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Thermodynamics throttling device

  1. Dec 1, 2014 #1
    1. The problem statement, all variables and given/known data
    Steam at 550 bar and 475 °C undergoes a throttling expansion to 1 bar in a steady-state process. What will be the temperature of the steam after the expansion? Calculate the internal energy of the fluid.

    2. Relevant equations
    h2 = h1

    3. The attempt at a solution
    the temperature of the steam after the expansion is 99.6c according to steam tables as temperature of saturation at 1 bar is 99.6c so the temperature cannot be below that if the outlet fluid has to be steam?
    no idea how to find the internal energy though......
  2. jcsd
  3. Dec 1, 2014 #2


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    How is the internal energy of the steam related to its enthalpy? There is a handy formula for this which you haven't included in the Relevant equations.
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