As shown in the sketh below, a steam pipe of 0.12-m inside diameter is insulated with a layer of calcium silicate. 12. Ts.2} 1. Ts,1} Steam Insulation (a) If the insulation is 27.5 mm thick and its inner and outer surfaces are maintained at T,1 = 800 Kand T,2 what is the rate of heat loss per unit length (q) of the pipe, in W/m? = 490 K, respectively, %3D

Elements Of Electromagnetics
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As shown in the sketh below, a steam pipe of 0.12-m inside diameter is insulated with a layer of calcium silicate.
12. Ts.2}
1, Ts,1}
Steam
Insulation
= 490 K, respectively,
(a) If the insulation is 27.5 mm thick and its inner and outer surfaces are maintained at T,1
what is the rate of heat loss per unit length (q) of the pipe, in W/m?
= 800 K and T,2
(b) Determine the rate of heat loss per unit length (q'), in W/m, and outer surface temperature T,2, in K, for the steam pipe with the
inner surface temperature fixed at T1 = 800 K, inner radius rį = 0.06 m, and outer radius ry = 0.12 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.
%3D
Transcribed Image Text:As shown in the sketh below, a steam pipe of 0.12-m inside diameter is insulated with a layer of calcium silicate. 12. Ts.2} 1, Ts,1} Steam Insulation = 490 K, respectively, (a) If the insulation is 27.5 mm thick and its inner and outer surfaces are maintained at T,1 what is the rate of heat loss per unit length (q) of the pipe, in W/m? = 800 K and T,2 (b) Determine the rate of heat loss per unit length (q'), in W/m, and outer surface temperature T,2, in K, for the steam pipe with the inner surface temperature fixed at T1 = 800 K, inner radius rį = 0.06 m, and outer radius ry = 0.12 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. %3D
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