Using Exergetic Efficiencies Figure P7.132 shows a cogeneration system produci...

Using Exergetic Efficiencies

Figure P7.132 shows a cogeneration system producing two useful products: net power and process steam. The accompanying table provides steady-state mass flow rate, temperature, pressure, and flow exergy data at the ten numbered states on the figure. Stray heat transfer and the effects of motion and gravity can be ignored. Let T₀ = 298.15 K, p₀ = 1.013 bar. Determine, in MW

(a) the net rate exergy is carried out with the process steam, f82.

(b) the net rate exergy is carried out with the combustion products,

(c) the rates of exergy destruction in the air preheater, heatrecovery steam generator, and the combustion chamber.

Devise and evaluate an exergetic efficiency for the overall cogeneration system.