Q 1: Consider a combined gas-steam turbine cycle with both machines ideal. Air enters the compressor at 1 atm and 520°R. 400 percent theoretical air gases enter the gas turbine at 2500°R. The pressure ratio for both the compressor and turbine is 8. No intercooling, reheat, or regeneration are used in the gas-turbine cycle. The turbine exhaust is used directly without supplementary firing and leaves to the stack at 900°R. Steam is produced at 1200 psia and 950°F, and the condenser pressure is 1.2 psia. No feedwater heating is used, and the pump work may be ignored. Draw the flow and T-s diagrams labelling points correspondingly, and calculate: (a) The heat added, per pound mass of air, (b) The steam flow, in pounds per pound mass of air, (c) The combined work, in BTUs per pound mass of air, (d) The combined plant efficiency, (e) The plant efficiency if the steam cycle is inoperative, and (f) Perform a full exergy analysis for the combined cycle and identify the key sources of irreversibilities.
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