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Tank problem

  1. Sep 2, 2015 #1
    1. The problem statement, all variables and given/known data

    A tank has a saturated liquid at 0.2 MPa. An amount of heat is transferred until the pressure in the tank became 0.1 MPa. If the volume of the tank 1 m3. Determine:

    1- The final state of the water

    2- The mass of the vapor in the tank

    3- The work

    4- The process on P-v diagram


    2. Relevant equations
    V=C (Volume is constatnt)
    m (mass) = Volume (V) / Specific volume (v)

    3. The attempt at a solution


    v1=vf |P=0.2 MPa = 0.8857 m3/kg

    v1= v2=0.8857 m3/kg

    At P1=0.1 MPa, v2=0.8857 m3/kg: vf < v2 < vg

    The water is mixture of saturated liquid and saturated vapor --> The final state of the water


    m=V/v = (1/0.8857) = 1.13 kg --> The mass of the vapor in the tank


    Work is zero since the volume is constant --> The work

    P-v diagram: http://i.imgur.com/Kz0cVVP.jpg

     
  2. jcsd
  3. Sep 2, 2015 #2
    There seems to be some missing information, like the total amount of water in the tank. Please write out the exact statement of the problem.

    Chet
     
  4. Sep 2, 2015 #3
    That's the exact statement of the problem. I guess we have to assume that the tank is full of water, which means that the volume of water is 1 m3.
     
  5. Sep 2, 2015 #4

    HallsofIvy

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    Staff Emeritus
    Science Advisor

    You said the tank contained a "saturated liquid". What is a saturated liquid?
     
  6. Sep 2, 2015 #5
    Assuming that the tank is full, what is the specific volume of saturated liquid water at a saturation pressure of 0.2 MPa? What is the specific volume of saturated liquid water at a saturation pressure of 0.1 MPa?

    Chet
     
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