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

Thermal and hydraulic performance of sinusoidal corrugated plate heat exchanger for low temperature lift heat pump / Hoseong Lee in International journal of refrigeration, Vol. 36 N° 3 (Mai 2013) 

Public ISBD [article]  in International journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 689–700 Titre : Thermal and hydraulic performance of sinusoidal corrugated plate heat exchanger for low temperature lift heat pump Titre original : Performance thermique et hydraulique de l'un échangeur à plaques sinusoïdal d'une pompe à chaleur à faible élévation de température Type de document : texte imprimé Auteurs : Hoseong Lee, Auteur ; Yunho Hwang, Auteur ; Reinhard Radermacher, Auteur Année de publication : 2013 Article en page(s) : pp. 689–700 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Low  temperature  lift;  Heat  pump;  Plate  heat  exchanger;  Corrugated Résumé : Thermal and hydraulic performance of a sinusoidal corrugated plate heat exchanger (PHX) was investigated for the application of a low temperature lift heat pump (LTLHP), which requires unique operating conditions. The water-side heat transfer coefficient and pressure drop of the PHX were obtained through the experimental test. The refrigerant-side heat transfer performance was investigated by varying several parameters. The PHX performance was poor due to low refrigerant mass flux. The PHX needs better balance in two fluids for the LTLHP application. From the current study, it is concluded that the conventional PHX applied for the LTLHP application is limited by two main factors: a large pressure drop on the water-side due to corrugated shape, and a low heat transfer performance due to the low refrigerant-side heat transfer performance. In order to address these drawbacks, heat exchanger designs must be improved by optimizing its geometry and flow area asymmetrically for each fluid. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003076 [article] Thermal and hydraulic performance of sinusoidal corrugated plate heat exchanger for low temperature lift heat pump = Performance thermique et hydraulique de l'un échangeur à plaques sinusoïdal d'une pompe à chaleur à faible élévation de température [texte imprimé] / Hoseong Lee, Auteur ; Yunho Hwang, Auteur ; Reinhard Radermacher, Auteur . - 2013 . - pp. 689–700. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 689–700 Mots-clés : Low  temperature  lift;  Heat  pump;  Plate  heat  exchanger;  Corrugated Résumé : Thermal and hydraulic performance of a sinusoidal corrugated plate heat exchanger (PHX) was investigated for the application of a low temperature lift heat pump (LTLHP), which requires unique operating conditions. The water-side heat transfer coefficient and pressure drop of the PHX were obtained through the experimental test. The refrigerant-side heat transfer performance was investigated by varying several parameters. The PHX performance was poor due to low refrigerant mass flux. The PHX needs better balance in two fluids for the LTLHP application. From the current study, it is concluded that the conventional PHX applied for the LTLHP application is limited by two main factors: a large pressure drop on the water-side due to corrugated shape, and a low heat transfer performance due to the low refrigerant-side heat transfer performance. In order to address these drawbacks, heat exchanger designs must be improved by optimizing its geometry and flow area asymmetrically for each fluid. En ligne : http://www.sciencedirect.com/science/article/pii/S0140700712003076