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Heat and mass transfer studies on a compact bubble absorber in R134a-DMF solution based vapour absorption refrigeration system / M. Suresh 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. 1004–1014 Titre : Heat and mass transfer studies on a compact bubble absorber in R134a-DMF solution based vapour absorption refrigeration system Titre original : Etudes sur le transfert de chaleur et de masse dans l'absorbeur à bulles au R134a/DMF d'un système frigorifique à absorption de vapeur Type de document : texte imprimé Auteurs : M. Suresh, Auteur ; A. Mani, Auteur Année de publication : 2013 Article en page(s) : pp. 1004–1014 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Absorption  system;  R134a;  Dimethyl  formamide;  Plate  heat  exchanger;  Heat  transfer;  Mass  transfer;  Correlation Résumé : Experimental investigations have been carried out to study heat and mass transfer characteristics of Tetrafluoro ethane (R134a) in Dimethyl formamide (DMF) solution in a compact bubble absorber of vapour absorption refrigeration system of 1 TR capacity. Plate heat exchangers have been used as system components. Bubble absorption principle is employed in the absorber and hot water supplies heat to the generator. Effect of operating parameters such as circulation ratio, absorber and generator temperatures on heat and mass transfer effectiveness, overall heat transfer coefficient and volumetric mass transfer coefficient are investigated. It is found that heat and mass transfer effectiveness of absorber are better at lower circulation ratios and higher generator temperatures. Experimental results are compared with those obtained from numerical model developed earlier by the authors and the agreement is generally fair. From the experimental data, a correlation has been obtained for volumetric mass transfer coefficient, using multi-linear regression analysis. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712002939 [article] Heat and mass transfer studies on a compact bubble absorber in R134a-DMF solution based vapour absorption refrigeration system = Etudes sur le transfert de chaleur et de masse dans l'absorbeur à bulles au R134a/DMF d'un système frigorifique à absorption de vapeur [texte imprimé] / M. Suresh, Auteur ; A. Mani, Auteur . - 2013 . - pp. 1004–1014. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 1004–1014 Mots-clés : Absorption  system;  R134a;  Dimethyl  formamide;  Plate  heat  exchanger;  Heat  transfer;  Mass  transfer;  Correlation Résumé : Experimental investigations have been carried out to study heat and mass transfer characteristics of Tetrafluoro ethane (R134a) in Dimethyl formamide (DMF) solution in a compact bubble absorber of vapour absorption refrigeration system of 1 TR capacity. Plate heat exchangers have been used as system components. Bubble absorption principle is employed in the absorber and hot water supplies heat to the generator. Effect of operating parameters such as circulation ratio, absorber and generator temperatures on heat and mass transfer effectiveness, overall heat transfer coefficient and volumetric mass transfer coefficient are investigated. It is found that heat and mass transfer effectiveness of absorber are better at lower circulation ratios and higher generator temperatures. Experimental results are compared with those obtained from numerical model developed earlier by the authors and the agreement is generally fair. From the experimental data, a correlation has been obtained for volumetric mass transfer coefficient, using multi-linear regression analysis. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712002939

Heat and mass transfer studies on compact generator of R134a/DMF vapour absorption refrigeration system / P. Balamurugan 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. 506–517 Titre : Heat and mass transfer studies on compact generator of R134a/DMF vapour absorption refrigeration system Titre original : Etudes sur le transfert de chaleur et de masse dans un système frigorifique compact à absorption de vapeur au R134a/DMF Type de document : texte imprimé Auteurs : P. Balamurugan, Auteur ; A. Mani, Auteur Année de publication : 2012 Article en page(s) : pp. 506–517 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : R134a  DMF  Generator  Absorption  system  Heat  transfer  Mass  transfer Résumé : Experimental investigation on the performance of compact generator of R134a/DMF vapour absorption refrigeration system is presented. The system uses brazed plate heat exchangers as generator, condenser, absorber, evaporator and solution heat exchanger and has a rated cooling capacity of 1 kW. The influence of driving temperature ratio, driving pressure ratio, R134a mass fraction and solution two phase Reynolds number is studied. This kind of system can be operated with low grade thermal energy such as solar energy, waste heat, etc. The generator temperature is chosen accordingly between 353 K and 368 K. Desorption ratio and Sherwood number increase as the solution Reynolds number, solution initial mass fraction, and driving temperature ratio increase whereas they decrease as the driving pressure ratio increases. The performance of the compact generator at different operating conditions is presented. Based on the present data, empirical correlations for Nusselt number and Sherwood number are proposed. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712000102 [article] Heat and mass transfer studies on compact generator of R134a/DMF vapour absorption refrigeration system = Etudes sur le transfert de chaleur et de masse dans un système frigorifique compact à absorption de vapeur au R134a/DMF [texte imprimé] / P. Balamurugan, Auteur ; A. Mani, Auteur . - 2012 . - pp. 506–517. Génie mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 35 N° 3 (Mai 2012) . - pp. 506–517 Mots-clés : R134a  DMF  Generator  Absorption  system  Heat  transfer  Mass  transfer Résumé : Experimental investigation on the performance of compact generator of R134a/DMF vapour absorption refrigeration system is presented. The system uses brazed plate heat exchangers as generator, condenser, absorber, evaporator and solution heat exchanger and has a rated cooling capacity of 1 kW. The influence of driving temperature ratio, driving pressure ratio, R134a mass fraction and solution two phase Reynolds number is studied. This kind of system can be operated with low grade thermal energy such as solar energy, waste heat, etc. The generator temperature is chosen accordingly between 353 K and 368 K. Desorption ratio and Sherwood number increase as the solution Reynolds number, solution initial mass fraction, and driving temperature ratio increase whereas they decrease as the driving pressure ratio increases. The performance of the compact generator at different operating conditions is presented. Based on the present data, empirical correlations for Nusselt number and Sherwood number are proposed. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712000102