Agas at 450 k is flowing in a 2-in steel pipe, schedule 40. the pipe is insulated with51 mm of lagging having a mean k=0.0623 w/m/k. the convective heat-transfer coefficient of the gas inside the pipe is 30.7 w/m2/k and the convective coefficient of air on the outside of the lagging is 10.8. the air is at a temperature 300k. calculate the heat loss per unit length of pipe, and overall heat transfer coefficient based on outside area.