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Modeling non-uniform frost growth on a fin-and-tube heat exchanger / S.K. Padhmanabhan in International journal of refrigeration, Vol. 34 N° 8 (Décembre 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 8 (Décembre 2011) . - pp. 2018–2030 Titre : Modeling non-uniform frost growth on a fin-and-tube heat exchanger Titre original : Modélisation de la formation de givre non uniforme sur un échangeur de chaleur à tubes ailetés Type de document : texte imprimé Auteurs : S.K. Padhmanabhan, Auteur ; D.E. Fisher, Auteur ; L. Cremaschi, Auteur Année de publication : 2012 Article en page(s) : pp. 2018–2030 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Frost  Modeling  Finned  tube  Air  distribution Résumé : A semi-empirical model that predicts non-uniform frost growth on heat exchangers is developed and experimentally validated. The model is based on a scaling approach that uses the average frost layer properties to predict growth in a quasi-steady state, heat and mass balance based segment-by-segment coil simulation. The air redistribution algorithm in the model improved frost thickness predictions by 20%–50% and coil capacity predictions by 42% compared to the same model without air redistribution. The model along with an empirical frost delay predicted the frost thickness for different inlet refrigerant temperatures, air relative humidities and air velocities under non-uniform frosting with a root mean square error of 3.7%, 9.8% and 5.2% respectively. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711001459 [article] Modeling non-uniform frost growth on a fin-and-tube heat exchanger = Modélisation de la formation de givre non uniforme sur un échangeur de chaleur à tubes ailetés [texte imprimé] / S.K. Padhmanabhan, Auteur ; D.E. Fisher, Auteur ; L. Cremaschi, Auteur . - 2012 . - pp. 2018–2030. Génie mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 8 (Décembre 2011) . - pp. 2018–2030 Mots-clés : Frost  Modeling  Finned  tube  Air  distribution Résumé : A semi-empirical model that predicts non-uniform frost growth on heat exchangers is developed and experimentally validated. The model is based on a scaling approach that uses the average frost layer properties to predict growth in a quasi-steady state, heat and mass balance based segment-by-segment coil simulation. The air redistribution algorithm in the model improved frost thickness predictions by 20%–50% and coil capacity predictions by 42% compared to the same model without air redistribution. The model along with an empirical frost delay predicted the frost thickness for different inlet refrigerant temperatures, air relative humidities and air velocities under non-uniform frosting with a root mean square error of 3.7%, 9.8% and 5.2% respectively. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711001459