(Solved):   don't copy plzz.. Part (3) Determine the work net, back-work ratio, and thermal efficiency ...

 

don't copy plzz..

Part (3) Determine the work net, back-work ratio, and thermal efficiency of the cycle under cold air standard assumptions (i.e., constant specific heat conditions) using the same information given in Project 2. Part (4) A combined gas-steam power plant that has a net power output of \( 300 \mathrm{MW} \). The pressure ratio of the gas turbine cycle is 10 . Air enters the compressor at \( 300 \mathrm{~K} \) and the turbine at \( 1200 \mathrm{~K} \). The combustion gases leaving the gas turbine are used to heat the steam at \( 5 \mathrm{MPa} \) to \( 350 \mathrm{C} \) in a heat exchanger. The combustion gases leave the heat exchanger at \( 400 \mathrm{~K} \). An open feedwater heater incorporated with the steam cycle operates at a pressure of \( 0.8 \mathrm{MPa} \). The condenser pressure is \( 10 \mathrm{kPa} \). Assuming isentropic efficiencies of 100 percent for the pump, 80 percent for the compressor, and 87 percent for the gas and steam turbines. Determine the following: (a) the mass flow rate ratio of steam to air (b) the amount of heat input in the combustion chamber (c) the thermal efficiency of the combined cycle.