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Design, Optimization and Numerial Simulation of ASU Multi Stream Plate Fin Heat Exchenger

Hosseinabad, Reza | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57795 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Afshin, Hossein; Sheikhi, Aras
  7. Abstract:
  8. One of the most important process equipments in cryogenic industries that include air separation and liquifed natural gas processes, are their heat exchangers that are the plate and fin type. In this study the aim is to develop a code in MATLAB software to thermal design and numerial simulation of a multi stream plate fin heat exchanger that is in a cryogenic air separation cycle. In design mode, an ASU multi stream plate fin exchanger that its duty is to cool down and condense air is designed by wall temperature determination method and GA. Then in layer by layer simulation the optimum periodic layer pattern is defined by developed code. With the optimum layer pattern the wall temperature non uniformity parameter is 5.48K. The Developed code in layer by layer simulation mode is validated with Aspen EDR and the maximum difference between results of code and EDR is 7K. The superiority of code Due to the linking the developed code easily to the optimizers such as optimizers in MATLAB and Python is proved. After all by CFD simulation of standard header the flow distribution is defined and the exchanger is simulated with non uniform flow distribution, the effect of the standard header is that flow maldistribution in header raised the wall temperature non uniformity to 11.5K. By CFD simulation and modification of the header geometry, the non uniformity of flow in header is decreased 75, 70, 86 and 83 for header of oxygen, nitrogen, medium pressure and high pressure air. The effect of header modification is that the wall temperature non uniformity decreased from 11.5K to 5.9K that causes reduceing thermal stresses due to the wall temperature non uniformity
  9. Keywords:
  10. Genetic Algorithm ; Cryogenic ; Multi Stream Heat Exchanger (MHEX) ; Plate Fin Heat Exchanger ; Cryogenic Treatment ; Header Maldistribution ; Air Separation

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