Lab Manual for Tomczyk/Silberstein/ Whitman/Johnson’s Refrigeration and Air Conditioning Technology, 8th
8th Edition
ISBN: 9781305578708
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Chapter 23, Problem 21RQ
To determine
The explanation for making a compressor oil free.
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3. An engine has three cylinders spaced at 120° to each other. The crank torque diagram can be simplified to a
triangle having the following values:
Angle
0°
Torque (Nm)
0
(a) What is the mean torque?
60°
4500
180°
180° to 360°
0
0
(b) What moment of inertia of flywheel is required to keep the speed to within 180 ± 3 rpm?
(c) If one cylinder of the engine is made inoperative and it is assumed that the torque for this cylinder is
zero for all crank angles, determine the fluctuation in speed at 180rpm for the same flywheel.
(a) 3375 Nm
(b) 50kgm
(c) ±21 rpm
Prob 5.
Determine the largest load P that can be applied to
the frame without causing either the average
normal stress or the average shear stress at section
a-a to exceed o-150 MPa and 1-60 MPa,
respectively.
Member CB has a square cross section of 25 mm
on each side.
2 m
FAC
1.5 m
Fac
Derive the component transformation equations for tensors shown below where [C] = [BA] is the DCM (direction cosine matrix) from frame A to B.
^B [T] = [C]^A [T] [C]^T
Chapter 23 Solutions
Lab Manual for Tomczyk/Silberstein/ Whitman/Johnson’s Refrigeration and Air Conditioning Technology, 8th
Ch. 23 - Describe the operation of a compressor.Ch. 23 - Name five types of compressors.Ch. 23 - True or FAlse: A compressor can compress a liquid.Ch. 23 - What would be considered a higher-than-normal...Ch. 23 - Which compressor type uses pistons to compress the...Ch. 23 - Which compressor type uses tapered, machined gear...Ch. 23 - Which style of compressor uses belts to turn the...Ch. 23 - What would be done to increase the compressor...Ch. 23 - Describe the reciprocating compressor piston, rod,...Ch. 23 - Name two things in the design of a reciprocating...
Ch. 23 - At what speeds in rpm does a hermetic compressor...Ch. 23 - What effect does a slight amount of liquid...Ch. 23 - What lubricates the refrigeration compressor? A....Ch. 23 - What can the service technician do to keep the...Ch. 23 - State the main advantage that a discus...Ch. 23 - Briefly describe how the scroll compressor...Ch. 23 - List four main advantages a scroll compressor has...Ch. 23 - What are two main reasons why a compressor should...Ch. 23 - Briefly describe how the digital capacity control...Ch. 23 - List the three main advantages of having digital...Ch. 23 - Prob. 21RQ
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