PDF Publication Title:
Text from PDF Page: 170
Chapter 7. Conclusions and Future Research Directions 7.3.2 Enhancing Computational Efficiency of PSA Opti- mization Due to PSA inherent feature of achieving only a CSS, detailed and computa- tionally challenging, dynamic optimization procedures has to be used for design purposes in this study. This is in sharp contrast to other dynamic processes, where at steady state the time derivatives approaches zero and steady state op- timization can be effectively employed without the need of calculating the CPU intensive, model sensitivities with respect to the decision variables through out the time horizon of operation. Dynamic optimization studies performed in Chap- ter 5 (see Table 5.10), shows that more than half of the CPU time is spent in the sensitivity calculations. It is important to note that for the optimization studies where no time variant decision variables are involved, which is usually the case for most PSA optimization problems, the objective function and constraints sensitivities with respect to time invariant decision variables are only required at the final time of the operation. Therefore, a possible way to accelerate the PSA optimization procedure is to calculate the sensitivity information only at the end (CSS) or towards the end. Furthermore, bypassing the sensitivities for most part of the time horizon would significantly enhance the robustness of the numerical optimization procedures, without compromising its rigorousness. 7.3.3 Simultaneous Design and Control of Process System With Model Based Controllers In past, only few studies have incorporated a model based control such as MPC [25, 139] in the simultaneous design and control optimization framework. The controller moves in this case are obtained by solving an optimization problem, which poses further challenges to the solution of overall optimization formulation. 170PDF Image | Operation and Control of Pressure Swing Adsorption Systems
PDF Search Title:
Operation and Control of Pressure Swing Adsorption SystemsOriginal File Name Searched:
Khajuria-H-2011-PhD-Thesis.pdfDIY PDF Search: Google It | Yahoo | Bing
CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
Heat Pumps CO2 ORC Heat Pump System Platform More Info
| CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com | RSS | AMP |