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At a coal-burning power plant a steam turbine is operated
Chapter 18, Problem 49P(choose chapter or problem)
Problem 49P
At a coal-burning power plant a steam turbine is operated with a power output of 548 MW. The thermal efficiency of the power plant is 32.0%. (a) At what rate is heat discarded to the environment by this power plant? (b) At what rate must heat be supplied to the power plant by burning coal?
Questions & Answers
QUESTION:
Problem 49P
At a coal-burning power plant a steam turbine is operated with a power output of 548 MW. The thermal efficiency of the power plant is 32.0%. (a) At what rate is heat discarded to the environment by this power plant? (b) At what rate must heat be supplied to the power plant by burning coal?
ANSWER:
Step 1 of 3
Here, we have to calculate the heat dissipated at the cold reservoir and the amount of heat withdrawn from the hot reservoir.
The equation for the efficiency of the heat engine,
-------------- (1)
Where, - Work done by the system
- Heat withdrawn from the hot reservoir
The work done by the heat engine,
Where, - Heat dissipated at the cold reservoir
a)