Air enters a frictionless, constant-area duct with

M1 5 2.0, T1 5 300R, and p1 5 70 psia. Heat transfer occurs

as the air travels down the duct. A converging section

(A2/A3 5 1.5) is placed at the end of the constant area duct

and M3 5 1.0. Assuming isentropic flow (aside from the heat

transfer through the duct), calculate the amount and direction of heat transfer.