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Homework Help: Refrigeration process

  1. Dec 6, 2009 #1
    1. The problem statement, all variables and given/known data
    Freon 13 is used as the refrigent in a commerical refrigeration process. At one point Freon 13 enters a heat exchanger at a pressure of 1 MPa and -25 degrees C. The liquid absorbs 115 KJ of heat per kg of Freon 13 entering the heat exchanger and exits at the same temp and pressure, but with a quality of 96%.

    Specifice volume of saturated liquid Freon 13 at 1 MPa and -25 degrees C is 5% of the saturated capor volume at this pressure and temperature.
    Also, vapor phase as these conditions is not an ideal gas.
    Critical Temp is 302 K and critical pressure is 4 MPa. MW = 104.3 gm/mole.

    2. Relevant equations
    What is the enthalpy of vaporization process?
    And if the operation temperature of Freon 13 in heat exchanger is lowered to -30 degrees C, what pressure would be required to stay on the saturation curve for vapor liquid equilibrium to carry out the evaporation at this new temperature?
  2. jcsd
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