Determine the first-law thermal efficiency and compare it to that of a Carnot cycle operating between the same temperature extremes.

An engineer proposes to eliminate the condenser in an ideal Rankine cycle to form an open cycle. Lake water is available at 16°C. The lake water is pumped to 5 MPa and then heated at constant pressure to 400°C. The “spent” steam is rejected back into the lake. Determine the first-law thermal efficiency of this process and compare it with that of Problem 8.8. What are some of the practical problems with this proposed cycle?

Problem 8.8

In a Rankine cycle, steam leaves the boiler at 400°C and 5 MPa. The condenser pressure is 0.01 MPa. The water entering the pump is saturated. Determine the first-law thermal efficiency and compare it to that of a Carnot cycle operating between the same temperature extremes.

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