A piston-cylinder device contains a saturated mixture of R-134a with a quality of 90% at 50 kPa. The quality of the mixture is raised to 100% by (i) compressing the mixture in an isentropic manner or, alternatively, (ii) by adding heat in a constant temperature process.
(a) Draw the two processes on a T-s diagram. Determine the change in specific internal energy (Δu)
(b) In (i).
(c) Adding heat at constant temperature.