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.
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.
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
Related questions
Question
Task 2. Answer only 2
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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