Hot air at 60°C leaving the furnace of a houseenters a 12-m-long section of a sheet metal duct of rectangularcross section 20 cm * 20 cm at an average velocityof 4 m/s. The thermal resistance of the duct is negligible,and the outer surface of the duct, whose emissivity is 0.3,is exposed to the cold air at 10°C in the basement, with aconvection heat transfer coefficient of 10 W/m2?K. Taking thewalls of the basement to be at 10°C also, determine (a) thetemperature at which the hot air will leave the basement and(b) the rate of heat loss from the hot air in the duct to thebasement. Evaluate air properties at a bulk mean temperatureof 50°C. Is this a good assumption?
Hot air at 60°C leaving the furnace of a houseenters a 12-m-long section of a sheet metal duct of rectangularcross section 20 cm * 20 cm at an average velocityof 4 m/s. The thermal resistance of the duct is negligible,and the outer surface of the duct, whose emissivity is 0.3,is exposed to the cold air at 10°C in the basement, with aconvection heat transfer coefficient of 10 W/m2?K. Taking thewalls of the basement to be at 10°C also, determine (a) thetemperature at which the hot air will leave the basement and(b) the rate of heat loss from the hot air in the duct to thebasement. Evaluate air properties at a bulk mean temperatureof 50°C. Is this a good assumption?
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
Related questions
Question
Hot air at 60°C leaving the furnace of a house
enters a 12-m-long section of a sheet metal duct of rectangular
cross section 20 cm * 20 cm at an average velocity
of 4 m/s. The thermal resistance of the duct is negligible,
and the outer surface of the duct, whose emissivity is 0.3,
is exposed to the cold air at 10°C in the basement, with a
convection heat transfer coefficient of 10 W/m2?K. Taking the
walls of the basement to be at 10°C also, determine (a) the
temperature at which the hot air will leave the basement and
(b) the rate of heat loss from the hot air in the duct to the
basement. Evaluate air properties at a bulk mean temperature
of 50°C. Is this a good assumption?
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 4 steps with 13 images
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Recommended textbooks for you
Elements Of Electromagnetics
Mechanical Engineering
ISBN:
9780190698614
Author:
Sadiku, Matthew N. O.
Publisher:
Oxford University Press
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:
9780134319650
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:
9781259822674
Author:
Yunus A. Cengel Dr., Michael A. Boles
Publisher:
McGraw-Hill Education
Elements Of Electromagnetics
Mechanical Engineering
ISBN:
9780190698614
Author:
Sadiku, Matthew N. O.
Publisher:
Oxford University Press
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:
9780134319650
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:
9781259822674
Author:
Yunus A. Cengel Dr., Michael A. Boles
Publisher:
McGraw-Hill Education
Control Systems Engineering
Mechanical Engineering
ISBN:
9781118170519
Author:
Norman S. Nise
Publisher:
WILEY
Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:
9781337093347
Author:
Barry J. Goodno, James M. Gere
Publisher:
Cengage Learning
Engineering Mechanics: Statics
Mechanical Engineering
ISBN:
9781118807330
Author:
James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher:
WILEY