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Evaluation of methanol/activated carbons for thermally driven chillers, part II / M. Schicktanz 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. 554–561 Titre : Evaluation of methanol/activated carbons for thermally driven chillers, part II : The energy balance model Titre original : Evaluation des couples actifs méthanol / charbon actif utilisés dans les refroidisseurs entraînés par la chaleur. Partie II: le modèle de bilan thermique Type de document : texte imprimé Auteurs : M. Schicktanz, Auteur ; P. Hügenell, Auteur ; S.K. Henninger, Auteur Année de publication : 2012 Article en page(s) : pp. 554–561 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Adsorption  Methanol  Activated  carbon  COP  Chilling  Energy  balance Résumé : This paper describes a simple energy balance model based on static parameters to calculate the COP of an adsorption chiller. The model leads to an analytical equation using basic information about the working pair, the chiller design and the operation temperatures. A set of dimensionless key figures is derived for better understanding of the influence of physical parameters on the COP. These key figures are investigated in this paper. In contrast to absorption chillers, desorption is not an isobaric process in adsorption chillers. The influence of the path is discussed in the limits of isobaric and isothermal desorption. Furthermore, the model is applied to a set of new material data, focussingfocussing on methanol/activated carbon as the working pair. This working pair makes refrigeration below 0°C feasible. This paper is the second of two articles about the measurement and evaluation of methanol/activated carbon for cooling purposes in adsorption chillers. The first part contains the experimental description and the thermophysical properties of methanol/activated carbon. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000776 [article] Evaluation of methanol/activated carbons for thermally driven chillers, part II = Evaluation des couples actifs méthanol / charbon actif utilisés dans les refroidisseurs entraînés par la chaleur. Partie II: le modèle de bilan thermique : The energy balance model [texte imprimé] / M. Schicktanz, Auteur ; P. Hügenell, Auteur ; S.K. Henninger, Auteur . - 2012 . - pp. 554–561. Génie mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 35 N° 3 (Mai 2012) . - pp. 554–561 Mots-clés : Adsorption  Methanol  Activated  carbon  COP  Chilling  Energy  balance Résumé : This paper describes a simple energy balance model based on static parameters to calculate the COP of an adsorption chiller. The model leads to an analytical equation using basic information about the working pair, the chiller design and the operation temperatures. A set of dimensionless key figures is derived for better understanding of the influence of physical parameters on the COP. These key figures are investigated in this paper. In contrast to absorption chillers, desorption is not an isobaric process in adsorption chillers. The influence of the path is discussed in the limits of isobaric and isothermal desorption. Furthermore, the model is applied to a set of new material data, focussingfocussing on methanol/activated carbon as the working pair. This working pair makes refrigeration below 0°C feasible. This paper is the second of two articles about the measurement and evaluation of methanol/activated carbon for cooling purposes in adsorption chillers. The first part contains the experimental description and the thermophysical properties of methanol/activated carbon. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000776

Evaluation of methanol adsorption on activated carbons for thermally driven chillers part I / S.K. Henninger 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. 543–553 Titre : Evaluation of methanol adsorption on activated carbons for thermally driven chillers part I : Thermophysical characterisation Titre original : Evaluation de l'adsorption de méthanol sur du charbon actif dans les refroidisseurs à entraînement thermique. Partie I: caractérisation thermophysique Type de document : texte imprimé Auteurs : S.K. Henninger, Auteur ; M. Schicktanz, Auteur ; P.P.C. Hügenell, Auteur Année de publication : 2012 Article en page(s) : pp. 543–553 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Activated  carbon  Methanol  Heat  pump  Adsorption  system  Refrigerating  unit  Thermodynamic  cycle Résumé : In this first part a comprehensive thermophysical characterisation of six activated carbons – based on coconut, peat and stone coal with focus on thermally driven chillers is reported. Pore and surface analysis are performed using N2 and CO2 adsorption. Furthermore the density and heat capacity of the samples is determined. Methanol adsorption measurements for evaporation between −5 °C and 35 °C and driving temperatures up to 130 °C are realized using a thermobalance and evaluated using the Dubinin–Astakhov (DA) approach. Based on the given DA equations, the possible loading lifts for typical applications like 95°-35°-7 °C are calculated. The samples show very attractive maximum loading lifts up to 0.385 g g−1. Furthermore the mass and volume specific cooling enthalpy of 244 kJ kg−1 and 126 kJ dm−3 under realistic conditions demonstrates the good performance of this working pair. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711002489 [article] Evaluation of methanol adsorption on activated carbons for thermally driven chillers part I = Evaluation de l'adsorption de méthanol sur du charbon actif dans les refroidisseurs à entraînement thermique. Partie I: caractérisation thermophysique : Thermophysical characterisation [texte imprimé] / S.K. Henninger, Auteur ; M. Schicktanz, Auteur ; P.P.C. Hügenell, Auteur . - 2012 . - pp. 543–553. Génie mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 35 N° 3 (Mai 2012) . - pp. 543–553 Mots-clés : Activated  carbon  Methanol  Heat  pump  Adsorption  system  Refrigerating  unit  Thermodynamic  cycle Résumé : In this first part a comprehensive thermophysical characterisation of six activated carbons – based on coconut, peat and stone coal with focus on thermally driven chillers is reported. Pore and surface analysis are performed using N2 and CO2 adsorption. Furthermore the density and heat capacity of the samples is determined. Methanol adsorption measurements for evaporation between −5 °C and 35 °C and driving temperatures up to 130 °C are realized using a thermobalance and evaluated using the Dubinin–Astakhov (DA) approach. Based on the given DA equations, the possible loading lifts for typical applications like 95°-35°-7 °C are calculated. The samples show very attractive maximum loading lifts up to 0.385 g g−1. Furthermore the mass and volume specific cooling enthalpy of 244 kJ kg−1 and 126 kJ dm−3 under realistic conditions demonstrates the good performance of this working pair. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711002489