Hot air at atmospheric pressure and 80°C enters an 8-m-long uninsulated square duct of cross section 0.2 m x 0,2 m that passes through the attic of a house at a rate of 0.15 m³/s. The outside surface of the duct is observed to be nearly isothermal at 60°C. The air is leaving the duct at a temperature of 71°C. Determine the heat loss from the duct to the attic space. Hint: The temperature of the inside surface of the duct will be assumed isothermal, and equal to the outside surface of the duct. -T,= 60°C Air 0.2 m 1 atm 71°C Air 1 atm 80°C 0.2 m 8 m
Hot air at atmospheric pressure and 80°C enters an 8-m-long uninsulated square duct of cross section 0.2 m x 0,2 m that passes through the attic of a house at a rate of 0.15 m³/s. The outside surface of the duct is observed to be nearly isothermal at 60°C. The air is leaving the duct at a temperature of 71°C. Determine the heat loss from the duct to the attic space. Hint: The temperature of the inside surface of the duct will be assumed isothermal, and equal to the outside surface of the duct. -T,= 60°C Air 0.2 m 1 atm 71°C Air 1 atm 80°C 0.2 m 8 m
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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Transcribed Image Text:Hot air at atmospheric pressure and 80°C enters an 8-m-long uninsulated square duct of cross
section 0.2 m x 0.2 m that passes through the attic of a house at a rate of 0.15 m3/s. The outside
surface of the duct is observed to be nearly isothermal at 60°C. The air is leaving the duct at a
temperature of 71°C. Determine the heat loss from the duct to the attic space.
Hint: The temperature of the inside surface of the duct will be assumed isothermal, and equal to the
outside surface of the duct.
T = 60°C
Air
1 atm
0.2 m
Air
71°C
1 atm
80°C
0.2 m
8 m
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