Bundle: Refrigeration and Air Conditioning Technology, 8th + MindTap HVAC, 4 terms (24 months) Printed Access Card
8th Edition
ISBN: 9781337190350
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Textbook Question
Chapter 42, Problem 11RQ
If a wall is made up of four different materials, all layered one on top of the other, how will the total R-value of the wall be determined?
A. By the one material with the highest R-value
B. By the one material with the lowest R-value
C. By averaging the R-values of the materials
D. By adding the R-values of the materials together
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28. The shaft shown in Figure P5-28 is supported by bear-
ings at each end, which have bores of 20.0 mm. Design
the shaft to carry the given load if it is steady and the
shaft is stationary. Make the dimension a as large as pos-
sible while keeping the stress safe. Determine the required
d = 20mm
D = ?
R = ?|
5.4 kN d=20mm
Length not
to scale
-a = ?-
+а=
a = ? +
-125 mm-
-250 mm-
FIGURE P5-28 (Problems 28, 29, and 30)
12. Compute the estimated actual endurance limit for SAE
4130 WQT 1300 steel bar with a rectangular cross sec-
tion of 20.0 mm by 60 mm. It is to be machined and
subjected to repeated and reversed bending stress. A reli-
ability of 99% is desired.
28. The shaft shown in Figure P5-28 is supported by bear-
ings at each end, which have bores of 20.0 mm. Design
the shaft to carry the given load if it is steady and the
shaft is stationary. Make the dimension a as large as pos-
sible while keeping the stress safe. Determine the required
d = 20mm
D = ?
R = ?|
5.4 kN d=20mm
Length not
to scale
-a = ?-
+а=
a = ? +
-125 mm-
-250 mm-
FIGURE P5-28 (Problems 28, 29, and 30)
Chapter 42 Solutions
Bundle: Refrigeration and Air Conditioning Technology, 8th + MindTap HVAC, 4 terms (24 months) Printed Access Card
Ch. 42 - An oversized air-conditioning system will A. cost...Ch. 42 - Methods used to calculate the heat gain and heat...Ch. 42 - An exterior wall A. separates a conditioned...Ch. 42 - A partition wall A. separates a conditioned...Ch. 42 - As the temperature differential across a panel...Ch. 42 - The typical indoor design temperature used for...Ch. 42 - The typical indoor design temperature used for...Ch. 42 - If a heating system was being designed for use in...Ch. 42 - If an air-conditioning system was being designed...Ch. 42 - If the R-value of a construction material is 2.0,...
Ch. 42 - If a wall is made up of four different materials,...Ch. 42 - Prob. 12RQCh. 42 - All of the following are taken into account on a...Ch. 42 - How much heat is lost through a 3' 5' single-pane...Ch. 42 - Which of the following is(are) true regarding a...Ch. 42 - Which of the following is(are) true regarding the...
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