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A steel tube (k =15 W/ m-°C) whose inner and outer diameter 5 cm and 7.6 cm respectively, is covered with an insulative covering material of thickness 2 cm and k = 0.2 W/ m·°C. A hot gas at 300°C with h = 400 W/m².°C flows inside the tube. The outer surface of the insulation is exposed to cooler air at 30°C with h = 60 W/m?.°C. (i) Calculate the heat loss from the tube to the air for 10 m of the tube (ii) Determine the outer surface temperature and interface temperature between the tube and insulator.

A steel tube (k =15 W/ m-°C) whose inner and outer diameter 5 cm and 7.6 cm respectively, is covered with an insulative covering material of thickness 2 cm and k = 0.2 W/ m·°C. A hot gas at 300°C with h = 400 W/m².°C flows inside the tube. The outer surface of the insulation is exposed to cooler air at 30°C with h = 60 W/m?.°C. (i) Calculate the heat loss from the tube to the air for 10 m of the tube (ii) Determine the outer surface temperature and interface temperature between the tube and insulator.

Introduction to Chemical Engineering Thermodynamics
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
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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A steel tube (k =15 W/ m-°C) whose inner and outer diameter 5 cm and 7.6 cm respectively, is covered with an insulative covering material of thickness 2 cm and k = 0.2 W/ m•°C. A hot gas at 300°C with h = 400 W/m².°C flows inside the tube. The outer surface of the insulation is exposed to cooler air at 30°C with h= 60 W/m².C. (i) Calculate the heat loss from the tube to the air for 10 m of the tube (ii) Determine the outer surface temperature and interface temperature between the tube and insulator.
Transcribed Image Text:A steel tube (k =15 W/ m-°C) whose inner and outer diameter 5 cm and 7.6 cm respectively, is covered with an insulative covering material of thickness 2 cm and k = 0.2 W/ m•°C. A hot gas at 300°C with h = 400 W/m².°C flows inside the tube. The outer surface of the insulation is exposed to cooler air at 30°C with h= 60 W/m².C. (i) Calculate the heat loss from the tube to the air for 10 m of the tube (ii) Determine the outer surface temperature and interface temperature between the tube and insulator.
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