As shown in the sketh below, a steam pipe of 0.12-m inside diameter is insulated with a layer of calcium silicate. '2. Ta 2} 1. Ts,1} Steam Insulation (a) If the insulation is 12.5 mm thick and its inner and outer surfaces are maintained at T,1 = 800 K and T,2 = 490 K, respectively, what is the rate of heat loss per unit length (g') 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 T1 = 800 K, inner radius r = 0.06 m, and outer radius r2 = 0.14 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 Tur = T. = 25°C. The surface emissivity of calcium silicate is approximately 0.8. Part A If the insulation is 12.5 mm thick and its inner and outer surfaces are maintained at T,1 = 800 K and T,2 = 490 K, respectively, what is the rate of heat loss per unit length (q') of the pipe, in W/m? d = W/m
As shown in the sketh below, a steam pipe of 0.12-m inside diameter is insulated with a layer of calcium silicate. '2. Ta 2} 1. Ts,1} Steam Insulation (a) If the insulation is 12.5 mm thick and its inner and outer surfaces are maintained at T,1 = 800 K and T,2 = 490 K, respectively, what is the rate of heat loss per unit length (g') 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 T1 = 800 K, inner radius r = 0.06 m, and outer radius r2 = 0.14 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 Tur = T. = 25°C. The surface emissivity of calcium silicate is approximately 0.8. Part A If the insulation is 12.5 mm thick and its inner and outer surfaces are maintained at T,1 = 800 K and T,2 = 490 K, respectively, what is the rate of heat loss per unit length (q') of the pipe, in W/m? d = W/m
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter1: Basic Modes Of Heat Transfer
Section: Chapter Questions
Problem 1.70P: The thermal conductivity of fibreglass insulation at 67F is 0.02 Btu/h ft F. What is its value in SI...
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