An overhead 25 -m-long, uninsulated industrial steam pipe of 100mm diameter is routed hrough a building whose walls and air are at 25C. Pressurized steam maintains a pipe surface temperature of 150C, and the coefficient associated with natural convection is h=10W/m2K. The surface emissivity is =0.8. (a) What is the rate of heat loss from the steam line? (Ans: 18405W ) (b) If the steam is generated in a gas-fired boiler operating at an efficiency of f=0.90 and natural gas is priced at Cg=$0.02 per MJ, what is the annual cost of heat loss from the line? (Ans: $12900 )