ME 3333 Chapter : Homework 6 Solutions
Document Summary
A piston/cylinder contains 1 kg water at 20oc with volume 0. 1 m3. By mistake someone locks the piston preventing it from moving while we heat the water to saturated vapor. Find the final temperature and the amount of heat transfer in the process. : m (u2 u1 ) = 1q2 1w2. T, v1 = v1/m = 0. 1 m3/kg > vf so two-phase. State 1: x1 = v1 - vf vfg. = 0. 0017131 u1 = uf + x1 ufg = 83. 94 + x1 2318. 98 = 87. 913 kj/kg. State 2: v2 = v1 = 0. 1 & x2 =1 (cid:198) found in table b. 1. 1 between 210 c and 215 c. = 210 + 5 0. 4584 = 212. 3 c u2 = 2599. 44 + 0. 4584 (2601. 06 2599. 44) = 2600. 2 kj/kg. 1q2 = m(u2 u1) = 1( 2600. 2 87. 913) = 2512. 3 kj. A vertical cylinder fitted with a piston contains 5 kg of r-410a at 10 c, shown in fig.
