1. Limited time only! Sign up for a free 30min personal 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!

Homework Help: Properties in a closed system Help

  1. Nov 2, 2008 #1
    Properties in a closed system...Help!!!

    1. The problem statement, all variables and given/known data
    A cylinder, locked by a plug, contains 1kg of 'wet' steam at a pressure of 5 bar (state point 1). In the locked position, heat is added through the wall of cylinder into the wet steam until the mixtures become dry saturated at 200 degrees(state point 2). The plug is then removed and the pistion is then allowed to expand isothemally(at 200 degrees) until the steam in the cylinder reaches its initial pressure of 5 bar( state point 3). Finally, the piston is returned to the initial state by compression via a heat rejection process. How to determine the properties (P,T,V and U) of the steam at those state points?

    2. Relevant equations

    3. The attempt at a solution
    From the question, we know that P1=P3=5 bar, V1=V2 and T2=T3=200 degrees. I am able to get V3=mRT/P3= (1x287x473)/500000=0.271.
    I can't continue from here as there's 2 unknown properties in the other 2 states.
    Can anyone help?
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted