An oil preheater consists of a single tube of 10-mm diameter and 5-m length, with its combustion gases. The engine oil (new) enters at 70°C. What flow rate, in kg/h, must be supplied to maintain an oil outlet temperate of 105°C? What is the corresponding heat transfer rate, in W? kg/h W

An oil preheater consists of a single tube of 10-mm diameter and 5-m length, with its combustion gases. The engine oil (new) enters at 70°C. What flow rate, in kg/h, must be supplied to maintain an oil outlet temperate of 105°C? What is the corresponding heat transfer rate, in W? kg/h W

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

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter6: Forced Convection Over Exterior Surfaces

Section: Chapter Questions

Problem 6.16P

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Question

An oil preheater consists of a single tube of 10-mm diameter and 5-m length, with its surface maintained at 180°C by swirling
combustion gases. The engine oil (new) enters at 70°C. What flow rate, in kg/h, must be supplied to maintain an oil outlet temperatur
of 105°C? What is the corresponding heat transfer rate, in W?
m =
kg/h
W

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