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    Steam turbine output power

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    The mass rate of flow into a steam turbine is 4500 kg/h and the heat transfer from the turbine is 8.8 kW. The following data are known for the steam entering and leaving the turbine.

    Inlet Exit
    Pressure 20 bar 1 bar
    Temperature 420 C
    Quality 100%
    Velocity 60 m/s 150 m/s
    Elevation above datum 5 m 3 m

    Determine the output power of the turbine.

    © BrainMass Inc. brainmass.com December 24, 2021, 7:46 pm ad1c9bdddf
    https://brainmass.com/engineering/manufacturing-engineering/steam-turbine-output-power-217937

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    Solution:

    The useful power can be determined by applying the equation of energy:
    (1)
    where
    steam (water) mass flow rate (kg/s)

    inlet specific static enthalpy (and similarly for the outlet) (kJ/kg)
    inlet, respectively outlet velocities (m/s)
    elevations above datum (m)
    g = gravity acceleration (g = 9.8 m/s2)
    output (useful) power of turbine (kW)
    heat transfer rate from turbine (kW)
     (2)

    Assuming an isentropic process between inlet and outlet, the following formula applies:
    (3)
    where
    k = adiabatic exponent (for superheated steam, k = 1.3)
    T1 = 420C = 420 + 273 = 693 K
    specific heat of steam at constant pressure (kJ/kg.K)
    Assuming a constant average value of specific heat during the process, we can use the formula:
    (4)
    where
    R = steam gas constant, R = 461.9 J/kg.K

    By substituting in (2), one yields:
    (5)

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    © BrainMass Inc. brainmass.com December 24, 2021, 7:46 pm ad1c9bdddf>
    https://brainmass.com/engineering/manufacturing-engineering/steam-turbine-output-power-217937

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