1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Thermodynamics Question

  1. Feb 1, 2007 #1
    1. The problem statement, all variables and given/known data

    Determine the work required per pound mass to isothermally and frictionlessly compress R-134a in a closed system from a saturated vapor to a saturated liquid at 20 °F.

    2. Relevant equations

    3. The attempt at a solution

    I do not know where to begin with this problem. Any help would be appreciated. thanks.
  2. jcsd
  3. Feb 2, 2007 #2
    Start with the first law of thermodynamics. Probably a few assumptions in the problem, like KE and PE = ?
    Also you'll need the charts, probably in the back of your text.
  4. Feb 2, 2007 #3


    User Avatar
    Science Advisor

    Just to add:

    Write down the first law.

    Isentropic.....No Entropy production
    You can also assume no potential or kinetic changes.

    What is left?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Thermodynamics Question