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Reversible/Irreversible Closed Systems - Expansion Work of a Closed Adiabatic Device

  1. Feb 4, 2013 #1
    2. A closed, adiabatic device claims to derive useful work by expanding 1 kg of steam from 500 C and 20 bar to 100 C and 1 bar. Do you believe this claim? Assume steam is a real fluid following the steam tables in Appendix A.III.
     
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  3. Feb 4, 2013 #2

    rude man

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    Re: Reversible/Irreversible Closed Systems - Expansion Work of a Closed Adiabatic Dev

    "Adiabatic"; what does that tell you about entropy change?
     
  4. Feb 4, 2013 #3
    Re: Reversible/Irreversible Closed Systems - Expansion Work of a Closed Adiabatic Dev

    "Adiabatic" indicates that there is No change in entropy due to heat transfer. Therefore that would eliminate the (SQ/T) and leave us with (S2-S2 = Sgen)
     
    Last edited: Feb 4, 2013
  5. Feb 4, 2013 #4

    rude man

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    Re: Reversible/Irreversible Closed Systems - Expansion Work of a Closed Adiabatic Dev

    Yes, so go to your tables and find out if s has or has not changed between your two given states.
     
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