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Thermodynamics monster task

  1. Nov 30, 2014 #1
    Some circle process contains next stages:
    1.adiabatic compression
    2. isochoric heating
    3. adiabatic spreading
    4. isochoric cooling
    If we put ideal gas(x=1.4) in this process from starting conditions :
    -Volume (V=30dm3)
    -Pressure (P= 2.026bar)
    -Temperature (T=366K)
    * in first stage volume lows down on 20dm3,
    *on the second stage pressure goes on 4.13bar.
    CALCULATE VALUE OF ALL WORK AND ALL HEATING CHANGES IN THIS CIRCLE PROCESS!
    Result should be (delta) I>U =0 ;Q= -W= 453J

    This is what i used to calculate but didnt get right result:
    stage 1)
    P1V1=nRT1 ---->n
    Cv=5/2 R
    Q=0
    W=(delta) U= n Cv (delta)T ; delta T(T2-T1)
    T1/T2= (V2/V1) exp (x-1) ------> T2
    stage 2)
    W=0
    P1/P2= (V2/V1)exp (x) ----->P2
    T2/T3=P2/P3 ----->T3
    Q=nCv (delta)T ;delta T= (T3-T2)
    stage 3)
    T3/T4= (V4/V3) exp(x-1) ----->T4
    Q=0
    W=(delta)U= n Cv (delta)T ;delta T= ( T4-T3)
    stage 4)
    W=0
    Q=(delta)U= n Cv (delta)T ; delta T= (T1-T4)


    Did i messed smt with formulas? Calculating not problem, just this is a bit hard to visualise and set right formulas.. if someone can catch my mistake fast so i can try again, i dont want to bother anybary or take time. Thank you in front..
    I m new here, sorry if didnt apsorb all rules at first.
     
    Last edited by a moderator: Nov 30, 2014
  2. jcsd
  3. Nov 30, 2014 #2
    Please show us some more details of your calculations. It's really hard to figure out where you went wrong without that.

    Chet
     
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