontales Type de document : texte imprimé Auteurs : Tiandong Guo, Auteur ; Ji Hwan Jeong, Auteur Année de publication : 2014 Article en page(s) : pp. 290–298 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Flooding  Flow reversal  Counter-current flow  Suction pipe  Refrigerator Résumé : Lubricant oil return to compressor in household refrigerator is controlled by oil-refrigerant two-phase flow behavior in the suction pipe. Conditions of flooding and flow reversal were considered as a conservative bound for the oil return. Phenomena associated with counter current flow limitation (CCFL or flooding) and flow reversal were experimentally investigated using small diameter tubes with vertical, inclined and crank-type configurations. Flooding and flow reversal phenomena were visually observed. Both flooding and flow reversal points were measured using various shapes of test section in a wide range of liquid flow rate. The gas velocities for flooding were found to be inversely proportional to the liquid flow rates and independent of the tube configurations. The gas velocities for the flow reversal point appeared to be at a similar level over a certain range of liquid flow rate but strongly depend on the inclination angle, horizontal length and kind of liquid. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713002247 [article] Experimental study on flooding and flow reversal in small diameter tubes with various inclinations and horizontal lengths = Etude expérimentale sur le noyage et l'inversion de l'écoulement dans des tubes de faible diamètre avec différentes inclinaisons et longueurs horizontales [texte imprimé] / Tiandong Guo, Auteur ; Ji Hwan Jeong, Auteur . - 2014 . - pp. 290–298. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 38 (Février 2014) . - pp. 290–298 Mots-clés : Flooding  Flow reversal  Counter-current flow  Suction pipe  Refrigerator Résumé : Lubricant oil return to compressor in household refrigerator is controlled by oil-refrigerant two-phase flow behavior in the suction pipe. Conditions of flooding and flow reversal were considered as a conservative bound for the oil return. Phenomena associated with counter current flow limitation (CCFL or flooding) and flow reversal were experimentally investigated using small diameter tubes with vertical, inclined and crank-type configurations. Flooding and flow reversal phenomena were visually observed. Both flooding and flow reversal points were measured using various shapes of test section in a wide range of liquid flow rate. The gas velocities for flooding were found to be inversely proportional to the liquid flow rates and independent of the tube configurations. The gas velocities for the flow reversal point appeared to be at a similar level over a certain range of liquid flow rate but strongly depend on the inclination angle, horizontal length and kind of liquid. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713002247

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Performance characteristics of a capacity-modulated linear compressor for home refrigerators / Jong Kwon Kim in International journal of refrigeration, Vol. 36 N° 3 (Mai 2013)  

Public ISBD [article]  inInternational journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 776–785 Titre : Performance characteristics of a capacity-modulated linear compressor for home refrigerators Titre original : Caractéristiques de la performance d'un compresseur linéaire à modulation de puissance pour les réfrigérateurs domestiques Type de document : texte imprimé Auteurs : Jong Kwon Kim, Auteur ; Ji Hwan Jeong, Auteur Année de publication : 2013 Article en page(s) : pp. 776–785 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Linear compressor  Free piston  Household refrigerator  Inherent capacity modulation  Refrigerating system Résumé : A linear compressor requires stroke controllers, as the piston movement is sensitive to the ambient temperature. This paper presents the performance characteristics of an inherent capacity-modulated (ICM) linear compressor. The compressor is capable of modulating its capacity independently without requiring stroke controllers. Electric parameters are designed to deliver inherent capacity modulation in accordance with variations in the cooling demand. An inherent capacity modulation method according to cooling demand levels was proposed and a prototype compressor was constructed. Its performance was evaluated with the cooling capacity ratio varying from 50 to 100% at an evaporating temperature of −26 °C and a condensing temperature of 38 °C. The total efficiency of the ICM linear compressor was as high as that of an electrical resonant system. This shows that the COP difference between the ICM linear compressor and the linear compressor controlled by an electrical resonance system appeared to be less than 1% over a wide cooling capacity ratio range of 50–100%. The results for the conventional linear compressor did not account for the power consumed by the electronic drive, so thus the ICM linear compressor had the potential improvement for energy saving. En ligne : http://www.sciencedirect.com/science/article/pii/S014070071200343X [article] Performance characteristics of a capacity-modulated linear compressor for home refrigerators = Caractéristiques de la performance d'un compresseur linéaire à modulation de puissance pour les réfrigérateurs domestiques [texte imprimé] / Jong Kwon Kim, Auteur ; Ji Hwan Jeong, Auteur . - 2013 . - pp. 776–785. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 776–785 Mots-clés : Linear compressor  Free piston  Household refrigerator  Inherent capacity modulation  Refrigerating system Résumé : A linear compressor requires stroke controllers, as the piston movement is sensitive to the ambient temperature. This paper presents the performance characteristics of an inherent capacity-modulated (ICM) linear compressor. The compressor is capable of modulating its capacity independently without requiring stroke controllers. Electric parameters are designed to deliver inherent capacity modulation in accordance with variations in the cooling demand. An inherent capacity modulation method according to cooling demand levels was proposed and a prototype compressor was constructed. Its performance was evaluated with the cooling capacity ratio varying from 50 to 100% at an evaporating temperature of −26 °C and a condensing temperature of 38 °C. The total efficiency of the ICM linear compressor was as high as that of an electrical resonant system. This shows that the COP difference between the ICM linear compressor and the linear compressor controlled by an electrical resonance system appeared to be less than 1% over a wide cooling capacity ratio range of 50–100%. The results for the conventional linear compressor did not account for the power consumed by the electronic drive, so thus the ICM linear compressor had the potential improvement for energy saving. En ligne : http://www.sciencedirect.com/science/article/pii/S014070071200343X

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