Evaluate the power output of turbine, Mechanical Engineering

Evaluate the power output of turbine:

Q: A turbine in steam power plant operating under steady state conditions receives the superheated steam at 3MPa and 350ºC at the rate of 1kg/s and having velocity of 50m/s at an elevation of 2m above the ground level. The steam leaves turbine at 10kPa with a quality of 0.95 at an elevation of 5m above ground level. The exit velocity of steam is 120m./s. The energy losses as heat from turbine are estimated at 5kJ/s. Estimate the power output of turbine. How much error will be introduced, if kinetic energy and the potential energy terms are ignored?      

Sol.: Given that; the turbine is running under steady state condition. At inlet:

P1 = 3MPa; T1 = 350°C; mf = 1 kg/sec; V1 = 50 m/s; Z1=2mAt exit: P2  = 10kPa; x = 0.95; Z2  = 5 m;  V2  = 120 m/s Heat exchanged during expansion = Q = - 5 kJ/sec From superheat steam which is given as table, at 3MPa and 350ºC h1 = 3115.25 kJ/kgh2 = hf2  + xhfg2 From saturated steam table;  at 10kPa h2  = 191.81 + 0.95(2392.82) = 2464.99 kJ/kg

From the steady flow energy equation:

 

13_Evaluate the power output of turbine2.png

933_Evaluate the power output of turbine.png

If the changes in kinetic and potential energies are neglected; then

SFEE as; Q - Ws = mf (h2 - h1) - 5 - 1W2 = 1 × (2464.99 - 3115.25) 1W= 645.26KJ/sec

% Error introduced if kinetic energy and potential energy terms are ignored:

1348_Evaluate the power output of turbine1.png

2173_Evaluate the power output of turbine3.png

Posted Date: 10/15/2012 7:46:46 AM | Location : United States







Related Discussions:- Evaluate the power output of turbine, Assignment Help, Ask Question on Evaluate the power output of turbine, Get Answer, Expert's Help, Evaluate the power output of turbine Discussions

Write discussion on Evaluate the power output of turbine
Your posts are moderated
Related Questions

Calculate the angular deflection (in degrees) produced in a solid circular shaft of diameter 12.5mm and length 0.5 m when the shear stress is 25MPa and the shear modulus 70GPa. Wha

Find out the impact-force: A mass of 3 kg ball freely falls from a height of 2 metres on an anvil, & rise 0.5 metre after the blow. If the duration of impact is (1/50) th   of

Thermal Reservoir - Thermodynamics: Thermal Reservoir. A thermal reservoir is the part of environment that can exchange heat energy with system. It has adequately large capa

opitz system in group technology

Ask question # how to derive a expression for the centifugal tension in belt driver

Calculate quantity of steam in the vessel - thermodynamics: A closed metallic boiler drum having capacity of 0.24m 3 contains steam at pressure of 11bar and a temperature

Petrol: Work in a well-ventilated area. Keep flames or sparks away from the work area or where petrol is stored.

A steam boiler, 3 m in diameter, is made of 25 mm thick mild steel plates. The efficiency of longitudinal riveted joint is 88% and that of circumferential riveted joint is 70%. Cal

Shop assembled, steam drum, risers, downcomers, and all other related equipment on the steam side shall be designed, fabricated and hydrostatically tested to all requirements of AS