Q2: A circular tube transmits hot oil at 250-C inside a 10-cm-inside-diameter tube such that hi 2000 W/m2. C, and ho= 100 W/m2.-C. The tube has a wall thickness of 6 mm with a thermal conductivity of 16 W/m C. The ambient air is at 30 C. 1) Calculate the heat loss per unit length. 2) Find an isulation thickness with k 0.17 W/m •C so that heat loss will reduce by half of no insulation case.

Q2: A circular tube transmits hot oil at 250-C inside a 10-cm-inside-diameter tube such that hi 2000 W/m2. C, and ho= 100 W/m2.-C. The tube has a wall thickness of 6 mm with a thermal conductivity of 16 W/m C. The ambient air is at 30 C. 1) Calculate the heat loss per unit length. 2) Find an isulation thickness with k 0.17 W/m •C so that heat loss will reduce by half of no insulation case.

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.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.36P

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Q2: A circular tube transmits hot oil at 250-C inside a 10-cm-inside-diameter tube such that hi
2000 W/m2. C, and ho= 100 W/m2.C. The tube has a wall thickness of 6 mm with a thermal
conductivity of 16 W/m- C. The ambient air is at 30 C. 1) Calculate the heat loss per unit
length. 2) Find an isulation thickness with k=0.17 W/m •C so that heat loss will reduce by half
of no insulation case.

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