Required information A gas-turbine power plant operates on a modified Brayton cycle shown in the figure with an overall pressure ratio of 8. Air enters the compressor at 0°C and 108 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 cy0.718 kJ/kg-K, Cp 1.005 kJ/kg-K, R 0.287 kJ/kg-K. and k-1.4. Combustion chamber Compressor High-pressure turbine Determine the temperature and pressure at state 4, the exit of the high-pressure turbine. The temperature at state 4 is The pressure at state 4 is [ K. Low-pressure kPa.

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.

Air enters the compressor of a gas turbine at 100 kPa and 25°C. pressure ratio 5 and For a maximum temperature of 850°C, the back work rate and thermal efficiency of the Brayton cycle Please specify.

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The ideal air-standard Brayton cycle operates with air entering the compressor at 95 kPa, 22°C. The pressure ratio rp is 6:1 and the air leaves the heat addition process at 1100 K. Determine the compressor work and the turbine work per unit mass flow, the cycle efficiency, the back work ratio, and compare the compressor exit temperature to the turbine exit temperature. Assume constant properties.

In a reheat cycle steam at 15 Mpa, 540°C enters the engine and expands to 1.95 Mpa. At this point the steam is withdrawn and passed through a reheater. It reenters the engine at 540°C. Expansion now occurs to the condenser pressure of 0.0035 Mpa. (a) For the ideal cycle, find ee (b) A 60,000 kW turbine operates between the same state points except that the steam enters the reheater at 1.95Mpa and 260°C, departs at 1.8 Mpa and 540°C. The steam flow is 147,000 kg/hr; generator efficiency is 96%. For actual engine, ek, mk, and nk, (c) Determine the approximate enthalpy of the exhaust steam if the heat lost through the turbine casing is 2% of the combined work.4. Steam at 200 bar, 760°C enters the thrott

A gas-turbine power plant operates on a modified Brayton cycle shown in the figure 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 compres¬sor 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 as cv = 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. Label the data states. (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.

3.     Assume an Otto cycle with compression ratio of CR = 9 : 1. The intake air is at 100kPa, 20oC, and the volume of the chamber is 500cm3 prior to the compression stroke. The temperature at the end of the adiabatic expansion is T4 = 800K. If air specific heat capacity at constant pressure of air at atmospheric pressure and room temperature is cp = 1.01KJ/kgK. Specific heat capacity at constant volume of air at atmospheric pressure and room temperature: cv = 0.718KJ/kgK.                   Calculate:       (i) the mass of the intake air;                                                (ii) the temperature T3;               (iii) the pressure p3;               (iv) the amount of heat added by burning fuel-air mixture;               (v) the thermal efficiency of the cycle;               (vi) the mean effective pressure (MEP).

Superheated steam generated in a power plant at a pressure of 8,600 kPa anda temperature of 500 ℃ is fed to a turbine. Exhaust from the turbine enters acondenser at 15 kPa, where it is condensed to saturated liquid, which is thenpumped to the boiler.(a) What is the thermal efficiency of a Rankine cycle operating at theseconditions?(b) What is the thermal efficiency of a practical cycle operating at theseconditions if the turbine efficiency and pump efficiency are both 75%?Which of the two efficiencies has greater impact on the thermal efficiency?(c) Sketch both cycles in the same T-s diagram.(d)If the power output of the turbine is 80,000 kW in case (b), calculate themass flow rate of the working fluid.(e) Calculate the heat transfer rates in the boiler and the condenser. Doublecheck the result for the condenser.(f) For both cases (a) and (b), make a comment about the operation of turbine(issue of cavitation). [one sentence is fine](g) How you would operate the condenser of a practical…

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