A 300-ft-long section of a steam pipe whose outer diameter is 4 in passes through an open space at 50°F. The average temperature of the outer surface of the pipe is measured be 280°F, and the average heat transfer coefficient on that surface is determined to be 6 Btu/h-ft2-°F. Determine (a) the rate of heat loss from the steam pipe and (b) the annual cost of this energy loss if steam is generated in a natural as furnace having an efficiency of 86 percent, and the priced natural gas is $ 1.10/therm (1 therm = 100,000 Btu).
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