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Question: 9 an overhead 25mlong uninsulated industrial steam pipe of 100mm...

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9. An overhead 25-m-long, uninsulated industrial steam pipe of 100-mm diameter is routed through a building whose walls and air are at 25°C. Pressurized steam maintains a pipe surface temperature of 150°C, and the coefficient associated with natural convection is h 10 W/m2-K. The surface emissivity is ε-0.8. a. What is the rate of heat loss from the steam line? b. If the steam is generated in a gas-fired boiler operating at an efficiency of η 0.90 $0.02 per MJ, what is the annual cost of heat loss and natural gas is priced at C from the line?

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