Consider the conditions of Example 9.3, including
Chapter 9, Problem 9.36(choose chapter or problem)
Consider the conditions of Example 9.3, including theeffect of adding insulation of thickness tand thermalconductivity k?0.035 W/m?K to the duct. We wishto now include the effect of radiation on the outer sur-face temperatures and the total heat loss per unit lengthof duct.(a) If Ts,1?45?C, t?25 mm, ?1, and Tsur?288 K,what are the temperatures of the side, top, and bot-tom surfaces? What are the corresponding heatlosses per unit length of duct?(b) For the top surface, compute and plot Ts,2and qas afunction of insulation thickness for 0t50 mm.The exposed duct surface (t?0) may also beassumed to have an emissivity of ?1
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