Question: a . What is the exergy transfer by an amount of heat ( mathrm { Q } = 2 7 0 mathrm

a. What is the exergy transfer by an amount of heat \(\mathrm{Q}=270\mathrm{~kJ}\) at 680 K ? Assume the environment to be at 300 K .
b. A heat engine that receives heat from a furnace at \(980^{\circ}\mathrm{C}\) and rejects waste heat to a river at \(5^{\circ}\mathrm{C}\) has a thermal efficiency of 35 percent. Determine the second-law efficiency of this heat engine.
c. One kilogram of steam is throttled from 10 MPa and \(700^{\circ}\mathrm{C}\) to a pressure of 5 MPa . Determine the decrease in exergy of the steam during this process. Assume the surroundings to be at \(25^{\circ}\mathrm{C}\).
a . What is the exergy transfer by an amount of

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