Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN: 9781305578296
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Textbook Question
Chapter 43, Problem 8RQ
Which metering device is most efficient in heat pumps?
A. A thermostatic expansion valve
B. An automatic expansion valve
C. A capillary tube
D. An orifice or restrictor
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A wheel of diameter 150.0 mm and width 37.00 mm carrying a load 2.200 kN rolls on a
flat rail. Take the wheel material as steel and the rail material as cast iron. Assume the
figure given, which is based on a Poisson's ratio of 0.3, is applicable to estimate
the depth at which the maximum shear stress occurs for these materials. At this critical
depth, calculate the Hertzian stresses σr, σy, σz, and Tmax for the wheel.
1.0
0.8
0, т
Ratio of stress to Pmax
0.4
0.6
90
69
0.2
0.5b
b
1.5b
Tmax
2b
Distance from contact surface
The Hertizian stresses are as follows:
02 = or = -23.8 psi for the wheel =|
necessary.)
σy for the wheel =|
MPa
σz for the wheel =
MPa
V4 for the wheel = |
MPa
2.5b
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3b
MPa (Include a minus sign if
Only question 3
Only question 2
Chapter 43 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 43 - How does a heart pump resemble a refrigeration...Ch. 43 - Name the three common sources of heat for heat...Ch. 43 - What large line connects the indoor unit to the...Ch. 43 - Why is the indoor unit not called an evaporator?Ch. 43 - When is the outdoor unit called an evaporator? A....Ch. 43 - The indoor coil is called a condenser during...Ch. 43 - Why is it important to have drainage for the...Ch. 43 - Which metering device is most efficient in heat...Ch. 43 - Where is the only permanent suction line on a heat...Ch. 43 - What type of drier may be used in the liquid line...
Ch. 43 - Where must a suction-line drier be placed in a...Ch. 43 - What controls the heat pump to determine whether...Ch. 43 - Can a heat pump switch from heating to cooling and...Ch. 43 - What must be done when frost and ice build up on...Ch. 43 - True or False: All heat pumps are practical...Ch. 43 - Why are scroll compressors more efficient than...Ch. 43 - Describe why variable-speed compressor motors are...
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