2. As shown schematically in Figure 2, water steam with pressure and temperature of 3 MPa and 400 °C, respectively, is g

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2 As Shown Schematically In Figure 2 Water Steam With Pressure And Temperature Of 3 Mpa And 400 C Respectively Is G 1 (788.28 KiB) Viewed 24 times

2 As Shown Schematically In Figure 2 Water Steam With Pressure And Temperature Of 3 Mpa And 400 C Respectively Is G 2 (371.14 KiB) Viewed 24 times

2. As shown schematically in Figure 2, water steam with pressure and temperature of 3 MPa and 400 °C, respectively, is generated from a boiler and enters an adiabatic steam turbine at a velocity of 80 m/s. An adiabatic air compressor is direct-coupled with and powered by the steam turbine. The steam leaves the turbine at a velocity of 20 m/s as a saturated liquid with a temperature of 200 °C, and then enters a throttling valve. The steam leaves the throttling valve at a pressure of 0.5 MPa. Air enters the compressor at 100 kPa and 27 °C and exits at 1 MPa. The mass flow rates of the steam that enters the turbine and the air that enters the compressor are 20 kg/s and 100 kg/s, respectively. The heat loss from the throttling valve and kinetic energy changes during the processes in both the throttling valve and compressor are negligible. The potential energy effects are negligible in all the processes. You may assume air as ideal gas and its ideal gas constant is given as 0.287 kJ/(kg-K). Say Calculate the power output of the turbine. (7 marks) Calculate the ratio of the pipe cross-sectional areas between the outlet and the inlet of the turbine. (4 marks) to . (6) Calculate the quality of the steam when it leaves the throttling valve. (4 marks) (d) Calculate the specific enthalpy and specific volume of the air when leaving the compressor (10 marks) 16

Boiler Air P=3mga T2 400°C Penolla T= 2702 ma lookgls = souls Turbine Compressor mazolgle Satuucted rong h2 = 842.26 kolley liquid T 2004 Throttling valve P= impa m = toolgls P2o.tmra h22 852.26bolig Figure 2