Hot water at 50 °C is routed from one building in which it is generated to an adjoining building in 2. which it is used for space heating. Transfer between the buildings occurs in a steel pipe (k 60 w/m.K) of 100-mm outside diameter and 8-mm wall thickness. During the winter, representative environmental conditions involve air at T.. = -5 °C and h 20 w/m2K in cross flow over the pipe. If the cost of producing the hot water is $0.05 per kwh, what is the representative daily a) cost of energy loss from an uninsulated pipe to the air per meter of pipe length? b) Determine the savings associated with application of a 10-mm-thick coating of urethane insulation (k 0.026 W/m. K) to the outer surface of the pipe.

Question
Hot water at 50 °C is routed from one building in which it is generated to an adjoining building in
2.
which it is used for space heating. Transfer between the buildings occurs in a steel pipe (k 60
w/m.K) of 100-mm outside diameter and 8-mm wall thickness. During the winter,
representative environmental conditions involve air at T.. = -5 °C and h 20 w/m2K in cross
flow over the pipe.
If the cost of producing the hot water is $0.05 per kwh, what is the representative daily
a)
cost of energy loss from an uninsulated pipe to the air per meter of pipe length?
b)
Determine the savings associated with application of a 10-mm-thick coating of
urethane insulation (k 0.026 W/m. K) to the outer surface of the pipe.
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Transcribed Image Text

Hot water at 50 °C is routed from one building in which it is generated to an adjoining building in 2. which it is used for space heating. Transfer between the buildings occurs in a steel pipe (k 60 w/m.K) of 100-mm outside diameter and 8-mm wall thickness. During the winter, representative environmental conditions involve air at T.. = -5 °C and h 20 w/m2K in cross flow over the pipe. If the cost of producing the hot water is $0.05 per kwh, what is the representative daily a) cost of energy loss from an uninsulated pipe to the air per meter of pipe length? b) Determine the savings associated with application of a 10-mm-thick coating of urethane insulation (k 0.026 W/m. K) to the outer surface of the pipe.

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