An engineer brings you a basic design for a steam power plant. The heat is input to the plant from a source at 500oC, and heat is rejected to cooling water at 20oC. The power plant is to produce 250 MW of power while receiving heat at a rate of 700 MW. Is this process possible?
Given: Proposed: TH = 500oC = 773 K; TC = 20oC = 293 K; Q?H=700 MW; W?=250 MW
Compare the actual proposed efficiency to the Carnot efficiency for the heat engine:
nproposed = W?/Q?H = 0.357
nmax = 1 – TC/TH = 1 – (293 K/773 K) = 0.621
As nmax > nproposed, the process is possible.
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