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Homework Help: Thermodynamics: Isobutane entropy and power problem

  1. Mar 26, 2012 #1
    1. The problem statement, all variables and given/known data
    Isobutane flows through an expander (like a turbine) at 680 moles/sec where it undergoes a change in state from 4826 kPa and 260 degrees Celsius to 483 kPa and 195 degrees Celsius.

    a) If the expander is adiabatic how much power is generated by the expander?
    b) What is the change in entropy for this operation?

    2. Relevant equations
    TC = 408.1 K
    PC = 3650 kPa
    CigR = A + BT + C(T^2) + D/(T^2) where T is in K, A = 1.667, B = 37.853*10-3, C = 11.945*10-6, and D = 0.

    3. The attempt at a solution
    I have no idea where to go with this problem for parts A and B. Can someone please give me a way to go about solving this problem
  2. jcsd
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