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liquefaction-cycles
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An Economic Approach To Study & Optimization of Helium liquefier
, M.Sc. Thesis Sharif University of Technology ; Afshin, Hossein (Supervisor)
Abstract
Gas liquefaction is one of the main applications of Cryogenics science. Due to the unique properties of Helium, it is a strategic product in the world. Therefore, appropriate and applicable analysis should be used to investigate and optimize the Helium liquefaction cycles. In the current study, the goal is to find the optimal point with the help of energy and exergy analysis based on economic criterion, for the various parameters of Collins’ cycle. In order to simulate the cycle, a computer code is developed. First, sensitivity analysis of different parameters affecting the exergy efficiency and liquid fraction of the cycle has been done. Then, Artificial Neural Network and Genetic Algorithm...
Investigation of Mixed Refrigerant Behavior in Multistream Plate-Fin Heat Exchangers
, M.Sc. Thesis Sharif University of Technology ; Saeedi, Mohammad Hassan (Supervisor) ; Kazemzadeh Hannani, Siamak (Supervisor)
Abstract
Multistream plate-fin heat exchangers are used to supply the energy required by process units in the oil and gas industry. improving their performance is very important to reduce operating costs. In many applications, mixed refrigerants have replaced to improve the performance of plate-fin heat ecxhangers; Because the greater adaptability of the mixed refrigerant to the required refrigeration conditions that reduces the exergy losses. The Prico liquefaction cycle is one of the most commercial and commonly used liquefaction cycles. One of the most important parameters in designing a Prico liquefaction cycle is the molar percentage of the mixed refrigerant components. Proper determination of...