DeGarmo's Materials and Processes in Manufacturing
12th Edition
ISBN: 9781118987674
Author: J. T. Black, Ronald A. Kohser
Publisher: WILEY
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Chapter 32, Problem 36RQ
To determine
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13.38 Consider the attic of a home located in a hot climate.
The floor of the attic is characterized by a width of
L₁ = 8 m while the roof makes an angle of 0 = 30° from
the horizontal direction, as shown in the schematic.
The homeowner wishes to reduce the heat load to the
home by adhering bright aluminum foil (ε = 0.07) onto
the surfaces of the attic space. Prior to installation of
the foil, the surfaces are of emissivity & = 0.90.
Attic
A2, 82, T2 0 = 30°
A1, E1, T₁
土
L₁ = 8 m
(a) Consider installation on the bottom of the attic
roof only. Determine the ratio of the radiation heat
transfer after to before the installation of the foil.
(b) Determine the ratio of the radiation heat transfer
after to before installation if the foil is installed
only on the top of the attic floor.
(c) Determine the ratio of the radiation heat transfer if
the foil is installed on both the roof bottom and the
floor top.
13.1
Determine F2 and F2 for the following configura-
tions using the reciprocity theorem and other basic
shape factor relations. Do not use tables or charts.
(a) Small sphere of area A, under a concentric hemi-
sphere of area A₂ = 3A₁
A₂
A1
(a)
(b) Long duct. Also, what is F₁₂?
A₂
Αν
(b)
(c) Long inclined plates (point B is directly above the
center of A₁)
B
100 mm
A₂
- 220 mm
(c)
(d) Long cylinder lying on infinite plane
+
A₁
Az
(d)
(e) Hemisphere-disk arrangement
-A₂, hemisphere,
diameter D
A₂
A₁, disk,
diameter D/2
(e)
(f) Long, open channel
1 m
AA₂
2 m
(f)
(g) Long cylinders with A₁ = 4A₁. Also, what is F₁₂?
-D₁
A1
-A₂
-D2
(e)
(h) Long, square rod in a long cylinder. Also, what
is F22?
w=D/5
18
A₁
-A2
(h)
-D
13.9 Determine the shape factor, F12, for the rectangles
shown.
6 m
1
3 m
6 m
1 m
2
6 m
1
0.5 m
2
1 m
(a) Perpendicular rectangles
without a common edge.
-1 m.
(b) Parallel rectangles of
unequal areas.
Chapter 32 Solutions
DeGarmo's Materials and Processes in Manufacturing
Ch. 32 - Why are surface processes so important?Ch. 32 - What are some of the factors that should be...Ch. 32 - How is the surface and its integrity altered by...Ch. 32 - Two surfaces can have the same microinch roughness...Ch. 32 - What limits the resolution of a stylus-type...Ch. 32 - Prob. 6RQCh. 32 - Prob. 7RQCh. 32 - What are some common abrasive media used in...Ch. 32 - Prob. 9RQCh. 32 - Why might there be an optimum fill level in barrel...
Ch. 32 - Prob. 11RQCh. 32 - Prob. 12RQCh. 32 - Prob. 13RQCh. 32 - What are some of the mechanisms of alkaline...Ch. 32 - Prob. 15RQCh. 32 - In view of its many attractive features, why has...Ch. 32 - Prob. 17RQCh. 32 - Prob. 18RQCh. 32 - Prob. 19RQCh. 32 - What are some of the functions of a prime coat in...Ch. 32 - Prob. 21RQCh. 32 - Prob. 22RQCh. 32 - What are some of the attractive features of...Ch. 32 - Prob. 24RQCh. 32 - Prob. 25RQCh. 32 - Prob. 26RQCh. 32 - Prob. 27RQCh. 32 - What are the attractive properties of hard chrome...Ch. 32 - Prob. 29RQCh. 32 - Prob. 30RQCh. 32 - Prob. 31RQCh. 32 - When anodizing aluminum, what features determine...Ch. 32 - Prob. 33RQCh. 32 - Prob. 34RQCh. 32 - What types of particulate composites can be...Ch. 32 - Prob. 36RQCh. 32 - Prob. 37RQCh. 32 - How and why are burrs made by the milling process?...Ch. 32 - Prob. 39RQCh. 32 - What are the effects of stress level, surface...Ch. 32 - What effect would abrupt surface changes, such as...Ch. 32 - Prob. 4CSCh. 32 - Prob. 5CS
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