Question

Air at 100 kPa, 300 K, flows through a device at steady state with the exit at 1000 K during which it went through a polytropic process with n = 1.3. Find the exit pressure, the specific work and heat transfer. 

Answer 1

C.V. Steady state device, single inlet and single exit flow. Energy Eq.   h₁ + q = h₂ + w

Neglect kinetic, potential energies

Notice: dP > 0 so dw <0 

ds < 0 so dq < 0