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1. Find the rate of heat leakage for a spherical tank 2 m inside diameter and 12 mm thick with thermal conductivity of the material 45 W/m°C, containing liquid oxygen at -183°C. The tank is covered with 50 mm thick insulation having thermal conductivity 0.083 W/m°C. The outer surface is exposed to air at 27°C with convective heat transfer coefficient h = 20 W/m2°C. 2. In most problems involving tanks, why is the tank material not taken into account in calculating the heat transfer rate? Compare your answer in item 1 when the tank material is considered and when it is disregarded.

1. Find the rate of heat leakage for a spherical tank 2 m inside diameter and 12 mm thick with thermal conductivity of the material 45 W/m°C, containing liquid oxygen at -183°C. The tank is covered with 50 mm thick insulation having thermal conductivity 0.083 W/m°C. The outer surface is exposed to air at 27°C with convective heat transfer coefficient h = 20 W/m2°C. 2. In most problems involving tanks, why is the tank material not taken into account in calculating the heat transfer rate? Compare your answer in item 1 when the tank material is considered and when it is disregarded.

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
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1. Find the rate of heat leakage for a spherical tank 2 m inside diameter and 12 mm thick with thermal conductivity of the material 45 W/m°C, containing liquid oxygen at -183°C. The tank is covered with 50 mm thick insulation having thermal conductivity 0.083 W/m°C. The outer surface is exposed to air at 27°C with convective heat transfer coefficient h = 20 W/M2°C. 2. In most problems involving tanks, why is the tank material not taken into account in calculating the heat transfer rate? Compare your answer in item 1 when the tank material is considered and when it is disregarded.
Transcribed Image Text:1. Find the rate of heat leakage for a spherical tank 2 m inside diameter and 12 mm thick with thermal conductivity of the material 45 W/m°C, containing liquid oxygen at -183°C. The tank is covered with 50 mm thick insulation having thermal conductivity 0.083 W/m°C. The outer surface is exposed to air at 27°C with convective heat transfer coefficient h = 20 W/M2°C. 2. In most problems involving tanks, why is the tank material not taken into account in calculating the heat transfer rate? Compare your answer in item 1 when the tank material is considered and when it is disregarded.
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