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Optimal Design of Cryogenic Heat Exchanger for Gas Liquefication Cycle

Ebrahimi Ghalinghieh, Hamed | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49317 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Afshin, Hossein
  7. Abstract:
  8. Gas liquefication in low temperatures is one of the most challenging fields in engineering due to complexity of its thermodynamic analisys and fabrication of equipments. Heat Exchangers are one of the most important equipments in these prosseces. High prices of Heat Exchangers in these facilities makes their Optimal and cost effective design, of crucial importance. In this thesis three dimensional model of a Plate Fin Heat Exchanger is thoroughly investigated. Fistly, by means of Aspen Heat Exchanger design Software a counter flow Heat Exchanger is designed. This HX is to be placed in Collins cycle, so, working fluid in both hot and cold streams is Helium Gas. The HX then by means of ANSYS CFX Software has been simulated. For the Helium Gas properties various functions are developed and compiled in CEL language. To tackle unacceptable difference between simulation and Aspen Software results, a computer code on basis of descritised ϵ–NTU is developed and used. Results show that good coincidence has been aquierd. Additionally using the analitycal solution, the heat exchangeris optimized. To make sure of reliabity of results, the analytically optimized HX is simulated and results are compared. Finally the effect of pressure drop on HX performance is investigated. Results show that in this HX the effect of pressure drop is inconsiderable
  9. Keywords:
  10. Compact Heat Exchanger ; Optimization ; Optimal Design ; Plate-Fine Heat Exchange ; Heat Exchanger Design ; Natural Gas Liquefaction

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