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Problem $09\mathrm{.}023-$ Mass Flow and Exergy

A geothermal power plant uses geothermal liquid water at $150C$ at a rate of $250\mathrm{.}0k\frac{g}{s}$ as the heat source, and it produces $5\mathrm{.}1$ MW of net power in environmental water at $25C.$ Exergy destruction within the geothermal power plant is $7\mathrm{.}5$ MW$.$

A$.$ Determine the exergy of the geothermal water entering the plant. Use steam tables.

B$.$ Determine the second law efficiency.

C$.$ Determine the exergy of the heat rejected from the plant.