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Calculate and tabulate the thermal resistances (assume Tavg=470 K for the air gaps). If q''rad= 0.25W/cm^2, what is the outer surface temperature of turnout coat for inner temperature of 66C.

Calculate and tabulate the thermal resistances (assume Tavg=470 K for the air gaps). If q''rad= 0.25W/cm^2, what is the outer surface temperature of turnout coat for inner temperature of 66C.

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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Show the thermal circuit by labeling all the thermal resistances. 


Calculate and tabulate the thermal resistances (assume Tavg=470 K for the air gaps).

If q''rad= 0.25W/cm^2, what is the outer surface temperature of turnout coat for inner temperature of 66C. 

A firefighter's protective clothing (turnout coat) is shown schematically. Moisture Thermal Shell barrier liner Fire Imm kmb Imm side Lu Ls: Lmb T rad Air Gap Thickness (mm) Layer Sell (s) Moisture barrier (mb) Thermal liner (tl) k (W/mK ) 1 0.05 0.6 0.01 4 0.04 Heat is transferred by conduction and radiation exchange through the stagnant air. The radiation flux across the gap may be expressed as qmdgp = hma (T, –T,), where the linearized radiation coefficient is approximated as hmd z 40T, and Tavg represents the average temperature of the surfaces comprising the gap. avg
Transcribed Image Text:A firefighter's protective clothing (turnout coat) is shown schematically. Moisture Thermal Shell barrier liner Fire Imm kmb Imm side Lu Ls: Lmb T rad Air Gap Thickness (mm) Layer Sell (s) Moisture barrier (mb) Thermal liner (tl) k (W/mK ) 1 0.05 0.6 0.01 4 0.04 Heat is transferred by conduction and radiation exchange through the stagnant air. The radiation flux across the gap may be expressed as qmdgp = hma (T, –T,), where the linearized radiation coefficient is approximated as hmd z 40T, and Tavg represents the average temperature of the surfaces comprising the gap. avg
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