Documents disponibles écrits par cet auteur

Experimental study on ammonia-water falling film absorption in external magnetic fields / Xiao Feng Niu in International journal of refrigeration, Vol. 33 N° 4 (Juin 2010) 

Public ISBD [article]  in International journal of refrigeration > Vol. 33 N° 4 (Juin 2010) . - pp. 686-694 Titre : Experimental study on ammonia-water falling film absorption in external magnetic fields Titre original : Etude éxperimentale sur l’absorption d’un film tombant à ammoniac/eau dans les champs magnétiques externes Type de document : texte imprimé Auteurs : Xiao Feng Niu, Auteur ; Kai Du, Auteur ; Fu Xiao, Auteur Année de publication : 2010 Article en page(s) : pp. 686-694 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Absorption  system  Ammonia-water  Experiment  Falling  film  Absorber  Magnetic  field Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Experiments of ammonia–water falling film absorption were performed in magnetic fields of different intensities and different directions as well as under varied operating conditions. Experimental results showed that the outlet concentration of ammonia–water, the outlet temperature of cooling water and the amount of absorption heat and mass in downward magnetic field are higher than those in non-magnetic field. However, all of them decreased in the upward magnetic field. Therefore, it can be concluded that the magnetic field with the same direction as falling film enhances the absorption, and the magnetic field with the direction against falling film weakens the absorption of ammonia–water. The results also showed the effect of magnetic field on absorption was more obvious in solutions with low inlet concentration. The influences of the cooling water flow rate, the cooling water inlet temperature and the solution flow rate on absorption in magnetic field were similar to those without magnetic field. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000204 [article] Experimental study on ammonia-water falling film absorption in external magnetic fields = Etude éxperimentale sur l’absorption d’un film tombant à ammoniac/eau dans les champs magnétiques externes [texte imprimé] / Xiao Feng Niu, Auteur ; Kai Du, Auteur ; Fu Xiao, Auteur . - 2010 . - pp. 686-694. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 4 (Juin 2010) . - pp. 686-694 Mots-clés : Absorption  system  Ammonia-water  Experiment  Falling  film  Absorber  Magnetic  field Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : Experiments of ammonia–water falling film absorption were performed in magnetic fields of different intensities and different directions as well as under varied operating conditions. Experimental results showed that the outlet concentration of ammonia–water, the outlet temperature of cooling water and the amount of absorption heat and mass in downward magnetic field are higher than those in non-magnetic field. However, all of them decreased in the upward magnetic field. Therefore, it can be concluded that the magnetic field with the same direction as falling film enhances the absorption, and the magnetic field with the direction against falling film weakens the absorption of ammonia–water. The results also showed the effect of magnetic field on absorption was more obvious in solutions with low inlet concentration. The influences of the cooling water flow rate, the cooling water inlet temperature and the solution flow rate on absorption in magnetic field were similar to those without magnetic field. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000204

Investigation on capacity matching in liquid desiccant and heat pump hybrid air-conditioning systems / Xiaofeng Niu in International journal of refrigeration, Vol. 35 N° 1 (Janvier 2012) 

Public ISBD [article]  in International journal of refrigeration > Vol. 35 N° 1 (Janvier 2012) . - pp. 160–170 Titre : Investigation on capacity matching in liquid desiccant and heat pump hybrid air-conditioning systems Titre original : Etude sur l’adaptation de la puissance des systèmes de conditionnement d’air hybrides à déshydratant liquide et à pompe à chaleur Type de document : texte imprimé Auteurs : Xiaofeng Niu, Auteur ; Fu Xiao, Auteur ; Zhenjun Ma, Auteur Année de publication : 2012 Article en page(s) : pp. 160–170 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Desiccant  system  Heat  pump  Compression  system  Heat  balance  Simulation Résumé : Liquid desiccant and heat pump (LDHP) hybrid air-conditioning system provides a promising independent air dehumidification solution. Capacity matching among the four major heat and mass transfer components, i.e. dehumidifier, regenerator, evaporator and condenser, is essentially important for energy efficiency of the hybrid system. In this paper, the configuration of the hybrid system is firstly studied. Novel matching indices are proposed to evaluate the matching effect. The results show that a LDHP hybrid system with double-condenser, one solution-cooled and one air-cooled, is a feasible configuration for achieving capacity matching. To achieve dynamic capacity matching under real changing operating conditions, the effects of three critical operating variables, including solution flow rate, revolution of the compressor and air flow rate in the air-cooled condenser, on capacity matching and energy performance are studied. Simulation results show that dynamic capacity matching can only be achieved by regulating these three operating variables simultaneously. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711001939 [article] Investigation on capacity matching in liquid desiccant and heat pump hybrid air-conditioning systems = Etude sur l’adaptation de la puissance des systèmes de conditionnement d’air hybrides à déshydratant liquide et à pompe à chaleur [texte imprimé] / Xiaofeng Niu, Auteur ; Fu Xiao, Auteur ; Zhenjun Ma, Auteur . - 2012 . - pp. 160–170. Génie mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 35 N° 1 (Janvier 2012) . - pp. 160–170 Mots-clés : Desiccant  system  Heat  pump  Compression  system  Heat  balance  Simulation Résumé : Liquid desiccant and heat pump (LDHP) hybrid air-conditioning system provides a promising independent air dehumidification solution. Capacity matching among the four major heat and mass transfer components, i.e. dehumidifier, regenerator, evaporator and condenser, is essentially important for energy efficiency of the hybrid system. In this paper, the configuration of the hybrid system is firstly studied. Novel matching indices are proposed to evaluate the matching effect. The results show that a LDHP hybrid system with double-condenser, one solution-cooled and one air-cooled, is a feasible configuration for achieving capacity matching. To achieve dynamic capacity matching under real changing operating conditions, the effects of three critical operating variables, including solution flow rate, revolution of the compressor and air flow rate in the air-cooled condenser, on capacity matching and energy performance are studied. Simulation results show that dynamic capacity matching can only be achieved by regulating these three operating variables simultaneously. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711001939