The flames in an industrial furnace burn at 800°C on average and the convection coefficientbetween the hot gas and the inside wall of the furnace is ℎ1 = 30 W m2–K⁄ . The wall of thefurnace is made of steel (?? = 20 W m–K⁄ ) and is ? = 10 cm thick. To ensure nobody willburn themself on the exterior surface of the furnace, the steel is to be covered by aninsulating material with a low thermal conductivity (?? = 0.05 W m–K⁄ ). The airsurrounding the furnace is at 27°C and free convection on the exterior wall of the furnaceis expected to produce a convection coefficient of ℎ = 5 W/m2–K. Any radiation effects areexpected to be negligible in this analysis.a) If safety standards require that the outer surface of the furnace not exceed 65°C, howthick should the insulation layer be? This problem is most straightforward if youleverage the concept of thermal resistance.b) Using your result from part (a), calculate the overall heat transfer coefficient (?)from the furnace gas to the ambient air.c) Your analysis did not include the effects of contact resistance between the furnacewall and the insulation—did you therefore overestimate or underestimate therequired insulation thickness? Explain in a few sentences. The flames in an industrial furnace burn at 800°C on average and the convection coefficientbetween the hot gas and the inside wall of the furnace is h₁ = 30 W/m²-K. The wall of thefurnace is made of steel (k = 20 W/m-K) and is L = 10 cm thick. To ensure nobody willburn themself on the exterior surface of the furnace, the steel is to be covered by aninsulating material with a low thermal conductivity (k₂ = 0.05 W/m-K). The airsurrounding the furnace is at 27°C and free convection on the exterior wall of the furnaceis expected to produce a convection coefficient of h = 5 W/m²-K. Any radiation effects areexpected to be negligible in this analysis.a) If safety standards require that the outer surface of the furnace not exceed 65°C, howthick should the insulation layer be? This problem is most straightforward if youleverage the concept of thermal resistance.b) Using your result from part (a), calculate the overall heat transfer coefficient (U)from the furnace gas to the ambient air.c) Your analysis did not include the effects of contact resistance between the furnacewall and the insulation did you therefore overestimate or underestimate therequired insulation thickness? Explain in a few sentences.

Answered: Image /qna-images/answer/ac070d81-df30-4e66-8da5-96caaa16e38b.jpg

Answered: The flames in an industrial furnace…

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

See similar textbooks

Related questions

Question

The flames in an industrial furnace burn at 800°C on average and the convection coefficient
between the hot gas and the inside wall of the furnace is ℎ1 = 30 W m2–K⁄ . The wall of the
furnace is made of steel (?? = 20 W m–K⁄ ) and is ? = 10 cm thick. To ensure nobody will
burn themself on the exterior surface of the furnace, the steel is to be covered by an
insulating material with a low thermal conductivity (?? = 0.05 W m–K⁄ ). The air
surrounding the furnace is at 27°C and free convection on the exterior wall of the furnace
is expected to produce a convection coefficient of ℎ = 5 W/m2–K. Any radiation effects are
expected to be negligible in this analysis.
a) If safety standards require that the outer surface of the furnace not exceed 65°C, how
thick should the insulation layer be? This problem is most straightforward if you
leverage the concept of thermal resistance.
b) Using your result from part (a), calculate the overall heat transfer coefficient (?)
from the furnace gas to the ambient air.
c) Your analysis did not include the effects of contact resistance between the furnace
wall and the insulation—did you therefore overestimate or underestimate the
required insulation thickness? Explain in a few sentences.

Expert Solution

Trending now

This is a popular solution!

Step by step

Solved in 3 steps with 2 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.

Similar questions