Question

Find the missing properties among (T, P, v, u, h and x if applicable) and give the phase of the substance and indicate the states relative to the two-phase region in both a T-v and a P-v diagram.

a.  R-12 P = 500 kPa, h = 230 kJ/kg

b.  R-22 T = 10°C, u = 200 kJ/kg

c. R-134aT = 40°C, h = 400 kJ/kg

Answer 1

 h > hg = > superheated vapor, look in section 500 kPa and interpolate

T = 68.06°C, v = 0.04387 m3/kg, u = 208.07 kJ/kg

States shown are placed relative to the two-phase region, not to each other.