The inside surface of an insulation layer is maintained at 350°C and the outside surface dissipates heat by convection and radiation to air and wall, respectively. The temperatures of air and wall are 15 °C. The insulation layer has a thickness of 10 cm and a thermal conductivity of 15 W/m.K. What is the value of the heat transfer coefficient at the outside surface of the layer, if the temperature at the outside surface should not exceed 225 °C? (The emissivity and the width of the surface are 0.3 and 1 m., respectively. o=5.67x10-8 W/m²K*).

The inside surface of an insulation layer is maintained at 350°C and the outside surface dissipates heat by convection and radiation to air and wall, respectively. The temperatures of air and wall are 15 °C. The insulation layer has a thickness of 10 cm and a thermal conductivity of 15 W/m.K. What is the value of the heat transfer coefficient at the outside surface of the layer, if the temperature at the outside surface should not exceed 225 °C? (The emissivity and the width of the surface are 0.3 and 1 m., respectively. o=5.67x10-8 W/m²K*).

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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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

The inside surface of an insulation layer is maintained at 350°C and the outside surface dissipates
heat by convection and radiation to air and wall, respectively. The temperatures of air and wall are 15 °C.
The insulation layer has a thickness of 10 cm and a thermal conductivity of 15 W/m.K. What is the value of
the heat transfer coefficient at the outside surface of the layer, if the temperature at the outside surface
should not exceed 225 °C? (The emissivity and the width of the surface are 0.3 and1 m., respectively.
o-5.67x10-8 W/m²K*).
Tw=15°.
T=225°C
ɛ=0.3
ТЬ3350°C
To=15°C
h.=?
10 cm

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