Documents disponibles écrits par cet auteur

Evaporative cooling of water in a rotating packed bed (Split Packing) / Bhattacharya, S. in Industrial & engineering chemistry research, Vol. 49 N° 2 (Janvier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 2 (Janvier 2010) . - pp 847–851 Titre : Evaporative cooling of water in a rotating packed bed (Split Packing) Type de document : texte imprimé Auteurs : Bhattacharya, S., Auteur ; Mondal, A., Auteur ; Bhowal, A., Auteur Année de publication : 2010 Article en page(s) : pp 847–851 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Rotating  packed  bed  Mass-transfer  processes. Résumé : Rotating packed beds (RPB) have been studied for intensifying mass-transfer processes. This work was undertaken to evaluate the thermal performance of an RPB with split packing for evaporative cooling of water involving simultaneous heat and mass transfer. Higher efficiency was achieved within a smaller contactor volume compared to mechanical draft cooling towers. At all values of the liquid-to-air flow rate ratio studied, efficiency was not significantly affected by rotor speed and decreased with increasing rotor speed beyond a certain limit at low air and water flow rates. A simple mathematical model was used to estimate process parameters from the experimental data based on the Merkel assumption. The hGa/kYaCs ratio varied between 0.85 and 1.18, and the tower characteristic of the RPB was between 1.4 and 4.0. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901207m [article] Evaporative cooling of water in a rotating packed bed (Split Packing) [texte imprimé] / Bhattacharya, S., Auteur ; Mondal, A., Auteur ; Bhowal, A., Auteur . - 2010 . - pp 847–851. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 2 (Janvier 2010) . - pp 847–851 Mots-clés : Rotating  packed  bed  Mass-transfer  processes. Résumé : Rotating packed beds (RPB) have been studied for intensifying mass-transfer processes. This work was undertaken to evaluate the thermal performance of an RPB with split packing for evaporative cooling of water involving simultaneous heat and mass transfer. Higher efficiency was achieved within a smaller contactor volume compared to mechanical draft cooling towers. At all values of the liquid-to-air flow rate ratio studied, efficiency was not significantly affected by rotor speed and decreased with increasing rotor speed beyond a certain limit at low air and water flow rates. A simple mathematical model was used to estimate process parameters from the experimental data based on the Merkel assumption. The hGa/kYaCs ratio varied between 0.85 and 1.18, and the tower characteristic of the RPB was between 1.4 and 4.0. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901207m

Optimal control of battery energy storage for wind farm dispatching / Teleke, S. in IEEE transactions on energy conversion, Vol. 25, N° 3 (Septembre 2010) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 787 - 794 Titre : Optimal control of battery energy storage for wind farm dispatching Type de document : texte imprimé Auteurs : Teleke, S., Auteur ; Baran, M.E., Auteur ; Bhattacharya, S., Auteur Année de publication : 2011 Article en page(s) : pp. 787 - 794 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Battery  storage  plants;  load  dispatching;  open  loop  systems;  optimal  control;  predictive  control;  wind  power  plants Résumé : Integrating a battery energy storage system (BESS) with a large wind farm can make a wind farm more dispatchable. This paper focuses on development of a control strategy for optimal use of the BESS for this purpose. The paper considers an open-loop optimal control scheme to incorporate the operating constraints of the BESS, such as state of charge limits, charge/discharge current limits, and lifetime. The goal of the control is to have the BESS to provide as much smoothing as possible, so that the wind farm can be dispatched on an hourly basis based on the forecasted wind conditions. The effectiveness of this control strategy has been tested by using an actual wind farm data. Furthermore, a real-time implementation strategy using model predictive control is also proposed. Finally, it is shown that the control strategy is very important in improving the BESS performance for this application. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5432995&sortType%3Das [...] [article] Optimal control of battery energy storage for wind farm dispatching [texte imprimé] / Teleke, S., Auteur ; Baran, M.E., Auteur ; Bhattacharya, S., Auteur . - 2011 . - pp. 787 - 794. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 25, N° 3 (Septembre 2010) . - pp. 787 - 794 Mots-clés : Battery  storage  plants;  load  dispatching;  open  loop  systems;  optimal  control;  predictive  control;  wind  power  plants Résumé : Integrating a battery energy storage system (BESS) with a large wind farm can make a wind farm more dispatchable. This paper focuses on development of a control strategy for optimal use of the BESS for this purpose. The paper considers an open-loop optimal control scheme to incorporate the operating constraints of the BESS, such as state of charge limits, charge/discharge current limits, and lifetime. The goal of the control is to have the BESS to provide as much smoothing as possible, so that the wind farm can be dispatched on an hourly basis based on the forecasted wind conditions. The effectiveness of this control strategy has been tested by using an actual wind farm data. Furthermore, a real-time implementation strategy using model predictive control is also proposed. Finally, it is shown that the control strategy is very important in improving the BESS performance for this application. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5432995&sortType%3Das [...]

