Solution cont. Alternatively, Closed system Imaginary piston' Boundary work: P;1 MPa !(constant) ;=12 Pidv=-Pi(V2 -Vi)=-P[Vank-(Vink +Vi)]=PV; 1MPa V--volume occupied by the steam before it enters tank Energy balance for the closed system P2=1 MPa △E=2-Won (b)The closed-system Wbin=△U equivalence 1 iPiVi=mau2-miui ->W2=u;+P=h; 上游充通大 April 8,2018 6 SHANGHAI JIAO TONG UNIVERSITYApril 8, 2018 6 Solution cont. Alternatively, Closed system 1MPa Boundary work: -- volume occupied by the steam before it enters tank Energy balance for the closed system   E Q Wb,in