(a) If the insulation is 27.5 mm thick and its inner and outer surfaces are maintained at Ts,1=800 K and Ts,2=490 K, respectively, what is the rate of heat loss per unit length (q′) of the pipe, in W/m? (b) Determine the rate of heat loss per unit length (q′), in W/m, and outer surface temperature Ts,2, in K, for the steam pipe with the inner surface temperature fixed at Ts,1=800 K, inner radius r1=0.06 m, and outer radius r2= 0.18 m. The outer surface is exposed to an airflow (∞T∞=25°C) that maintains a convection coefficient of h=25 W/m2·K and to large surroundings for which Tsur= T∞=25°C. The surface emissivity of calcium silicate is approximately 0.8.
(a) If the insulation is 27.5 mm thick and its inner and outer surfaces are maintained at Ts,1=800 K and Ts,2=490 K, respectively, what is the rate of heat loss per unit length (q′) of the pipe, in W/m? (b) Determine the rate of heat loss per unit length (q′), in W/m, and outer surface temperature Ts,2, in K, for the steam pipe with the inner surface temperature fixed at Ts,1=800 K, inner radius r1=0.06 m, and outer radius r2= 0.18 m. The outer surface is exposed to an airflow (∞T∞=25°C) that maintains a convection coefficient of h=25 W/m2·K and to large surroundings for which Tsur= T∞=25°C. The surface emissivity of calcium silicate is approximately 0.8.
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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(a) If the insulation is 27.5 mm thick and its inner and outer surfaces are maintained at Ts,1=800 K and Ts,2=490 K, respectively, what is the rate of heat loss per unit length (q′) of the pipe, in W/m?
(b) Determine the rate of heat loss per unit length (q′), in W/m, and outer surface temperature Ts,2, in K, for the steam pipe with the inner surface temperature fixed at Ts,1=800 K, inner radius r1=0.06 m, and outer radius r2= 0.18 m. The outer surface is exposed to an airflow (∞T∞=25°C) that maintains a convection coefficient of h=25 W/m2·K and to large surroundings for which Tsur= T∞=25°C. The surface emissivity of calcium silicate is approximately 0.8.
Transcribed Image Text:12. Ts.2}
1, Ts,1}
Steam
Insulation
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