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physics_geek

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## Homework Statement

An electric generating station is designed to have an electric output power 1.20 MW using a turbine with two-thirds the efficiency of a Carnot engine. The exhaust energy is transferred by heat into a cooling tower at 98°C.

(a) Find the rate at which the station exhausts energy by heat, as a function of the fuel combustion temperature Th.

---MW

If the firebox is modified to run hotter by using more advanced combustion technology, how does the amount of energy exhaust change?

(b) Find the exhaust power for Th = 838°C.

-----MW

(c) Find the value of Th for which the exhaust power would be only half as large as in part (b).

----- K

(d) Explain why no value for Th would give an exhaust power one quarter as large as in part (b).

## Homework Equations

P=W/t

e= 1-Tc/Th

## The Attempt at a Solution

i have no idea where to start..all i know is that the outpot power = 1.40MW and that Tc is 110 C??..what do i do with this info..please help