# Homework Help: Refrigeration process

1. Dec 6, 2009

### thermoA

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?