Air enters a horizontal, constant-diameter heating duct operating at steady state at 290 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 0.04 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, in kW.

answer:

a

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i answer later k

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answer:

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