Find the exergy of the water at all four states in the Rankine cycle described in Problem 9.16. Assume that the high-temperature source is 500?C and the low-temperature reservoir is at the ambient 25?C. Determine the flow of exergy into or out of the reservoirs per kilogram of steam flowing in the cycle. What is the overall cycle second-law efficiency?
Problem 9.16
A utility runs a Rankine cycle with a water boiler at 3.0 MPa, and the cycle has the highest and lowest temperatures of 450?C and 60?C, respectively. Find the plant efficiency and the efficiency of a Carnot cycle with the same temperatures.