A rectangular furnace of 5 m by 5 m by 8 m inside dimensions is constructed of an insulative material having a thermal conductivity of 0.8 W/m. K. The wall thickness is 0.5 m. The inner and outer surface temperatures are 700 °C and 30 °C respectively. 5x5x8

A rectangular furnace of 5 m by 5 m by 8 m inside dimensions is constructed of an insulative material having a thermal conductivity of 0.8 W/m. K. The wall thickness is 0.5 m. The inner and outer surface temperatures are 700 °C and 30 °C respectively. 5x5x8

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 2.54P

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Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

100%

i. Calculate the heat loss through the furnace wall (all sides) by using conduction shape factor.

ii. Calculate the heat loss through the furnace wall by using thermal resistance from each side (6 sides).

iii. Determine the percentage difference of heat loss between case (i) and case (ii).

iv. Explain why the heat transfer for both cases are different.

A rectangular furnace of 5 m by 5 m by 8 m inside dimensions is constructed
of an insulative material having a thermal conductivity of 0.8 W/m. K. The
wall thickness is 0.5 m. The inner and outer surface temperatures are 700 °C
and 30 °C respectively.
5x5x8

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