ME 3333 Chapter : Homework 8 Solutions
Document Summary
Saturated vapor r-134a at 500 kpa is throttled to 200 kpa in a steady flow through a valve. The kinetic energy in the inlet and exit flow is the same. Process: m e = m i = m. H2 = h1 = 407. 45 kj/kg from table b. 5. 2. Interpolate between 0oc and 10oc in table b. 5. 2 in the 200 kpa subtable superheated vapor. R-134a is throttled in a line flowing at 25oc, 750 kpa with negligible kinetic energy to a pressure of 165 kpa. Find the exit temperature and the ratio of exit pipe diameter to that of the inlet pipe (dex/din) so the velocity stays constant. 1 + gz1 = h2 + and v. State 1, table b. 5. 1: h1 = 234. 59 kj/kg, v1 = vf = 0. 000829 m3/kg. 1/v1 = (a2 v: / v2 (a2 / a1) = v2 / v1 = (d2 / d1)
