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!

EES exercises - doubts

  1. Dec 19, 2013 #1
    1. The problem statement, all variables and given/known data
    Hello! I'm studying for a Thermodynamics exam and I need to solve these problems in EES (Engineering Equation Solver). Below the questions, there's my resolution. Can someone confirm if they are right?

    1) The vapor quality of water, using u=2000 kJ/kg and s=6 kJ/kg×K (Steam_IAPWS tables).
    2) The specific volume of water, using x=0.8 e h=2400 kJ/kg (Steam_IAPWS tables).
    3) The enthalpy and temperature of R134a fluid, using v=0.8 m^3/kg e u=300 kJ/kg (R134a tables). In which phase is the fluid? Justify your answer using a calculation.
    4) Compare, calculating the percent error, the specific volume of air, real gas, with the specific volume of air, ideal gas, for T=-120 ºC and P=2000 kPa.
    5) Compare, calculating the percent error, the specific volume of water, real gas, with the specific volume of water, ideal gas, for T=-120 ºC and P=2000 kPa.

    Thanks! :smile:

    2. Relevant equations



    3. The attempt at a solution
    1) x_1=Quality(Steam_IAPWS;s=6;u=2000)

    2) v_2=Volume(Steam_IAPWS;h=2400;x=0,8)

    3)
    h_3=Enthalpy(R134a;v=0,8;u=300)
    T_3=Temperature(R134a;v=0,8;u=300)

    Phase: I know it's superheated steam, but how do I justify with a calculation?

    4)
    v_4=Volume(Air_ha;T=-120;P=2000)
    v_5=Volume(Air;T=-120;P=2000)
    error_1=((v_5-v_4)/v_4)*100

    5)
    v_6=Volume(Water;T=380;P=23000)
    v_7=Volume(H2O;T=380;P=23000)
    error_2=((v_7-v_6)/v_6)*100
     
  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?



Similar Discussions: EES exercises - doubts
  1. TAOCP Exercise 5.1.1-6 (Replies: 0)

Loading...