A 300 ft long section of a steam pipe whose outer diameter is 4 in passes through an open space at 50F The average temperature of the outer surface of the pipe is measured to be 280F, and the average heat transfer coefficient on that surface is determined to be 6 Btu hft 2 F Determine (a) The rate of heat loss from the steam pipe (b) The annual cost of this energy loss if steam is generated in a natural gas furnace having an efficiency of 86 percent, and the price of natural gas is $1 10 therm (1 therm 100,000 Btu)

Question: A 300-ft-long section of a steam pipe whose outer diameter is 4 in passes through an open space at 50F. The average temperature of the

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 to 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

(b) The annual cost of this energy loss if steam is generated in a natural gas furnace having an efficiency of 86 percent, and the price of natural gas is $1.10/therm (1 therm = 100,000 Btu).

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