Consider a steam pipe of length l = 15 ft, inner radius r1=2 in, outer radius r2=2.4 in, and thermal conductivity k = 7.2 btu/hr-ft-of. steam is flowing through the pipe at an average temperature of 250of, and the average convective heat transfer coefficient on the inner surface is given to be h = 1.5 btu/hr-ft2-of. if the average temperature on the outer surfaces of the pipe is t2=160of, evaluate the rate of heat loss from the steam through the pipe.