Thermodynamics Question

[ashkash]

1. The problem statement, all variables and given/known data

Determine the work required per pound mass to isothermally and frictionlessly compress R-134a in a closed system from a saturated vapor to a saturated liquid at 20 °F.

2. Relevant equations



3. The attempt at a solution

I do not know where to begin with this problem. Any help would be appreciated. thanks.

[teknodude]

Start with the first law of thermodynamics. Probably a few assumptions in the problem, like KE and PE = ?
Also you'll need the charts, probably in the back of your text.

[FredGarvin]

Just to add:

Write down the first law.

Isothermal.....Q=0
Isentropic.....No Entropy production
You can also assume no potential or kinetic changes.

What is left?