Documents disponibles écrits par cet auteur

Accurate adsorption isotherms of R134a onto activated carbons for cooling and freezing applications / Bidyut Baran Saha 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. 499–505 Titre : Accurate adsorption isotherms of R134a onto activated carbons for cooling and freezing applications Titre original : Isothermes d'adsorption précises pour le R134a sur du charbon actif dans les applications de refroidissement et de congélation Type de document : texte imprimé Auteurs : Bidyut Baran Saha, Auteur ; Ibrahim I. El-Sharkawy, Auteur ; Roger Thorpe, Auteur Année de publication : 2012 Article en page(s) : pp. 499–505 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Activated  carbon  Adsorption  isotherm  Cooling  R134a Résumé : The objective of this article is to improve the performance of thermally powered adsorption/cooling systems by selecting a new adsorbent/refrigerant pair. Adsorption equilibrium data of R134a onto granular activated carbon (AC) and Unitika activated carbon fiber (ACF) of type (A-20) have been measured experimentally using Rubotherm ISOSORP 2000 within evaporation temperatures range between −20 and 40 °C and adsorption temperatures range from 30 to 80 °C. Experimental data have been correlated using various popular isotherm models. The isosteric heat of adsorption of the assorted adsorbent/refrigerant pairs has also been extracted from the present experimental data. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711001083 [article] Accurate adsorption isotherms of R134a onto activated carbons for cooling and freezing applications = Isothermes d'adsorption précises pour le R134a sur du charbon actif dans les applications de refroidissement et de congélation [texte imprimé] / Bidyut Baran Saha, Auteur ; Ibrahim I. El-Sharkawy, Auteur ; Roger Thorpe, Auteur . - 2012 . - pp. 499–505. Génie mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 35 N° 3 (Mai 2012) . - pp. 499–505 Mots-clés : Activated  carbon  Adsorption  isotherm  Cooling  R134a Résumé : The objective of this article is to improve the performance of thermally powered adsorption/cooling systems by selecting a new adsorbent/refrigerant pair. Adsorption equilibrium data of R134a onto granular activated carbon (AC) and Unitika activated carbon fiber (ACF) of type (A-20) have been measured experimentally using Rubotherm ISOSORP 2000 within evaporation temperatures range between −20 and 40 °C and adsorption temperatures range from 30 to 80 °C. Experimental data have been correlated using various popular isotherm models. The isosteric heat of adsorption of the assorted adsorbent/refrigerant pairs has also been extracted from the present experimental data. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711001083

On the linear driving force approximation for adsorption cooling applications / Ibrahim I. El-Sharkawy in International journal of refrigeration, Vol. 34 N° 3 (Mai 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 3 (Mai 2011) . - pp. 667-673 Titre : On the linear driving force approximation for adsorption cooling applications Titre original : Approximation de la force motrice linéaire dans les applications du refroidissement à adsorption Type de document : texte imprimé Auteurs : Ibrahim I. El-Sharkawy, Auteur Année de publication : 2011 Article en page(s) : pp. 667-673 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Adsorption  System  Cooling  Silica  gel  Water Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper aims to address the effect of using classical Linear Driving Force (LDF) model on the performance of adsorption chillers. A comparative study between the well known LDF equation and the Fickian diffusion (FD) model has been conducted. Two adsorbent/refrigerant pairs namely, RD silica gel/water and “CaCl2 confined to KSK silica gel”/water pairs have been used. Relative and absolute errors between adsorption uptakes estimated by both models have been estimated. It is found that the LDF model has numerous errors at relatively shorter adsorption times which imply that using LDF equation may lead to incorrect evaluation of the performance of adsorption chiller especially at short cycle times. This study also presents an improved form of LDF model considering the dependency of the particle mass transfer coefficient on the dimensionless time. Theoretical calculations show good agreement between the improved LDF approximation and the FD model. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S014070071000280X [article] On the linear driving force approximation for adsorption cooling applications = Approximation de la force motrice linéaire dans les applications du refroidissement à adsorption [texte imprimé] / Ibrahim I. El-Sharkawy, Auteur . - 2011 . - pp. 667-673. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 3 (Mai 2011) . - pp. 667-673 Mots-clés : Adsorption  System  Cooling  Silica  gel  Water Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : This paper aims to address the effect of using classical Linear Driving Force (LDF) model on the performance of adsorption chillers. A comparative study between the well known LDF equation and the Fickian diffusion (FD) model has been conducted. Two adsorbent/refrigerant pairs namely, RD silica gel/water and “CaCl2 confined to KSK silica gel”/water pairs have been used. Relative and absolute errors between adsorption uptakes estimated by both models have been estimated. It is found that the LDF model has numerous errors at relatively shorter adsorption times which imply that using LDF equation may lead to incorrect evaluation of the performance of adsorption chiller especially at short cycle times. This study also presents an improved form of LDF model considering the dependency of the particle mass transfer coefficient on the dimensionless time. Theoretical calculations show good agreement between the improved LDF approximation and the FD model. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S014070071000280X