Part a $(90/100)$

a$1-$Consider a combined gas$-$steam power cycle similar to the figure below. The topping cycle is a simple Brayton cycle that has a pressure ratio of $7\mathrm{.}5(\frac{P_8}{P_7}).$ Air enters the compressor a ${60}^{7}7$ at a rate of $70lb\frac{m}{s}$ and the gas turbine at $1740F.$ The bottoming cycle is a reheat Rankine cycle botzesen the pressure limits of $900$ psi and $1\mathrm{.}5$ psi $.$ Steam is heated in a heat exchanghile the steam leaves the heatthe gas turbine. The exhaust gases leave the heat exchange at $30$ pj and is reheated to $750F$ in the heat exchanger at $900F.$ Steam leaves the high$-$pressurbine. Assumin $85$ percent isentropic efficiency for all exchanger before it expands in the low$-$pres the corresponding T$-$S diagram and determine $($b$)$ the moisture pumps, compressors and turbines, $($a$)$ durbine, $($c$)$ the mass flow rate of the steam, $($d$)$ the net power content at the exit of the low$-$pressure the of the combined plant and $(f)$ the thermal efficiency of the output in kW $,($e$)$ the thermal efficiency is replaced by a simple Rankine cycle $($with no reheat in the steam combined cycle if the bottoming cycle is replions are the same conditions as listed at points $3$ and $6,$ respectively.

For the pump: $1\frac{\text{B}\text{t}\text{u}}{lbm}=5\mathrm{.}4\frac{f{t}^3*}{lbm}$

$(50$ points$)$Part a $(90/100)$

a$1-$Consider a combined gas$-$steam power cycle similar to the figure below. The topping cycle is a simple Brayton cycle that has a pressure ratio of $7\mathrm{.}5(\frac{P_8}{P_7}).$ Air enters the compressor a ${60}^{7}7$ at a rate of $70lb\frac{m}{s}$ and the gas turbine at $1740F.$ The bottoming cycle is a reheat Rankine cycle botzesen the pressure limits of $900$ psi and $1\mathrm{.}5$ psi $.$ Steam is heated in a heat exchanghile the steam leaves the heatthe gas turbine. The exhaust gases leave the heat exchange at $30$ pj and is reheated to $750F$ in the heat exchanger at $900F.$ Steam leaves the high$-$pressurbine. Assumin $85$ percent isentropic efficiency for all exchanger before it expands in the low$-$pres the corresponding T$-$S diagram and determine $($b$)$ the moisture pumps, compressors and turbines, $($a$)$ durbine, $($c$)$ the mass flow rate of the steam, $($d$)$ the net power content at the exit of the low$-$pressure the of the combined plant and $(f)$ the thermal efficiency of the output in kW $,($e$)$ the thermal efficiency is replaced by a simple Rankine cycle $($with no reheat in the steam combined cycle if the bottoming cycle is replions are the same conditions as listed at points $3$ and $6,$ respectively.

For the pump: $1\frac{\text{B}\text{t}\text{u}}{lbm}=5\mathrm{.}4\frac{f{t}^3*}{lbm}$

$(50$ points$)$