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Homework Help: Piston (pressure, volume, temperature)

  1. Jan 20, 2010 #1
    1. The problem statement, all variables and given/known data

    A piston/cylinder combination contains R-134a at x=1 and 1318.1 kPa. Find the exact phase it is in, the temperature, and specific volume.

    1. The piston is then pulled up in an isothermal process until the distance from the bottom of the cylinder is doubled. Construct the final phase in the Tv diagram. Label the lines with their values. Find the final temperature, pressure, specific volume, and quality if defined.

    2. Repeat if instead the piston is pushed into the cylinder until it is twice as close to the bottom of it as it was.

    2. Relevant equations

    V=Vf +x(Vg-Vf)

    3. The attempt at a solution

    I found the phase to be saturated vapor, the T=50 c and the specific volume 0.01512 (m^3)/Kg before doing 1.1 and 1.2.

    For 1.1 and 1.2 I was thinking about using PV=nRT, id this the right way to approach this problem?
    Last edited: Jan 20, 2010
  2. jcsd
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