A gas-turbine power plant operates on a modified Brayton cycle with an overall pressure ratio of 8. Air enters the compressor at 0°C and 100 kPa. The maximum cycle temperature is 1500 K. The compressor and the turbines are isentropic. The high- pressure turbine develops just enough power to run the compressor. Assume constant properties for air at 300 K with C₁ = 0.718 kJ/kg K, Cp= 1.005 kJ/kg K, R = 0.287 kJ/kg K, k=1.4. (a) Sketch the (T-s) diagram for the cycle. (b) Determine the temperature and pressure at state 4, the exit of the high-pressure turbine. (c) If the net power output is 200 MW, determine the mass flow rate of the air into the compressor, in kg/s.

A Brayton cycle with a pressure ratio of 15 operates with air entering the compressor at 70 kPa and 0°C, and the turbine at 600°C. Calculate the net specific work produced by this cycle treating the air as an ideal gas with variable specific heats.

A gas turbine power plant operates on a simple thermodynamic cycle. The ambient conditionsare 100 kPa and 24 °C. The air at this condition enters the engine at 150 m/s whose diameteris 0.5 m. The pressure ratio across the compressor is 18 k and the temperature at the turbineinlet is 1400 K. Assuming ideal operation for all components and specific heats for air andproducts separately. In addition, neglect the mass of fuel burned. Do the followings:a. Choose the suitable thermodynamic cycleb.Draw pv and Ts diagram and label itCalculate the power required by the compressordDetermine the pressure and the temperature at the turbine exit,Compute the power produced by the turbinef.Available specific workg.The thermal efficiency

A gas turbine power plant operates on a simple thermodynamic cycle. The ambient conditionsare 100 kPa and 24 °C. The air at this condition enters the engine at 150 m/s whose diameteris 0.5 m. The pressure ratio across the compressor is 19, and the temperature at the turbineinlet is 1400 K. Assuming ideal operation for all components and specific heats for air andproducts separately. In addition, neglect the mass of fuel burned. Do the followings:a. Choose the suitable thermodynamic cycleb. Draw pv and Ts diagram and label itc. Calculate the power required by the compressord. Determine the pressure and the temperature at the turbine exit,e. Compute the power produced by the turbinef. Available specific workg. The thermal efficiency

Instead, assume variable specific heat A gas-turbine power plant operates on the simpleBrayton cycle between the pressure limits of 100 and 800 kPa.Air enters the compressor at 308C and leaves at 3308C at amass flow rate of 200 kg/s. The maximum cycle temperatureis 1400 K. During operation of the cycle, the net power outputis measured experimentally to be 60 MW. Assume constantproperties for air at 300 K with cv 5 0.718 kJ/kg·K, cp 51.005 kJ/kg·K, R 5 0.287 kJ/kg·K, k 5 l.4.(a) Sketch the T-s diagram for the cycle.(b) Determine the isentropic efficiency of the turbine forthese operating conditions.(c) Determine the cycle thermal efficiency.

Consider an air standard jet engine cycle operating in a 280 K, 100 kPa environment. Thecompressor requires a shaft power input of 4000 kW. Air enters the turbine state 3 at1600 K, 2 MPa, at the rate of 9 kg/s, and the isentropic efficiency of the turbine is 85%.Determine the pressure and temperature entering the nozzle at state 4. If the nozzleefficiency is 95%, determine the temperature and velocity exiting the nozzle at state 5.

Pravinbhai

The air-standard Brayton cycle has a net power output of 100 kW. The working substance is air, entering the compressor at 30 , leaving the high-temperature heat exchange at 750 and leaving the turbine at 300 . Determine the mass flow rate of air in kilogram per hour

A gas turbine working on an air standard Brayton cycle has air enter into the compressor at atmospheric condition and 22°C. The pressure ratio is 9 and the maximum temperature in the cycle is 1077°C. Compute for the cycle/thermal efficiency per kg of air in percent.

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