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The inner wall of a thermos bottle is at -10°C while the outer at 99°F. The space between the walls is evacuated and the walls are silvered so the emissivity is reduced to 0.10. If each wall has an area of 705 cm², how much energy is transformed by radiation between walls each second?

The inner wall of a thermos bottle is at -10°C while the outer at 99°F. The space between the walls is evacuated and the walls are silvered so the emissivity is reduced to 0.10. If each wall has an area of 705 cm², how much energy is transformed by radiation between walls each second?

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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TASK# 2. Solve problems involving heat transfer by radiation processes. Problem Solving Instructions: Analyze and solve the following problems. Enclose your final answer in a box. 1. The inner wall of a thermos bottle is at -10°C while the outer at 99°F. The space between the walls is evacuated and the walls are silvered so the emissivity is reduced to 0.10. If each wall has an area of 705 cm², how much energy is transformed by radiation between walls each second? 2. A steam pipe having a surface temperature of 250°C passes through a room where the temperature is 27°C. The outside diameter of the pipe is 100 mm and emissivity factor is 0.8. Calculate the radiated heat loss for 3 m pipe length. 3. How many watts will be radiated from a spherical black body 15 cm in diameter at a temperature of 800°C? Calculate the radiation in watts per square centimeter from a block of copper at 302°F and at 1732°F. The oxidized copper surface radiates at 58% the rate of a black body. 4. 5. A small sphere has a radius of 3.50 cm and is maintained at a temperature of 325°C. Assuming it to be a black body surrounded by empty space, how much energy does it radiate each second?
Transcribed Image Text:TASK# 2. Solve problems involving heat transfer by radiation processes. Problem Solving Instructions: Analyze and solve the following problems. Enclose your final answer in a box. 1. The inner wall of a thermos bottle is at -10°C while the outer at 99°F. The space between the walls is evacuated and the walls are silvered so the emissivity is reduced to 0.10. If each wall has an area of 705 cm², how much energy is transformed by radiation between walls each second? 2. A steam pipe having a surface temperature of 250°C passes through a room where the temperature is 27°C. The outside diameter of the pipe is 100 mm and emissivity factor is 0.8. Calculate the radiated heat loss for 3 m pipe length. 3. How many watts will be radiated from a spherical black body 15 cm in diameter at a temperature of 800°C? Calculate the radiation in watts per square centimeter from a block of copper at 302°F and at 1732°F. The oxidized copper surface radiates at 58% the rate of a black body. 4. 5. A small sphere has a radius of 3.50 cm and is maintained at a temperature of 325°C. Assuming it to be a black body surrounded by empty space, how much energy does it radiate each second?
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