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Multi-Stream Multiphase Flow Plate Fin Heat Exchanger Design Optimization to Reduce Pressure Drop and Improve Efficiency

Afrasiabi, Mohammad Hassan | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55867 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Afshin, Hossein
  7. Abstract:
  8. Optimization of Plate-Fin Heat Exchnagers, which have various applications in different cryogenic processes nowadays, can have a significant role in improving process efficiency as well as decreasing their capital and operationl costs. In this study, is introduced a procedure to optimize the performance of multi-stream multi-phase Plate-Fin Heat Exchangers, implementing Genetic Algorithm optimization method. In this study, the simulation of the multi-stream multi-phase Plate-Fin Heat Exchanger is carried out by Aspen EDR, a leading software in simulation and design of different types of heat exchangers. The software is then integrated to external software to automate the simulation procedure and implement the optimization method. In this study, a five-stream multi-phase Plate-Fin Heat Exchanger, used in an Liquified Natural Gas production cycle, is introduced and its fin structure and width is optimized to increase liquefaction rate and decrease pressure drop in the heat exchanger. The results of the optimization for liquefaction rate, shows that the optimized exchanger, has a larger liquefaction rate by 7.6% with almost 100% more energy loss due to pressure drop in the heat excahgner, compared to the base design. The optimization of heat exchanger for pressure drop, shows a 64.7% drop in energy loss due to pressure drop in the heat exchanger, and a slight increase in liquefaction rate. The optimization of the heat exchanger, with an objective function combining the effects of pressure drop and liquefaction rate shows that the energy loss due to pressure drop in the heat excahgner decreases by 62.3% and the liquefaction rate increases by 3.7%
  9. Keywords:
  10. Multidisciplinary Optimization ; Improved Genetic Algorithm ; Cryogenic Treatment ; Plate-Fine Heat Exchange ; Multi Stream Heat Exchanger (MHEX) ; Heat Exchangers ; Multi-Phase Heat Exchangers

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