Performance evaluation of controlled-capacitor-charging-type inverters / Chakraborty, C. in IEEE transactions on industrial electronics, Vol. 56 N°1 (Janvier 2009) 

Public ISBD [article]  in IEEE transactions on industrial electronics > Vol. 56 N°1 (Janvier 2009) . - pp. 12 - 19 Titre : Performance evaluation of controlled-capacitor-charging-type inverters Type de document : texte imprimé Auteurs : Chakraborty, C., Auteur ; Dalapati, S., Auteur ; Bhattacharya, S., Auteur Année de publication : 2009 Article en page(s) : pp. 12 - 19 Note générale : electronics Langues : Anglais (eng) Mots-clés : invertors;  power  capacitors Résumé : This paper presents the performance of capacitor-charging-type inverters. Both single- and three-phase inverters are considered. A simple technique to design the L -C elements of such an inverter is introduced. The switching devices are operated in the discontinuous conduction mode to reduce the size of the inductor and also for better dynamic performance. The inverter is simulated in PSPICE. An experimental prototype is produced to verify the results from simulation. Experimentations have been conducted for single-phase and three-phase systems. The inverter is found to operate satisfactorily for various types of load including unbalanced load. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4666723&sortType%3Das [...] [article] Performance evaluation of controlled-capacitor-charging-type inverters [texte imprimé] / Chakraborty, C., Auteur ; Dalapati, S., Auteur ; Bhattacharya, S., Auteur . - 2009 . - pp. 12 - 19. electronics Langues : Anglais (eng) in IEEE transactions on industrial electronics > Vol. 56 N°1 (Janvier 2009) . - pp. 12 - 19 Mots-clés : invertors;  power  capacitors Résumé : This paper presents the performance of capacitor-charging-type inverters. Both single- and three-phase inverters are considered. A simple technique to design the L -C elements of such an inverter is introduced. The switching devices are operated in the discontinuous conduction mode to reduce the size of the inductor and also for better dynamic performance. The inverter is simulated in PSPICE. An experimental prototype is produced to verify the results from simulation. Experimentations have been conducted for single-phase and three-phase systems. The inverter is found to operate satisfactorily for various types of load including unbalanced load. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4666723&sortType%3Das [...]

Strength of spot-welded steel sheets in corrosive environment / G. Mukhopadhyay in Materials and corrosion, Vol. 61 N° 5 (Mai 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 5 (Mai 2010) . - pp. 398–406 Titre : Strength of spot-welded steel sheets in corrosive environment Type de document : texte imprimé Auteurs : G. Mukhopadhyay, Auteur ; Bhattacharya, S., Auteur ; K. K. Ray, Auteur Année de publication : 2010 Article en page(s) : pp. 398–406 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : corrosion;  hydrogen  damage;  interstitial  free  steel;  slow  strain  rate  test;  spot-weld Résumé : The load bearing capacity (LBC), often referred to as strength, of spot-welded joints on as-received and pre-strained sheets of an interstitial free (IF) steel has been examined under 3.5% sodium chloride solution using tensile-shear (TS) specimens. These tests have been carried out under three different test conditions: (i) after immersing the samples in the solution for various duration of time, (ii) at various slow strain rates by keeping the samples in solution, and (iii) at slow strain rate under in situ hydrogen charging. Analyses of the results infer that (i) increased duration of immersion of the samples in aggressive environment decreases their LBC but increases their extension corresponding to the maximum load (EML), (ii) slow strain rate tests in the solution indicate marginal decrease of LBC and EML of the spot-welds, (iii) the LBC and EML of the spot-welds of pre-strained sheets decrease considerably with cathodic hydrogen charging while EML of the spot-welded joints on the as-received sheets is found to improve, and finally, (iv) the detrimental effect of corrosive environment increases with increased pre-strain of the investigated sheets. These observations have been discussed together with post-failure examinations of the broken fractured surfaces, which have assisted in understanding their failure mechanism. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905427/abstract [article] Strength of spot-welded steel sheets in corrosive environment [texte imprimé] / G. Mukhopadhyay, Auteur ; Bhattacharya, S., Auteur ; K. K. Ray, Auteur . - 2010 . - pp. 398–406. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 5 (Mai 2010) . - pp. 398–406 Mots-clés : corrosion;  hydrogen  damage;  interstitial  free  steel;  slow  strain  rate  test;  spot-weld Résumé : The load bearing capacity (LBC), often referred to as strength, of spot-welded joints on as-received and pre-strained sheets of an interstitial free (IF) steel has been examined under 3.5% sodium chloride solution using tensile-shear (TS) specimens. These tests have been carried out under three different test conditions: (i) after immersing the samples in the solution for various duration of time, (ii) at various slow strain rates by keeping the samples in solution, and (iii) at slow strain rate under in situ hydrogen charging. Analyses of the results infer that (i) increased duration of immersion of the samples in aggressive environment decreases their LBC but increases their extension corresponding to the maximum load (EML), (ii) slow strain rate tests in the solution indicate marginal decrease of LBC and EML of the spot-welds, (iii) the LBC and EML of the spot-welds of pre-strained sheets decrease considerably with cathodic hydrogen charging while EML of the spot-welded joints on the as-received sheets is found to improve, and finally, (iv) the detrimental effect of corrosive environment increases with increased pre-strain of the investigated sheets. These observations have been discussed together with post-failure examinations of the broken fractured surfaces, which have assisted in understanding their failure mechanism. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905427/abstract