C.V. Water out to surroundings at 700°C. This is a control mass.
Work is found from the process (area in P-V diagram)
1W2 = mP(v2 - v1) = 2 × 5000(0.08849 – 0.00104) = 874.6 kJ
The heat transfer from the energy equation is
1Q2 = U2 - U1 + 1W2 = m(u2 - u1) + mP(v2 - v1)= m(h2 - h1)
1Q2 = 2(3900.1 - 422.72) = 6954.76 kJ
Entropy generation from entropy equation
1S2 gen = m(s2 - s1) - 1Q2/Tres
= 2(7.5122 - 1.303) - 6954/973 = 5.27 kJ/K