A thick-walled tube of stainless steel(Ks=19.0 W/m.°C)  with 2-cm inner diameter (ID) and 4-cm outer diameter (OD) is covered with a 3-cm layer of asbestos insulation (ka =0.2 W/m.°C). If the temperatures of  inside wall of the pipe and the outside of the insulator are maintained at 600 and the surface temperature on the insulating material remained constant at 293 °C.  determine the values of r1,r2,and r3 from the below equation and calculate heat loss per unit lenght . q/L​=ln(r2​/r1​)/Ks​+ln(r3​/r2​)/Ka​2π(T1​−T2​)​

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
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A thick-walled tube of stainless steel(Ks=19.0 W/m.°C)  with 2-cm inner diameter (ID) and 4-cm outer diameter (OD) is covered with a 3-cm layer of asbestos insulation (ka =0.2 W/m.°C). If the temperatures of  inside wall of the pipe and the outside of the insulator are maintained at 600 and the surface temperature on the insulating material remained constant at 293 °C.

 determine the values of r1,r2,and r3 from the below equation and calculate heat loss per unit lenght .

q/L​=ln(r2​/r1​)/Ks​+ln(r3​/r2​)/Ka​2π(T1​−T2​)​

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