A manufacturing plant produces an efluent as a waste product. As part of a waste heat recovery system, they want to use this for internal heating and cooling. The effluent is flown through a system where its temperature remains at 303.15 K. A 0.06-m diameter pipe carrying hot water and 0.04-m diameter pipe carrying cold air is passed through this effluent chamber. It can be assumed that the surface temperature of these air and water pipes are same as the effluent temperature. Water comes in at 328.15 K and exits at 308.15 K. The air comes in at 268.15 K and exits at 298.15 K. The mass flow rate of water and air is respectively, 1 kg/s and 0.01 kg/s. Determine the length of the water and air pipes in the system. Convert all calculations to C.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
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Chapter6: Forced Convection Over Exterior Surfaces
Section: Chapter Questions
Problem 6.38P
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A manufacturing plant produces an efluent as a waste product. As part of a waste heat
recovery system, they want to use this for internal heating and cooling. The effluent is
flown through a system where its temperature remains at 303.15 K. A 0.06-m diameter
pipe carrying hot water and 0.04-m diameter pipe carrying cold air is passed through
this effluent chamber. It can be assumed that the surface temperature of these air and
water pipes are same as the effluent temperature. Water comes in at 328.15 K and exits
at 308.15 K. The air comes in at 268.15 K and exits at 298.15 K. The mass flow rate of
water and air is respectively, 1 kg/s and 0.01 kg/s. Determine the length of the water and
air pipes in the system. Convert all calculations to C.
Transcribed Image Text:A manufacturing plant produces an efluent as a waste product. As part of a waste heat recovery system, they want to use this for internal heating and cooling. The effluent is flown through a system where its temperature remains at 303.15 K. A 0.06-m diameter pipe carrying hot water and 0.04-m diameter pipe carrying cold air is passed through this effluent chamber. It can be assumed that the surface temperature of these air and water pipes are same as the effluent temperature. Water comes in at 328.15 K and exits at 308.15 K. The air comes in at 268.15 K and exits at 298.15 K. The mass flow rate of water and air is respectively, 1 kg/s and 0.01 kg/s. Determine the length of the water and air pipes in the system. Convert all calculations to C.
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