100 kg of R-134a at 200 kPa are contained in a piston-cylinder device whose volume is page 1523-4312.322 m3. The piston is now moved until the volume is one-half its original size. This is done such that the pressure of the R-134a does not change. Determine the final temperature and the change in the total internal energy of the R-134a.

Fig: 1