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Parametric Study and Numerical Simulation of Spiral Wound Heat Exchanger Performance at Cryogenic Temperatures

Hosseinian Khorasgani, Mohsen | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51156 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Afshin, Hossein
  7. Abstract:
  8. Cryogenic is the study of physical phenomena at temperatures below 123 Kelvin. One of the applications of cryogenic science is the liquefaction of gases. In the liquefaction cycles of gases, such as helium liquefaction, fluidization occurs in the pressure reducing valve but temperature of the gas should be greatly reduced before it enters the pressure reducing valve. For this purpose, high-performance heat exchangers should be used. Spiral Wound is one of the heat exchangers that has ability to achieve over 90% efficiency due to its structure. Researchs in the field of design and simulation of spiral heat exchangers are limited and are done with a lot of simple assumptions such as constant properties, no heat exchange with ambient and etc. Also very little research has been done to find the best geometry for the heat exchanger and the researchers have only studied the effect of some geometric parameters on the performance of the spiral heat exchanger so there is little researchs to find the best geometric parameters. The purpose of this project is to investigate the performance of Spiral Wound heat exchangers in different sizes and dimensions and to find out the effect of important geometric parameters on its performance. In this study, Spiral Wound heat exchanger is considered with constraint geometry and helium working fluid then relationships are presented to examine the heat transfer and pressure drop in the shell-side flow of this heat exchanger that the mean error for Nusselt number and pressure drop coefficient are 4.5% and 7% respectively. Also, by developing an analytical code in MATLAB, a method is proposed to determine the performance and design of this type of heat exchanger in the case that the properties of the working fluid change with temperature. The average error of the calculation of the efficiency of the heat exchanger by this method is 3%. Finally, by choosing the economic benchmark, the best geometry is selected for the specific function that is expected from the heat exchanger
  9. Keywords:
  10. Cryogenic ; Liquefaction ; Heat Exchangers ; Optimization ; Spiral Heat Exchanger

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