PART C Solve the following problems using MATLAB. 1) (Problem 10-86, engel & Boles, 9th Edition) Consider a combined gas-steam power plant that has a net power output of 280 MW. The pressure ratio of the gas-turbine cycle is 11. Air enters the compressor at 1 bar, 300 K, and the turbine at 1100 K. The pressure of air at the compressor inlet is 1 bar. The combustion gases leaving the gas turbine are used to heat the steam at 5 MPa to 350 C in a heat exchanger. The combustion gases leave the heat exchanger at 420 K. An open feedwater heater incorporated with the steam cycle operates at a pressure of 0.8 MPa. The condenser pressure is 10 kPa. Assuming isentropic efficiencies of 100% for the pump, 82% for the compressor, and 86% for the gas and steam turbines, determine (a) the mass flow rate ratio of air to steam, (b) the required rate of heat input in the combustion chamber, and (c) the thermal efficiency of the combined cycle. >> [ratio, Qdot, eff_c1] = hw8partcl ratio[1] (double) - the mass flow rate ratio of air to steam Qdot[kW] (double) - the required rate of heat input eff_c1[1](double) the thermal efficiency (0 < eff_c11) 2) (Problem 10-87, engel & Boles, 9th Edition) Reconsider part C.1. Using MATLAB, study the effects of the gas cycle pressure on the ratio of gas flow rate to steam flow rate and cycle efficiency. Vary the ratio of gas flow rate from 10 to 20 with step size of 2. The autograder will generate plots according to your results. >> [ratio_tbl,eff_tbl] = hw8partc2 - ratio_tbl[1] (1x6 double) the mass flow rate ratio of air to steam eff_tbl[1](1x6 double) the thermal efficiency (0 < eff_tbl1) -