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 T, = 800 K, inner radius ri = 0.06 m, and outer radius r = 0.08. 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 Tur = Ta = 25°C. The surface emissivity of calcium silicate is approximately 0.8. W/m

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 T, = 800 K, inner radius ri = 0.06 m, and outer radius r = 0.08. 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 Tur = Ta = 25°C. The surface emissivity of calcium silicate is approximately 0.8. W/m

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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Question

As shown in the sketh below, a steam pipe of 0.12-m inside diameter is insulated with a layer of calcium silicate.
2. Ts.2}
1. Ts,1}
Steam
Insulation
(a) If the insulation is 22.5 mm thick and its inner and outer surfaces are maintained at T1 = 800 K and T,2 = 490 K, respectively,
what is the rate of heat loss per unit length (d) of the pipe, in W/m?
(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 T,1 = 800 K, inner radius ri = 0.06 m, and outer radius r2 = 0.08 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.

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 T, = 800 K, inner radius ri = 0.06 m, and outer radius r = 0.08. 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 Tur = Te = 25°C. The surface emissivity of calcium silicate is approximately 0.8.
a =
W/m
T,2 =
K

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