On July 29, 1949, the first gas turbine installed in the United States for generating electric power went into service at the Belle Isle station of the Oklahoma Gas and Electric Company.15 It had a 15-stage compressor with an isentropic pressure ratio of 6 to 1, a 2-stage turbine with overall entrance and exit temperatures of 1400°F and 780°F, respectively, and the turbine-generator unit was rated at 3500 kW. Assuming a Brayton cold ASC, determine
a. The isentropic efficiency of the turbine.
b. The Brayton cold ASC thermal efficiency of the entire turbine-compressor unit.