C.V. Air.
Continuity Eq. m2 = m1 = m ;
Energy Eq. m(u2 − u1) = 1Q2 − 1W2
Entropy Eq m(s2 − s1) = ∫ dQ/T + 1S2 gen
Process: 1Q2 = 0, 1S2 gen = 0 => s2 = s1
(a) Using constant Cp gives the power relation
(b) Use the standard entropy function that includes variable heat capacity