A liquid food is being pumped in a 1 cm thick steel pipe. The inside diameter of the pipe is 5 cm. The bulk temperature of liquid food is 90°C. The inside pipe surface temperature is 80°C. The surface heat-transfer coefficient inside the pipe is 15 W/(m2K). The pipe has a 2 cm thick insulation. The outside bulk air temperature is 20°C. The surface heat-transfer coefficient on the outside of insulation is 3 W/m2Calculate the insulation surface temperature exposed to the outside..If the pipe length is doubled, how would it influence the insulation surface temperature? Discuss. A thin-walled concentric tube counter-flow heat exchanger is used to cool engine oil from 160oC to 60oC, and water is available at 25oC, to be used as coolant. The oil and water flow rates are each 2 kg/s and the diameter of the inner tube is 0.5 m. The corresponding value of the overall heat transfer coefficient is 250 W/m2 How long must the heat exchanger be to accomplish the desired cooling? Assume specific heat of oil to be ½ of that for water.

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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.

Chapter2: Steady Heat Conduction

Section: Chapter Questions

Problem 2.38P: 2.38 The addition of aluminum fins has been suggested to increase the rate of heat dissipation from...

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A liquid food is being pumped in a 1 cm thick steel pipe. The inside diameter of the pipe is 5 cm. The bulk temperature of liquid food is 90°C. The inside pipe surface temperature is 80°C. The surface heat-transfer coefficient inside the pipe is 15 W/(m²K). The pipe has a 2 cm thick insulation. The outside bulk air temperature is 20°C. The surface heat-transfer coefficient on the outside of insulation is 3 W/m²
Calculate the insulation surface temperature exposed to the outside.
.If the pipe length is doubled, how would it influence the insulation surface temperature? Discuss.
A thin-walled concentric tube counter-flow heat exchanger is used to cool engine oil from 160^oC to 60^oC, and water is available at 25^oC, to be used as coolant. The oil and water flow rates are each 2 kg/s and the diameter of the inner tube is 0.5 m. The corresponding value of the overall heat transfer coefficient is 250 W/m² How long must the heat exchanger be to accomplish the desired cooling? Assume specific heat of oil to be ½ of that for water.

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