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An advanced analytical model of the Diffusion Absorption Refrigerator cycle / Giuseppe Starace 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. 605–612 Titre : An advanced analytical model of the Diffusion Absorption Refrigerator cycle Titre original : Modèle analytique de pointe du cycle frigorifique à absorption à diffusion Type de document : texte imprimé Auteurs : Giuseppe Starace, Auteur ; Lorenzo De Pascalis, Auteur Année de publication : 2012 Article en page(s) : pp. 605–612 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Adsorption  Diffusion  absorption  refrigerator  Diffusion  system  Analytical  model  Refrigeration  cycle Résumé : The results about the performance of a new DAR’s thermodynamic model are compared with the predictions of Zohar et al. (2009). The main difference is due to an accurate modeling of the refrigerant composition, assumed there as pure ammonia. A sensitivity analysis shows that, as the generator temperature increases, the rich solution mass flowrate reduces more than that of the refrigerant one, and COP decreases. This happens as the absorption temperature increases as well, due to the lower absorption of ammonia in the weak solution. COP was found to increase when the ammonia concentration decreases. In addition, for lower heat fluxes supplied to the generator, the heat dissipation toward ambient dominates and COP becomes small; when the heat flux overtakes a threshold, the evaporator reaches its maximum heat transfer, that remains constant for any further increase of heat supplied. COP presents its highest values over a limited range of the generator’s operating conditions. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711002751 [article] An advanced analytical model of the Diffusion Absorption Refrigerator cycle = Modèle analytique de pointe du cycle frigorifique à absorption à diffusion [texte imprimé] / Giuseppe Starace, Auteur ; Lorenzo De Pascalis, Auteur . - 2012 . - pp. 605–612. Génie mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 35 N° 3 (Mai 2012) . - pp. 605–612 Mots-clés : Adsorption  Diffusion  absorption  refrigerator  Diffusion  system  Analytical  model  Refrigeration  cycle Résumé : The results about the performance of a new DAR’s thermodynamic model are compared with the predictions of Zohar et al. (2009). The main difference is due to an accurate modeling of the refrigerant composition, assumed there as pure ammonia. A sensitivity analysis shows that, as the generator temperature increases, the rich solution mass flowrate reduces more than that of the refrigerant one, and COP decreases. This happens as the absorption temperature increases as well, due to the lower absorption of ammonia in the weak solution. COP was found to increase when the ammonia concentration decreases. In addition, for lower heat fluxes supplied to the generator, the heat dissipation toward ambient dominates and COP becomes small; when the heat flux overtakes a threshold, the evaporator reaches its maximum heat transfer, that remains constant for any further increase of heat supplied. COP presents its highest values over a limited range of the generator’s operating conditions. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711002751