A steam turbine having an isentropic turbine efficiency of 90% drives an air compressor having an isentropic compressor efficiency of 85%. Steady-state operating data are provided on the figure. Assume the ideal gas model for air, and ignore stray heat transfer and kinetic and potential energy effects. (a) Determine the mass flow rate of the steam entering the turbine, in kg of steam per kg of air exiting the compressor. (b) Repeat part (a) if ?t = ?c = 100 %.

Steam 1 P = 2 MPa T = 440C P4 = 496 kPa Turbine Compressor nt = 90%- -nc = 85% P2 = 100 kPa 2+ 3+1 Air T3 = 27C, P3 = 110 kPa