HW_19 - 3) A gas-turbine power plant operating on an ideal...

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1) A cold air Brayton Cycle produces 14 MW with an inlet state of 17°C and 100 kPa. The pressure ratio is 16:1. The heat added in the combustion is 960 kJ/kg. What is the highest temperature and mass flow rate of air? 2) An ideal air-standard Brayton cycle in which the air into the compressor is at 100kPa and 20°C. The pressure ratio across the compressor is 12:1. The maximum temperature in the cycle is 1100°C. The air flow rate is 10 kg/s. Assuming constant specific heat for the air determine: a. The compressor work b. The turbine work c. The thermal efficiency d. The thermal efficiency if an ideal regenerator was incorporated
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Unformatted text preview: 3) A gas-turbine power plant operating on an ideal Brayton cycle has a pressure ratio of 8. The gas temperature is 300 K at the compressor inlet and 1300 K at the turbine inlet. Assuming a compressor efficiency of 80% and a turbine efficiency 85% determine: a. The back work ratio b. The thermal efficiency c. The turbine exit temperature 4) Brayton Cycle efficiency increases with increases in pressure ratio and temperature ratio. So, designers want the turbine inlet pressure and temperature to be as high as possible. What determines the maximum allowable pressure and temperature? Due Monday August 2 nd , 10 AM....
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