Documents disponibles écrits par cet auteur

A new model for plate heat exchangers with generalized flow configurations and phase change / Hongtao Qiao in International journal of refrigeration, Vol. 36 N° 2 (N° spécial) (Mars 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 2 (N° spécial) (Mars 2013) . - pp. 622–632 Titre : A new model for plate heat exchangers with generalized flow configurations and phase change Titre original : Nouveau modèle d’échangeur à plaques intégrant des configurations d’écoulement généralisées et des changements de phase Type de document : texte imprimé Auteurs : Hongtao Qiao, Auteur ; Vikrant Aute, Auteur ; Hoseong Lee, Auteur Année de publication : 2013 Article en page(s) : pp. 622–632 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Plate  heat  exchanger;  Modeling;  Boiling;  Ammonia;  R22;  Water Résumé : A new model has been developed for the analysis of plate heat exchangers with multi-fluid, multi-stream and multi-pass configurations. The model divides the entire heat exchanger into multiple slices in the direction of fluid flow. For the channels in each slice, the wall temperatures are assumed to be constant such that each channel can be solved without the need of knowing the fluid condition in the adjacent channels. In the top level, all the slices are iterated using a successive substitution approach. The model is capable of handling both single-phase and two-phase flow. In general, plate heat exchangers are used with two to three fluids, but the model is capable of handling more than three fluids wherein each fluid can undergo phase change. The model was verified against the P-NTU closed form expressions for single-phase flow in plate heat exchangers with various flow configurations. The model was validated against in-house experimental data for single-phase water, two-phase ammonia and R22 boiling. The effect of discretization and the speed up on multiple cores was investigated. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003283 [article] A new model for plate heat exchangers with generalized flow configurations and phase change = Nouveau modèle d’échangeur à plaques intégrant des configurations d’écoulement généralisées et des changements de phase [texte imprimé] / Hongtao Qiao, Auteur ; Vikrant Aute, Auteur ; Hoseong Lee, Auteur . - 2013 . - pp. 622–632. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 2 (N° spécial) (Mars 2013) . - pp. 622–632 Mots-clés : Plate  heat  exchanger;  Modeling;  Boiling;  Ammonia;  R22;  Water Résumé : A new model has been developed for the analysis of plate heat exchangers with multi-fluid, multi-stream and multi-pass configurations. The model divides the entire heat exchanger into multiple slices in the direction of fluid flow. For the channels in each slice, the wall temperatures are assumed to be constant such that each channel can be solved without the need of knowing the fluid condition in the adjacent channels. In the top level, all the slices are iterated using a successive substitution approach. The model is capable of handling both single-phase and two-phase flow. In general, plate heat exchangers are used with two to three fluids, but the model is capable of handling more than three fluids wherein each fluid can undergo phase change. The model was verified against the P-NTU closed form expressions for single-phase flow in plate heat exchangers with various flow configurations. The model was validated against in-house experimental data for single-phase water, two-phase ammonia and R22 boiling. The effect of discretization and the speed up on multiple cores was investigated. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003283

Simulation of air-to-refrigerant fin-and-tube heat exchanger with CFD-based air propagation / Varun Singh 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. 1883–1897 Titre : Simulation of air-to-refrigerant fin-and-tube heat exchanger with CFD-based air propagation Titre original : Simulation d'un échangeur de chaleur air-frigorigène à tubes ailetés à l'aide de la propagation d'air et de la mécanique numérique des fluides Type de document : texte imprimé Auteurs : Varun Singh, Auteur ; Omar Abdelaziz, Auteur ; Vikrant Aute, Auteur Année de publication : 2012 Article en page(s) : pp. 1883–1897 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Heat  exchanger  Condenser  Modeling  Finned  tube  CFD  Hybrid  Simulation Résumé : A new model for simulating air-to-refrigerant fin-and-tube heat exchangers with computational fluid dynamics (CFD)-based air propagation is introduced. This model is based on a segment-by-segment approach and is developed to be a general purpose and flexible simulation tool. The model superimposes a CFD mesh on the heat exchanger model’s geometric grid, interprets the CFD results, and processes them to generate the air propagation path through the heat exchanger. The model is capable of accounting for air flow maldistribution and other complex flow patterns including recirculation zones within the heat exchanger, as well as, entrainment of exit flow into the heat exchanger, using both two-dimensional (2D) and three-dimensional (3D) CFD results. The modeling results show that the overall predicted heat load using 3D-CFD simulation results agrees within ±4% of the experimental data, without employing any multipliers on air side correlations. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711001812 [article] Simulation of air-to-refrigerant fin-and-tube heat exchanger with CFD-based air propagation = Simulation d'un échangeur de chaleur air-frigorigène à tubes ailetés à l'aide de la propagation d'air et de la mécanique numérique des fluides [texte imprimé] / Varun Singh, Auteur ; Omar Abdelaziz, Auteur ; Vikrant Aute, Auteur . - 2012 . - pp. 1883–1897. Génie mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 8 (Décembre 2011) . - pp. 1883–1897 Mots-clés : Heat  exchanger  Condenser  Modeling  Finned  tube  CFD  Hybrid  Simulation Résumé : A new model for simulating air-to-refrigerant fin-and-tube heat exchangers with computational fluid dynamics (CFD)-based air propagation is introduced. This model is based on a segment-by-segment approach and is developed to be a general purpose and flexible simulation tool. The model superimposes a CFD mesh on the heat exchanger model’s geometric grid, interprets the CFD results, and processes them to generate the air propagation path through the heat exchanger. The model is capable of accounting for air flow maldistribution and other complex flow patterns including recirculation zones within the heat exchanger, as well as, entrainment of exit flow into the heat exchanger, using both two-dimensional (2D) and three-dimensional (3D) CFD results. The modeling results show that the overall predicted heat load using 3D-CFD simulation results agrees within ±4% of the experimental data, without employing any multipliers on air side correlations. ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711001812