An uninsulated steam pipe is used to transport high- temperature steam from one building to another. the pipe is of 0.5-m diameter. has a surface temperature of 150 degree c, and is exposed to ambient air at ? 10 degree c. the air moves in cross flow over the pipe with a velocity of 5 m/s. (a) what is the heat loss per unit length of pipe? (b) consider the effect of insulating the pipe with a rigid urethane foam (k = 0.026 w/m . k). evaluate and plot the heat loss as a function of the thickness of the insulation layer for 0 leq delta leq 50 mm.