 The Problem: Consider refrigerant R12 undergoing
a throttling process.

a) Given an inlet refrigerant temperature,
pressure and velocity of 50 C, 700 kPa and 15 m/s,
determine the outlet refrigerant temperature and velocity
for a given outlet pressure of 300 kPa.

b) Investigate the effect of varying the outlet
pressure on the outlet temperature and velocity and plot
the results.
A Drawing package created the following figure to graphically
describe the problem statement. EES allows the you to "Cut
and Paste" into a diagram window.
The first thing you have to do is type in the equations into
the Equations window. Typing
equations is just like typing into a word processor. The
equations can go in in any order and EES will automatically find
the best way to solve the equations. Thermodynamic and transport
property data for many fluids, such as R12 used here, are
provided with builtin functions. If you wish to see the
equations formatted in a mathematical manner look at the Formatted Equations window. These equations
can be cut and pasted into your favorite word processor. The Solution
window contains the results for
the outlet pressure equal to 300kPa. In order to see how the
outlet pressure changes the outlet velocity and outlet
temperature, a Parametric Table has been
created. You put the bold numbers into the table and use the
solve table command to find the outlet temperature and velocity
for each outlet pressure. The results have been plotted in the Plot
window.
