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8-16 A combined cycle of the type shown in Fig. 1 (b) uses helium in the gas turbine portion. The compressor and turbine have the same pressure ratio of 2.0, the same polytropic efficiencies of 0.88 , and inlets at 160 and 2000F, respectively. The regenerator effectiveness is 0.88 . The steam cycle operates with 1000 psia and 1000F steam and condenses at 1 psia. The steam turbine polytropic efficiency is 0.80 . The feedwater heater has a terminal temperature difference of 28F. Calculate (a) the helium mass flow rate, in pound mass per hour, for a combined output of 220MW, and (b) the gas, steam, and combined cycle efficiencies. Ignore the steam cycle pump work