(Solved): Q2/ A combined gas-steam power cycle, the topping cycle is a simple ideal gas cycle that has a pres ...

Q2/ A combined gas-steam power cycle, the topping cycle is a simple ideal gas cycle that has a pressure ratio of 8 . Air enters the compressor at \( 20^{\circ} \mathrm{C} \) at a rate of \( 15 \mathrm{~kg} / \mathrm{s} \) and the gas turbine at \( 1000^{\circ} \mathrm{C} \). The bottoming cycle is an ideal Rankine cycle between the pressure limits of \( 5 \mathrm{MPa} \) and \( 8 \mathrm{kPa} \). Steam is heated in a heat exchanger at a rate of 2 \( \mathrm{kg} / \mathrm{s} \) by the exhaust gases leaving the gas turbine and the exhaust gases leave the heat exchanger at \( 170^{\circ} \mathrm{C} \). Determine the net power output and the thermal efficiency of the