Exergetic and economic optimization of a solar-based cogeneration system applicable for desalination and power productio
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Exergetic and economic optimization of a solar‑based cogeneration system applicable for desalination and power production Ramin Ghasemiasl1 · Mohammad Amin Javadi1 · Morteza Nezamabadi2 · Mohsen Sharifpur3,4 Received: 11 June 2020 / Accepted: 12 September 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract In this research, the optimum situation for the function of a combined cycle power plant (CCPP) which simultaneously generates water and electricity with parabolic solar collectors has been scrutinized. The CCPP includes two gas cycles and one steam cycle in which a multi-stage vapor desalination and a parabolic solar collector have been added. In this stage, first, the thermodynamic cycle of the CCPP has been modeled, and values of exergy and energy in each flow line and the power plant component were determined. Finally, exergy destruction in each section is calculated. For a better assessment of the system, an economic analysis of power plant is performed by using SPECO method. The results revealed that as the number of desalination effect increased from 4 to 8 and the exergy efficiency decreased from 52.7 to 52.4%. Moreover, there was an increase in the cost of electricity generation by 12%, and the interest rate of freshwater production increased from 6 to 12 due to the increase in the number of effects. The power plant optimization results show that the exergy efficiency increases to 53.62%, which indicates a growth of 1.74%. Keywords Combined cycle · Cogeneration power plant · Desalination · Exergy destruction · Environmental effect · Exergy efficiency · Solar collector List of symbols c Cost per exergy unit ($ (MJ)−1) cf Cost of fuel per energy unit ($ (MJ)−1) Ċ Cost flow rate ($ s−1) cp Specific heat at constant pressure (kJ kg−1 K−1) CRF Capital recovery factor ̇ Exergy flow rate (MW) Ex ̇ D Exergy destruction rate (MW) Ex ex Specific exergy (kJ kg−1) i Annual interest rate (%) * Mohammad Amin Javadi [email protected] * Mohsen Sharifpur [email protected]; [email protected] 1
Department of Mechanical Engineering, West Tehran Branch, Islamic Azad University, Tehran, Iran
2
Department of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
3
Department of Mechanical and Aeronautical Engineering, University of Pretoria, Pretoria, South Africa
4
Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam
h Specific enthalpy (kJ kg−1) h0 Specific enthalpy at environmental state (kJ kg−1) LHV Lower heating value (kJ kg−1) ṁ Mass flow rate (kg s−1) n Number of years N Number of hours of plant operation per year PP Pinch point Q̇ Heat transfer rate (kW) rAC Compressor pressure ratio s Specific entropy (kJ kg−1 K−1) s0 Specific entropy at environmental state (kJ kg−1 K−1) ̇ Wnet Net power output (MW) Z Capital cost of a component ($) Ż Capital cost rate ($ s−1) Greek letters 𝜂 Isentropic efficiency 𝜉 Coefficient of fuel chemical exergy 𝛷 Maintenance factor Subscripts a Air AC Air compr
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