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Q1. The below figure shows a cross section of a square channel with the width of a. = 2.7 m, inside of which there is a square empty space with the width of a; = 1.35 m. The hot fluid flows in the inner channel in such a way that the wall temperature remains constant at 400 K. The outer wall of channel transfers heat to the surrounding air. The convection heat transfer coefficient of the air is assumed to be 50 W/m K and the ambient temperature is 300 K. If the channel is made of carbon steel and its initial temperature is 300 K, then solve the problem until it reaches a steady state condition. Plot temperature distribution at different times. T= 300X 4 -1.35m a. =2.7m * =50(# / 'x)