Gas turbine exhaust enters the heat-recovery steam generator (HRSG) of a GTCC plant at 550 C, 1.15 bar and leaves at 150 C, 1.05 bar. Liquid water enters the HRSG at 90 C, 200 bar, and leaves as superheated steam at 500 C, 200 bar.
a. The stream availability of the gas turbine exhaust at entry to the HRSG.
b. The stream availability of the water at exit from the HRSG.
c. The ratio of gas mass flow rate to water mass flow rate.
Calculate the stream availability of superheated steam at a pressure of 10 bar and a temperature of 250 C.