Problem 4.105 - Thermodynamics 7th edition - Moran Question Details: As shown in

Question

Problem 4.105 - Thermodynamics 7th edition - Moran

Question Details:
As shown in figure, hot industrial waste water at 15 bar, 180C with a mass flow rate of 5kg/s enters a flash chamber via a valve. saturated vapor and saturated liquid streams, each at 4 bar, exit the flash chamber. The saturated vapor enters the turbine and expands to 0.08 bar, x = 90%. Stray heat transfer and kinetic and potential energy effects are negligible.

For operation at steady state, determine the power, in hp, developed by the turbine?

Explanation / Answer

Flash chamber Entrance 15 bar,180C => compressed liq v = vf at 15bar =0.0012 Exit : Saturated vapour at 4 bar v= vg at 4 bar = 0.462 h= hg = 2738.1 s= 6.89 sat liquid at 4 bar v = vf = 0.0011 m= mf +mg Turbine exit: 0.08 bar x=0.9 h= 2340 Work done = m(h4- h3) = mg 298.1

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