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Effect of alkaline hydroxides on the vapor − liquid equilibrium of ammonia / water and the performance of absorption chillers / Simona Steiu in Industrial & engineering chemistry research, Vol. 50 N° 23 (Décembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 13037-13044 Titre : Effect of alkaline hydroxides on the vapor − liquid equilibrium of ammonia / water and the performance of absorption chillers Type de document : texte imprimé Auteurs : Simona Steiu, Auteur ; David Martínez-Maradiaga, Auteur ; Daniel Salavera, Auteur Année de publication : 2012 Article en page(s) : pp. 13037-13044 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Phase  equilibrium  Liquid  vapor  equilibrium Résumé : New simple and accurate correlations of the equilibrium properties and solution enthalpies for NH3/H2O/alkaline hydroxide mixtures are presented for use in the modeling and design of absorption chillers in a temperature range between 273.15 and 353.15 K. The correlations are used to calculate the P—T—x diagrams and show the effect of hydroxide on the liquid-vapor equilibrium. Finally, the correlations presented are used to estimate the improvement in the cycle performance in absorption chillers when NH3/H2O mixtures containing NaOH are used instead of the conventional NH3/H2O mixture. Results show that the addition of hydroxide can significantly decrease the generator temperature of ammonia/water absorption refrigeration cycles while simultaneously increasing the Coefficient of Performance (COP). For a NaOH concentration of 12%, the temperature at the generator decreases by about 17°C, the COP increases by 28%, and the size of the rectifier can be up to 46% less than that required when the conventional NH3/H2O cycle is used. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25267461 [article] Effect of alkaline hydroxides on the vapor − liquid equilibrium of ammonia / water and the performance of absorption chillers [texte imprimé] / Simona Steiu, Auteur ; David Martínez-Maradiaga, Auteur ; Daniel Salavera, Auteur . - 2012 . - pp. 13037-13044. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 13037-13044 Mots-clés : Phase  equilibrium  Liquid  vapor  equilibrium Résumé : New simple and accurate correlations of the equilibrium properties and solution enthalpies for NH3/H2O/alkaline hydroxide mixtures are presented for use in the modeling and design of absorption chillers in a temperature range between 273.15 and 353.15 K. The correlations are used to calculate the P—T—x diagrams and show the effect of hydroxide on the liquid-vapor equilibrium. Finally, the correlations presented are used to estimate the improvement in the cycle performance in absorption chillers when NH3/H2O mixtures containing NaOH are used instead of the conventional NH3/H2O mixture. Results show that the addition of hydroxide can significantly decrease the generator temperature of ammonia/water absorption refrigeration cycles while simultaneously increasing the Coefficient of Performance (COP). For a NaOH concentration of 12%, the temperature at the generator decreases by about 17°C, the COP increases by 28%, and the size of the rectifier can be up to 46% less than that required when the conventional NH3/H2O cycle is used. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25267461