Solution Cont. Sat.vapor (a)T2? 1.5 bars 1.014 bars 74[%-,10r0=L.673m水g 100C -u =u(100°C)=2506.5kJ/kg U2=U1 Table A-6 2 T, T2=273C 1.5 bars superheated 1.014 bars P2 1.5 bars 2=2767.8kJ/kg 100fC (b)W? Energy balance AU+AKE+A呢=-w W=-(U2-Ui)=-mu2-u1) work is on the system -(149kg)(2767.8-2506.5)kJ/kg 0.25m3 0.149kg 38.9kJ 1.673m3/kg 上游充通大 March 14,2019 6 SHANGHAI JIAO TONG UNIVERSITYMarch 14, 2019 6 Solution Cont. Table A-4 Sat. vapor Table A-6 superheated (a) T2 ? (b) W？ Energy balance work is on the system T1