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Exergy and Thermoeconomic Analysis of Hybrid Desalination Unit (RO+MED) Coupled with a Combined Cycle Power Plant (Case study: Mapna standard design for Combined Cycle Power Plants)

Karbalaei Mirza, Fatemeh | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52330 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saeedi, Mohammad Hassan; Abbaspor, Majid
  7. Abstract:
  8. In recent years, providing sustainable water supplies in dry and low water areas in the south of country is one of the important problems in the country. In addition to advantages of using cogeneration systems (power plant and desalination unit), using hybrid technologies causes productivity and reduction in energy consumption and water supplies. The target of this thesis is studying different thermal coupling scenarios to find optimum and constraint design in specific conditions in terms of cost and production. So in this conceptual study, by using thermoflow software, the hybrid unit coupled with a back pressure and condensing combined cycle power plant was studied based on thermodynamic and exeregetic analysis. The results suggest that because of the presence of condenser in a condensing combined cycle power plant, the flow of inlet steam to the thermal desalination unit is significantly reduced and thus the amount of desalinated water will be decreased about four times. Finally, in order to perform economic analysis, LCOE and LCOW methods were used to calculate the cost of desalinated water and power. Final cost of desalinated water and power in back pressure scenario is respectively 1.24 $ per cubic meters and 0.086 $ per kWh and in condensing scenario is respectively 0.87 $ per cubic meters and 0.079 $ per kWh. Also by using sensitivity analysis, which is one of the effective methods in evaluating thermodynamic systems, the impact of changes in key input variables such as fuel price, gas price, investment cost and production capacity on important output variables such as water and power cost was examined. Finally, the changes of design variables in power generation and desalination unit and their effect on exergetic efficiency were investigated
  9. Keywords:
  10. Cogeneration ; Hybrid Desalination ; Exergy Analysis ; Economic Analysis ; Thermodynamic Study ; Thermoeconomic Analysis

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