If the cost of producing the hot water is $0.10 per kWh, what is the representative daily cost of heat loss from an uninsulated pipe to the air per meter of pipe length? The convection resistance associated with water flow in the pipe may be neglected. (b) Determine the savings associated with application of a 10-mm-thick coating of urethane insulation (k = 0.026 W/m-K) to

Elements Of Electromagnetics
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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(a) If the cost of producing the hot water is $0.10 per kWh, what is the representative daily cost
of heat loss from an uninsulated pipe to the air per meter of pipe length? The convection
resistance associated with water flow in the pipe may be neglected.
(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.

Hot water at 50°C is routed from one building in which it is generated to an
adjoining building in which it is used for space heating. Transfer between 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 V = 3 m/s in cross
flow over the pipe.
Transcribed Image Text:Hot water at 50°C is routed from one building in which it is generated to an adjoining building in which it is used for space heating. Transfer between 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 V = 3 m/s in cross flow over the pipe.
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