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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Chapter 3, Problem 28RQ
Define flash gas, and explain how it applies to the net refrigeration effect of the refrigeration cycle.
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Q1/Create an estimated (S-N) diagram and define its equation for an axial fully reversed loaded steel bar. Its
cross section shown in figure (1). Determine the life in cycle that can be expected if the alternating stress is
(127Mpa). The bar surface finch is hot rolled. The operating temperature is (506 Co) and (du-577 Mpa).
120 mm.
4
Q4/ Find using a proper design theory the safety factor (N) based on point A for the circular
cantilever rod of a diameter (94 mm) shown in figure 3. Knowing that the rod is made of Stainless
Steel Type 304-cold rolled, Which is subjected to a force (F= 6.4 kN) inclined with y-axis by
0-72° and to a torque (T= 265π N. m).
Fig.3
L1=3.2 cm
L2= 3.6 cm
F
Z
Y
X
(15 Marks)
Q5/ Create an estimated S-N diagram and define its equation for an aluminum rectangular bar,
shown in figure 4 below, with a (out=342Mpa). The bar is loaded in a fully reversed bending
and the bar radius is 12 mm. Determine also the corrected fatigue strength at (N=2.3* 107 cycles).
Knowing that the bar surface finch is ground, the operating temperature is 155 C°, and Take a
99.99% reliability factor.
Fig. 4
h=5.6 cm
Head of the Department:
Dr. Deyaa Hassan Jawad Al-Jashami
b=4 cm
*** Best of Luck ***
(15 Marks)
Examiner:
Ass. Lect. Ahmed A. Toman
University of Babylon
Collage of Engineering\Al-Musayab
Department of Automobile
Engineering
Under Grad/Third stage
Notes:
1-Attempt Four Questions.
2- Q4 Must be Answered
3-Assume any missing data.
4 تسلم الأسئلة بعد الامتحان مع الدفتر
Subject: Mechanical
Element Design I
Date: 2022\01\25
2022-2023
Time: Three Hours
Course 1
Attempt 1
Q1/ Design a thin cylindrical pressure tank (pressure vessel) with hemispherical ends to the
automotive industry, shown in figure I below. Design for an infinite life by finding the
appropriate thickness of the vessel to carry a sinusoidal pressure varied from {(-0.1) to (6) Mpa}.
The vessel is made from Stainless Steel Alloy-Type 316 sheet annealed. The operating
temperature is 80 C° and the dimeter of the cylinder is 36 cm. use a safety factor of 1.8.
Fig. 1
(15 Marks)
Q2/ Answer the following:
1- Derive the design equation for the direct evaluation of the diameter of a shaft to a desired
fatigue safety factor, if the shaft subjected to both fluctuated…
Chapter 3 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 3 - Name three reasons why ice melts in an icebox:...Ch. 3 - What are the approximate temperature ranges tor...Ch. 3 - One ton of refrigeration is A. 1200 Btu. B. 12,000...Ch. 3 - Describe briefly the basic refrigeration cycle.Ch. 3 - What is the relationship between pressure and the...Ch. 3 - What is the function of the evaporator in a...Ch. 3 - What does the compressor do in the refrigeration...Ch. 3 - Define a superheated vapor.Ch. 3 - The evaporating pressure is 76 psig for R-22 and...Ch. 3 - If the evaporating pressure was 76 psig for R-22...
Ch. 3 - Define the term subcooled liquid.Ch. 3 - The condensing pressure is 260 psig and the...Ch. 3 - The condensing pressure is 260 psig and the...Ch. 3 - What is meant by a saturated liquid and vapor?Ch. 3 - What is meant by desuperheating a vapor?Ch. 3 - What happens to the refrigerant in the condenser?Ch. 3 - What happens to refrigerant heat in the condenser?Ch. 3 - The metering device A. cycles the compressor. B....Ch. 3 - What is adiabatic expansion?Ch. 3 - Describe flash gas, and tell how it affects...Ch. 3 - Quality means _________ when referring to a...Ch. 3 - Describe the difference between a reciprocating...Ch. 3 - List the cylinder color codes for R-12, R-22,...Ch. 3 - Define enthalpy.Ch. 3 - Define a pure compound refrigerant, and give two...Ch. 3 - Define net refrigeration effect as it applies to...Ch. 3 - Define heat of compression, and explain how it is...Ch. 3 - Define flash gas, and explain how it applies to...Ch. 3 - Define temperature glide as it pertains to a...Ch. 3 - Define a zeotropic refrigerant blend, and give an...Ch. 3 - Define a near-azeotropic refrigerant blend, and...
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