An expansion in a gas turbine can be approximated with a polytropic process with exponent n = 1.25. The inlet air is at 2100 R, 120 psia and the exit pressure is 18 psia with a mass flow rate of 2 lbm/*. Find the turbine heat transfer and power output.
C.V. Steady state device, single inlet and single exit flow.
Notice: dP < 0 so dw > 0
ds > 0 so dq > 0
Notice this process has some heat transfer in during expansion which is unusual. The typical process would have n = 1.5 with a heat loss.
