Air enters a horizontal, constant-diameter heating duct
operating at steady state at 280 K, 1 bar, with a volumetric flow
rate of 0.25 m3/s, and exits at 325 K, 0.95 bar. The
flow area is 0.05 m2.
Assuming the ideal gas model with k = 1.4 for the air,
determine:
(a) the mass flow rate, in kg/s,
(b) the velocity at the inlet and exit, each in m/s, and
(c) the rate of heat transfer to the air, in kW