(a) If the cost of producing the hot water is $0.10 per kWh, what is the representative daily costof heat loss from an uninsulated pipe to the air per meter of pipe length? The convectionresistance associated with water flow in the pipe may be neglected.(b) Determine the savings associated with application of a 10-mm-thick coating of urethaneinsulation (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 anadjoining building in which it is used for space heating. Transfer between buildings occurs in asteel pipe (k = 60 W/m-K) of 100-mm outside diameter and 8-mm wall thickness. During thewinter, representative environmental conditions involve air at T = -5°C and V = 3 m/s in crossflow over the pipe.

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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

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

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

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Chapter7: Forced Convection Inside Tubes And Ducts

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Problem 7.20P

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Question

(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.

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