The schematic diagram of a cogeneration system providing both power and steam is shown in the figure below. You need to use these assumptions to develop the exergy analysis of the cogeneration system: (1) The cogeneration system operates at steady state. The effects of motion and gravity at the numbered states can be ignored. (2) All system components operate adiabatically. (3) Air enters the compressor at 25C, 1 atm. These values correspond to the temperature and pressure of the exergy reference environment of Table A-26 (Model II- Moran), which is assumed. The molar analysis of the air is 79% N2; 21% O2 . (4) Natural gas, regarded to be methane modeled as an ideal gas, is injected into the combustor at 25C, 12 bar. Combustion with excess air is complete. The combustion products form an ideal gas mixture. The pressure drop through the combustor is 5%. (5) For the regenerator there is a 5% pressure drop on the air side and a 3% pressure drop on the combustion product side. Preheated compressed air exits the regenerator at 750 K. (6) For the heat-recovery steam generator, feedwater enters at 25C, 20 bar and saturated vapor exits at 20 bar with a mass flow rate of 7 kg/s. A pressure drop of 5% occurs on the combustion product side and the combustion products exit at 1 atm. (7) The compressor pressure ratio is 10. The isentropic compressor and turbine efficiencies are each 85%. The temperature at the turbine inlet is 1560 K. The mass flow rate of fuel is 1.75 kg/s. Required: (a) Energy analysis of the system (b) Exergy analysis of the system. (c)Cost analysis of the system.

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Process steam: Table 1: The properties of each state for the cogeneration system