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Thermo – Economic Investigation Of A Multi-Generation System Based On Solar And Geothermal Energies Considering Emission Reduction And Relying On Maximum Utilization Of Renewable Energies

Badri, Mohammad | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56467 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saeedi, Mohammad Hassan
  7. Abstract:
  8. In this research, a multigeneration system was designed and evaluated, utilizing solar and geothermal energy to generate electricity, fresh water, hydrogen, and oxygen. The system's performance was assessed from energy, exergy, and economic perspectives. The setup involves a solar tower contributing energy to the gas cycle and a geothermal well supplying preheated water for the steam cycle. The system employs a molten salt cycle to capture heat from the solar receiver, transferring it to the air cycle. The remaining energy requirement is met by the Air Brayton cycle, which combines methane and hydrogen as fuels within the combustion chamber. Additionally, a steam cycle is integrated to harness residual heat from the gas turbine's outlet. Here, water from the geothermal well serves as the working fluid. For freshwater production, a multi-stage evaporative water desalination process is incorporated. To generate hydrogen and oxygen gas, a proton exchange membrane (PEM) electrolyzer unit is employed. The research findings indicate that, under optimal conditions, the system achieves an energy efficiency of 13.31 and exergy efficiency of 13.95%, operating at a cost rate of $0.1365 per second. Notably, it yields 11.574 kg/s of fresh water, 0.01531 kg/s of hydrogen, and 0.1224 kg/s of oxygen. In this scenario, around 39.36% of generated hydrogen is stored, while the remainder is utilized as clean fuel. In dynamic simulations, the heliostat field was observed to receive 5324.9 MWh of energy and deliver 3333.9 MWh to the receiver during peak radiation in a month. Moreover, the receiver efficiently absorbed 2847.7 MWh of usable energy within the same period
  9. Keywords:
  10. Energy ; Solar Tower ; Geothermal Energy ; Electrolysis ; Renewable Energy Resources ; Exergoeconomics ; Mitigation ; Multigeneration

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