Documents disponibles écrits par cet auteur

Choice of low temperature salt for a resorption refrigerator / H. S. Bao in Industrial & engineering chemistry research, Vol. 49 N° 10 (Mai 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4897–4903 Titre : Choice of low temperature salt for a resorption refrigerator Type de document : texte imprimé Auteurs : H. S. Bao, Auteur ; R.G. Oliveira, Auteur ; R.Z. Wang, Auteur Année de publication : 2010 Article en page(s) : pp. 4897–4903 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Mass  refrigerant Résumé : Three bench-scale resorption systems were compared with respect to the degree of conversion, the specific cooling power, and the influence of the working condition on the temperature equilibrium drop. The mass of refrigerant that reacted during specified periods of each working condition studied was assessed gravimetrically. The three systems had MnCl2 in the main reactor, and they were designed to provide a cooling effect at 0 and at −5 °C. However, each system had a different salt (BaCl2, NaBr, or NH4Cl) in the reactor employed for cold production. The system with NH4Cl was the most suitable for cold production at the temperatures indicated above, whereas the system with BaCl2 was not suitable to operate at these levels of cooling production. Thus, we designed and manufactured a larger resorption system and assessed the feasibility of using this system to refrigerate a 33 L cold box, with two temperature zones. When the ambient temperature was 30 °C, the air temperature in the bottom of the cold box could be kept below 0 °C for 5 h, while the temperature of the upper zone remained below 6 °C for about 2.5 h. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901575k [article] Choice of low temperature salt for a resorption refrigerator [texte imprimé] / H. S. Bao, Auteur ; R.G. Oliveira, Auteur ; R.Z. Wang, Auteur . - 2010 . - pp. 4897–4903. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4897–4903 Mots-clés : Mass  refrigerant Résumé : Three bench-scale resorption systems were compared with respect to the degree of conversion, the specific cooling power, and the influence of the working condition on the temperature equilibrium drop. The mass of refrigerant that reacted during specified periods of each working condition studied was assessed gravimetrically. The three systems had MnCl2 in the main reactor, and they were designed to provide a cooling effect at 0 and at −5 °C. However, each system had a different salt (BaCl2, NaBr, or NH4Cl) in the reactor employed for cold production. The system with NH4Cl was the most suitable for cold production at the temperatures indicated above, whereas the system with BaCl2 was not suitable to operate at these levels of cooling production. Thus, we designed and manufactured a larger resorption system and assessed the feasibility of using this system to refrigerate a 33 L cold box, with two temperature zones. When the ambient temperature was 30 °C, the air temperature in the bottom of the cold box could be kept below 0 °C for 5 h, while the temperature of the upper zone remained below 6 °C for about 2.5 h. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901575k

Experimental study on a combined double-way chemisorption refrigeration system / L. Xu 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. 914-921 Titre : Experimental study on a combined double-way chemisorption refrigeration system Titre original : Etude expérimentale sur un système frigorifique à sorption chimique utilisant deux lits adsorbants Type de document : texte imprimé Auteurs : L. Xu, Auteur ; R.Z. Wang, Auteur ; T.X. Li, Auteur Année de publication : 2011 Article en page(s) : pp. 914-921 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Sorption  Refrigeration  COP  Adsorption  Resorption Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A combined double-way chemisorption refrigeration system was described and investigated, and the experimental test unit was built, which consists of two adsorption beds: one high-temperature salt bed (HTS bed), which is filled with manganese chloride; and one low-temperature salt bed (LTS bed), which is filled with barium chloride. Moreover, the working performance of double-way chemisorption refrigeration cycle was studied. This cycle uses only one heat input to get two cold outputs, one of which comes from the evaporation heat produced by the refrigerant during the adsorption process, and another of which is from decomposition reaction heat consumed by LTS during the resorption process. The experimental results showed that the coefficient of performance (COP) and specific cooling power (SCP) were 0.703 and 225 W kg−1 respectively at the refrigeration temperature of 15 °C, regeneration temperature of 160 °C and heat sink temperature of 30 °C. Also, the relation between the average global conversion and the COP value were found and analyzed. And the choice of salts and optimum reaction time were discussed either. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000673 [article] Experimental study on a combined double-way chemisorption refrigeration system = Etude expérimentale sur un système frigorifique à sorption chimique utilisant deux lits adsorbants [texte imprimé] / L. Xu, Auteur ; R.Z. Wang, Auteur ; T.X. Li, Auteur . - 2011 . - pp. 914-921. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 4 (Juin 2011) . - pp. 914-921 Mots-clés : Sorption  Refrigeration  COP  Adsorption  Resorption Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A combined double-way chemisorption refrigeration system was described and investigated, and the experimental test unit was built, which consists of two adsorption beds: one high-temperature salt bed (HTS bed), which is filled with manganese chloride; and one low-temperature salt bed (LTS bed), which is filled with barium chloride. Moreover, the working performance of double-way chemisorption refrigeration cycle was studied. This cycle uses only one heat input to get two cold outputs, one of which comes from the evaporation heat produced by the refrigerant during the adsorption process, and another of which is from decomposition reaction heat consumed by LTS during the resorption process. The experimental results showed that the coefficient of performance (COP) and specific cooling power (SCP) were 0.703 and 225 W kg−1 respectively at the refrigeration temperature of 15 °C, regeneration temperature of 160 °C and heat sink temperature of 30 °C. Also, the relation between the average global conversion and the COP value were found and analyzed. And the choice of salts and optimum reaction time were discussed either. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000673

Performance analysis of a multi-mode thermochemical sorption refrigeration system for solar-powered cooling / T.X. Li in International journal of refrigeration, Vol. 35 N° 3 (Mai 2012) 

