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
Engine oil replacement Motorcycle is thoroughly drained by kicking the vehicle several times. Inspect the drain bolt washer and replace if necessary. Tighten the drai

If Engine Misfires Causes of Problem Remedy Incorrect Electrode gap of spark plug Electrode worn out Foule

i wanna know is production job is best or marketing after doing btech

Plate clutch pressure height: Check plate clutch pressure leg height by placing the plate clutch pressure on the surface plate. Plate clutch pressure should not tilt on the surfac

Assume the production function is given by the following equation (where a and b are positive constants): Q = aL+bK. What is the marginal rate of technical substitution of labor fo

Water jet machining is an advanced method for cutting plates using a high-velocity water jet mixed with abrasive powder. The jet comes out of a nozzle A of diameter d and follows t

Design Problem:  Design a pipeline and pump station to pump 100 MGD of water to the Mississippi river.  To reduce the required horsepower of the pumps, the flow will be pressurized

Q. Show the types of Changes in project? During the development and execution of a project, the following changes can occur:  Scope of work changes  Cost deviation

A truss of span 10 meters is loaded as shown in Figure. Determine the forces in all the members of the truss by Method of Joint.

MODERN ARC WELDING POWER SOURCES Recent advances in the field of solid state power electronics have helped to improve the status of welding power sources. With the development rel