A 0.20-m-diameter steel pipe [thickness = 5 mm, k = 20 W/(mK)] is used to transport saturated steam at a pressure of 20 bar (212 C) in a room for which the air temperature is 25C and the convection heat transfer coefficient at the outer surface of the pipe is 20 W/(m2K). What is the rate of heat loss per unit length from the bare pipe (no insulation)? Estimate how much heat rate per unit length can be reduced if a 50-mm-thick layer of insulation (magnesia, 85%) is added. The steam-side convection resistance as well as radiation heat transfer on both sides may be neglected in this estimation. Take the value of thermal conductivity of magnesia as 0.08 w/mC