Documents disponibles écrits par cet auteur

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

Thermal conductivity of ammonia + lithium nitrate and ammonia + lithium nitrate + water solutions over a wide range of concentrations and temperatures / Yolanda Cuenca in International journal of refrigeration, Vol. 38 (Février 2014) 

Public ISBD [article]  in International journal of refrigeration > Vol. 38 (Février 2014) . - pp. 333–340 Titre : Thermal conductivity of ammonia + lithium nitrate and ammonia + lithium nitrate + water solutions over a wide range of concentrations and temperatures Titre original : La conductivité thermique de solutions d'ammoniac/nitrate de lithium et d'ammoniac/nitrate de lithium/eau à une large gamme de concentrations et de températures Type de document : texte imprimé Auteurs : Yolanda Cuenca, Auteur ; Daniel Salavera, Auteur ; Anton Vernet, Auteur Année de publication : 2014 Article en page(s) : pp. 333–340 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Thermal  conductivity;  Ammonia  +  lithium  nitrate;  Transient  hot  wire  method;  Absorption  refrigeration Résumé : The thermal conductivity of NH3 + LiNO3 and NH3 + LiNO3 + H2O mixtures with an ammonia mass fraction between 0.3 and 0.6 was measured at temperatures from 303.15 K to 353.15 K at 1.5 MPa, using a relative transient hot wire apparatus. The apparatus and method were validated by comparing the measured values of the thermal conductivity of pure water, toluene, dimethyl phthalate, ethylene glycol and water + lithium nitrate with published values. Uncertainty in the measurements was estimated to be less than 0.025 W m−1 K−1. The measured NH3 + LiNO3 thermal conductivity was compared with the literature, showing significant differences. Finally, the experimental data was fitted with a comprehensive model based on the local composition concept. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713002168 [article] Thermal conductivity of ammonia + lithium nitrate and ammonia + lithium nitrate + water solutions over a wide range of concentrations and temperatures = La conductivité thermique de solutions d'ammoniac/nitrate de lithium et d'ammoniac/nitrate de lithium/eau à une large gamme de concentrations et de températures [texte imprimé] / Yolanda Cuenca, Auteur ; Daniel Salavera, Auteur ; Anton Vernet, Auteur . - 2014 . - pp. 333–340. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 38 (Février 2014) . - pp. 333–340 Mots-clés : Thermal  conductivity;  Ammonia  +  lithium  nitrate;  Transient  hot  wire  method;  Absorption  refrigeration Résumé : The thermal conductivity of NH3 + LiNO3 and NH3 + LiNO3 + H2O mixtures with an ammonia mass fraction between 0.3 and 0.6 was measured at temperatures from 303.15 K to 353.15 K at 1.5 MPa, using a relative transient hot wire apparatus. The apparatus and method were validated by comparing the measured values of the thermal conductivity of pure water, toluene, dimethyl phthalate, ethylene glycol and water + lithium nitrate with published values. Uncertainty in the measurements was estimated to be less than 0.025 W m−1 K−1. The measured NH3 + LiNO3 thermal conductivity was compared with the literature, showing significant differences. Finally, the experimental data was fitted with a comprehensive model based on the local composition concept. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700713002168

Thermal conductivity of ammonia + water mixtures over a wide range of concentrations / Yolanda Cuenca 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. 998–1003 Titre : Thermal conductivity of ammonia + water mixtures over a wide range of concentrations Titre original : Conductivité thermique des mélanges ammoniac / eau pour un large éventail de concentrations Type de document : texte imprimé Auteurs : Yolanda Cuenca, Auteur ; Daniel Salavera, Auteur ; Anton Vernet, Auteur Année de publication : 2013 Article en page(s) : pp. 998–1003 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Thermal  conductivity;  Ammonia  +  water;  Transient  hot-wire  method;  Absorption  refrigeration Résumé : The thermal conductivity of NH3 + H2O mixtures (with 0.1–0.5 mass fraction ammonia) was measured at temperatures between 293.15 K and 313.15 K using a transient hot-wire apparatus. The apparatus and method were validated by comparing the measured values of the thermal conductivity of pure water and water + lithium nitrate mixtures with published values. Uncertainty in the measurements was estimated to be less than 0.017 W m−1 K−1. The thermal conductivities of NH3 + H2O mixtures were compared with the literature values and also fitted with several well-known models. En ligne : http://www.sciencedirect.com/science/article/pii/S014070071200299X [article] Thermal conductivity of ammonia + water mixtures over a wide range of concentrations = Conductivité thermique des mélanges ammoniac / eau pour un large éventail de concentrations [texte imprimé] / Yolanda Cuenca, Auteur ; Daniel Salavera, Auteur ; Anton Vernet, Auteur . - 2013 . - pp. 998–1003. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 998–1003 Mots-clés : Thermal  conductivity;  Ammonia  +  water;  Transient  hot-wire  method;  Absorption  refrigeration Résumé : The thermal conductivity of NH3 + H2O mixtures (with 0.1–0.5 mass fraction ammonia) was measured at temperatures between 293.15 K and 313.15 K using a transient hot-wire apparatus. The apparatus and method were validated by comparing the measured values of the thermal conductivity of pure water and water + lithium nitrate mixtures with published values. Uncertainty in the measurements was estimated to be less than 0.017 W m−1 K−1. The thermal conductivities of NH3 + H2O mixtures were compared with the literature values and also fitted with several well-known models. En ligne : http://www.sciencedirect.com/science/article/pii/S014070071200299X