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Exergy and Thermoeconomic Analysis of a Hybrid System of Desalination and CCHP, Augmented by Solar Energy

Saraei, Alireza | 2014

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 46293 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Abbaspour Tehrani Fard, Majid
  7. Abstract:
  8. The demand in water and energy for household, industrial and agricultural uses continue to grow. In recent years, many researches have been done on thermodynamic assessment and optimization of Combined Cooling, Heating and Power (CCHP) and desalination systems. The interesting and important point is the potential of combining CCHP and desalination systems by employing the solar power. The purpose of this study is exergy analysis and thermoeconomic optimization of a hybrid system of Multi-Effects Distillation desalination (MED) and CCHP, augmented by solar energy. The thermoeconomic analysis is carried out by Total Revenue Requirement (TRR) method. Properties of working fluid in hybrid MED and CCHP system are obtained by determining the system processes and governing equations, then thermodynamic, exergy and thermoeconomic analyses are performed. At the first step, just economic minimization of system cost is carried out by identification of decision variables. Then the optimized results of the first and second law efficiencies as well as the optimized thermoeconomic results would be presented. In this thesis, the genetic algorithm technique is implemented for optimization and for multi-objective optimization the Pareto optimal solution is provided. The procedure for selecting the best solution is also discussed. The results show that along a particular vector of decision parameters, the objective functions consist of the first and second law efficiency and cost of system product would be optimized, simultaneously. At the optimized condition, the price of freshwater from the boiler output steam would be 1.1315 $/m3, from the solar collector output steam would be 1.318 $/m3 and from CCHP output steam would be 1.087 $/m3. The hybridization of desalination system with CCHP system would lead to 4% reduction and the hybridization of desalination system with solar steam generator would lead to 16% increase in prices of freshwater
  9. Keywords:
  10. Multiobjective Optimization ; Solar Energy ; Exergy Analysis ; Desalination ; Combine Cooling Heating and Power (CCHP) ; Thermoeconomic Analysis

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