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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 52566 (06)
- University: Sharif University of Technology
- Department: Chemical and Petroleum Engineering
- Advisor(s): Farhadi, Fathollah; Bozorgmehri Boozargomehri, Ramin
- Abstract:
- The sun, as the world's largest source of energy, had always affected various aspects of human life. Several studies on the use of solar energy in various forms have been reported. Parabolic trough solar collectors are one of the most common ways to use solar thermal energy. Many investigations have been carried out on the study of various parameters of this system and their effect on the efficiency. In this study, a detailed numerical study on the impact of thermo-physical properties of the heat transfer fluid on the system efficiency have been performed and the fluid have been optimized. Parabolic trough solar collector is modelled by dividing the structure of the device into three layers: tube (absorber), glass, and heat transfer fluid, together with the expression of the thermal equations for each layer. A PI controller is also included in the system of equations to keep constant the output fluid temperature, while changing the inlet fluid rate to the collector. In this work, fluid flow modeling and its thermo-physical properties calculation have been done in two ways: 1- Calculation of liquid fluid properties using three specific properties of hydrocarbon fluids (petroleum cut) 2- Computer-aided molecular design, using group contribution method. The optimization of the system is performed on the objective function based on the system efficiency (with the weighting impact of some constraints) using the evolutionary genetic algorithm. The constraints applied to the fluid optimizer include three categories: 1- molecular structure constraints (molecular design only), 2- process constraints, and 3- safety constraints. The optimization results show that using optimal petroleum cut as the Heat Transfer Fluid in the Parabolic Trough Collector can increase thermal efficiency about 0.3%, also using the optimal molecular structure can increase it about 0.5%
- Keywords:
- Group Contribution ; Parabolic Through Collector ; Oil Fractions ; Genetic Evolutionary Algorithm ; Heat Transfer Fluid ; Computer Aided Molecular Design
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