Public ISBD [article]  in International journal of refrigeration > Vol. 35 N° 3 (Mai 2012) . - pp. 532–542 Titre : Performance analysis of a multi-mode thermochemical sorption refrigeration system for solar-powered cooling Titre original : Analyse de la performance d’un système frigorifique thermochimique à sorption multimodal pour le refroidissement solaire Type de document : texte imprimé Auteurs : T.X. Li, Auteur ; R.Z. Wang, Auteur ; J.K. Kiplaga, Auteur Année de publication : 2012 Article en page(s) : pp. 532–542 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Solar  energy  Sorption  system  Refrigeration  Heat  recovery  Thermodynamic  cycle Résumé : A multi-mode thermochemical sorption refrigeration system is presented for solar-powered cooling. The proposed system consists of three sorption refrigeration thermodynamic cycles that can be alternately operated based on the available solar energy insolation viz: combined double-way cycle, double-effect cycle and two-stage cycle. The working performance of the different sorption refrigeration cycles were theoretically analyzed and compared. For combined double-way sorption cycle, both adsorption refrigeration and resorption refrigeration were combined to improve the cooling capacity. For double-effect sorption cycle, one internal heat recovery process was employed to enhance the energy utilization efficiency. For two-stage cycle with internal heat recovery process, a secondary reactive salt was used to lower the driving regeneration temperature. Thermodynamic analysis showed that the working modes of the proposed system can be switched according to the different driving heat source temperatures. In comparison with the conventional solar solid-gas sorption refrigeration system, the presented multi-mode system can contribute to improving the utilization efficiency of solar energy and widening the scope of application of solar thermochemical sorption refrigerator. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711002738 [article] Performance analysis of a multi-mode thermochemical sorption refrigeration system for solar-powered cooling = Analyse de la performance d’un système frigorifique thermochimique à sorption multimodal pour le refroidissement solaire [texte imprimé] / T.X. Li, Auteur ; R.Z. Wang, Auteur ; J.K. Kiplaga, Auteur . - 2012 . - pp. 532–542. Génie mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 35 N° 3 (Mai 2012) . - pp. 532–542 Mots-clés : Solar  energy  Sorption  system  Refrigeration  Heat  recovery  Thermodynamic  cycle Résumé : A multi-mode thermochemical sorption refrigeration system is presented for solar-powered cooling. The proposed system consists of three sorption refrigeration thermodynamic cycles that can be alternately operated based on the available solar energy insolation viz: combined double-way cycle, double-effect cycle and two-stage cycle. The working performance of the different sorption refrigeration cycles were theoretically analyzed and compared. For combined double-way sorption cycle, both adsorption refrigeration and resorption refrigeration were combined to improve the cooling capacity. For double-effect sorption cycle, one internal heat recovery process was employed to enhance the energy utilization efficiency. For two-stage cycle with internal heat recovery process, a secondary reactive salt was used to lower the driving regeneration temperature. Thermodynamic analysis showed that the working modes of the proposed system can be switched according to the different driving heat source temperatures. In comparison with the conventional solar solid-gas sorption refrigeration system, the presented multi-mode system can contribute to improving the utilization efficiency of solar energy and widening the scope of application of solar thermochemical sorption refrigerator. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711002738

Resorption system with simultaneous heat and cold production / J. Xu in International journal of refrigeration, Vol. 34 N° 5 (Août 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 5 (Août 2011) . - pp. 1262-1267 Titre : Resorption system with simultaneous heat and cold production Titre original : Système à résorption produisant de la chaleur et du froid simultanément Type de document : texte imprimé Auteurs : J. Xu, Auteur ; R.G. Oliveira, Auteur ; R.Z. Wang, Auteur Année de publication : 2011 Article en page(s) : pp. 1262-1267 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Resorption  Adsorption  system  Heating  Cooling  Recovery Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A resorption system with simultaneous cold and heat production was studied. The heat produced could be used for sanitary or process purposes, or to drive another heat-powered machine. The resorption reactors had MnCl2 and NH4Cl as reactant (which are impregnated in expanded graphite) and NH3 as refrigerant. The combined coefficient of performance and amplification (COPA) of this system reached 1.3 when the cooling effect was produced at 0 °C and heating effect at 75 °C with the regeneration temperature of 140 °C. Its COP was 0.35 with a specific cooling power (SCP) of 1.12 MJ kg−1 day−1, and the heat sink in this case remained below the cooling temperature for more than 5 h. Because of the heat production at certain temperature level (from 70 °C to 80 °C) in this study, the released heat could be used to power a silica gel-water adsorption chiller and the overall COP of the combined system would increase dramatically. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000752 [article] Resorption system with simultaneous heat and cold production = Système à résorption produisant de la chaleur et du froid simultanément [texte imprimé] / J. Xu, Auteur ; R.G. Oliveira, Auteur ; R.Z. Wang, Auteur . - 2011 . - pp. 1262-1267. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 5 (Août 2011) . - pp. 1262-1267 Mots-clés : Resorption  Adsorption  system  Heating  Cooling  Recovery Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : A resorption system with simultaneous cold and heat production was studied. The heat produced could be used for sanitary or process purposes, or to drive another heat-powered machine. The resorption reactors had MnCl2 and NH4Cl as reactant (which are impregnated in expanded graphite) and NH3 as refrigerant. The combined coefficient of performance and amplification (COPA) of this system reached 1.3 when the cooling effect was produced at 0 °C and heating effect at 75 °C with the regeneration temperature of 140 °C. Its COP was 0.35 with a specific cooling power (SCP) of 1.12 MJ kg−1 day−1, and the heat sink in this case remained below the cooling temperature for more than 5 h. Because of the heat production at certain temperature level (from 70 °C to 80 °C) in this study, the released heat could be used to power a silica gel-water adsorption chiller and the overall COP of the combined system would increase dramatically. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000752