Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN: 9781305578296
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 28, Problem 8RQ
Which are power supplies used for truck refrigeration?
A. Gas-engine driven compression
B. Electric compressor operated with a motor generator
C. Diesel compressor
D. All of the above
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
A power transistor with three 0.8 mm diameter leads of a copper-silver alloy (k = 400 W/m-K) dissipates 3.5 Watts of
power. The printed circuit board (PCB) on which the transistor is mounted is maintained at 30 C. The air temperature is
20 C and the heat transfer coefficient for the leads is 60 W/m² K. The length of the leads from the transistor to printed
circuit board is 9.0 mm.
(a) Determine the maximum lead temperature neglecting all convection effects.
(b) Determine the maximum lead temperature if convection is present.
T=20C
h = 60 W/m²K
Air
Power
Transistor
Lead
k = 400 W/m K
TPCB = 30 C
9 mm
A window in a tall building experiences a horizontal wind flow parallel to the surface at a velocity of 8 m/s. The window
measures 2 m high, 1.5 m wide and 6.5 mm thick. The transition from the building wall to the window glass surface is
not smooth. The window casement that surrounds the edge of glass pane is raised 10 mm above the surface of the glass
and adjacent wall structure. Inside the building, the air temperature and heat transfer coefficient for the interior surface
are 21 °C and 9 W/m² K respectively. The window has a uniform thermal conductivity of 1.4 W/m K. If the outdoor air
temperature is 5 °C, determine the rate of convective heat loss from the window. Develop a thermal resistance network
for the window system. Please state and justify all assumptions. Neglect any conduction through the casement.
Assume the following air properties: kair =0.0248 W/m K, v= 14.20 x 106 m²/s, Pr = 0.712.
Outside Air
u=8m/s
T=5°C
casement
glass
Inside
2 m
T=21°C
h=9W/m² K
6.5 mm
1.5 m…
A thin electrical heater that dissipates 2 kW of thermal energy is position between two plane walls. The thickness of
each wall is shown in the figure below. The thermal conductivities of sections A and B are 3 W/m C and 0.8 W/m C
respectively. The electrical heater is assumed to be highly conductive (k=200 W/m C). The exterior surface of each wall
experiences convective conditions as summarized below.
(a) Construct the thermal circuit representing the steady state heat transfer for the system. Label all nodes, resistances
and relevant terms.
(b) Determine the temperate of the electrical heater.
T = 50 C
h = 200 W/m² C
A
10 cm
6 cm
B
Electrical
Heater
T_ = 20 C
h = 50 W/m² C
K₁ = 3 W/m²K
0.05 cm
k₁ = 0.08 W/m² K
Chapter 28 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 28 - List the evaporating temperatures for liquid...Ch. 28 - Prob. 2RQCh. 28 - Prob. 3RQCh. 28 - Prob. 4RQCh. 28 - Prob. 5RQCh. 28 - Prob. 6RQCh. 28 - Prob. 7RQCh. 28 - Which are power supplies used for truck...Ch. 28 - What type of reserve capacity does truck...Ch. 28 - Why is truck refrigeration designed to provide...
Ch. 28 - How is the air distributed over the cargo in truck...Ch. 28 - Name two types of engines used for truck...Ch. 28 - Prob. 13RQCh. 28 - Truck trailers with their own refrigeration...Ch. 28 - Why is two-stage compression popular for...Ch. 28 - An R-404A system is operating with a -50F...Ch. 28 - Describe cascade refrigeration and tell why more...Ch. 28 - Why is a circulating brine system more attractive...Ch. 28 - Two methods used to power refrigeration...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- I need answer with diagram and not from AIarrow_forwardOne -1/x²-10.5x+1Z 84.5 11 2x2 +212 +382 2 2 -23.500 81 4th Year 24. (i) Derive a mathematical model for the mechanical system represented below, where the input Automation and Control is the Force F, and the output is the displacement x. (ii)Determine the general transfer function of the system given that the input is an impulsive force of 10N and the following constants (iii\Determine the output as a F(s) (iii) What is the output x as a function of time? EX Rnd 0 COM 7 4 Ran# Ra 25 (N/m) 5 kg 30 (N.s/m) Ans(i) ref notes 2 2 s² + 6s+5 25. A control system has a forward path transfer function of (111) (iii) x(t) = 0.5(e-t-e-5t) 2 and a negative feedback loop four S+2 with a transfer function 4. What will be the (time) response of the system to a unit step input? Ans: 0.2(1-e-10) 10 26. A control system has a forward path transfer function of and a negative feedback loop S+3 with a transfer function 5. What will be the (time) response of the system to a (a) unit impulsive input? (b) a…arrow_forwardfour One -H = 2x2 +212 +382 2 x² -23.5x + x37 84 x -10.5x+h 84.5 Automation and Control 4th Year 24. (i) Derive a mathematical model for the mechanical system represented below, where the input is the Force F, and the output is the displacement x. (ii)Determine the general transfer function of the system given that the input is an impulsive force of 10N and the following constants (iii\Determine the output as a F(s) (iii) What is the output x as a function of time? 25 (N/m) F 5 kg 30 (N.s/m) 2 Ans(i) ref notes (iii) (iii) x(t) = 0.5(e-t-e-st) 2 and a negative feedback loop S+2 s² + 6s+5 25. A control system has a forward path transfer function of with a transfer function 4. What will be the (time) response of the system to a unit step input? CON 4 1 Rnd Rane R 0 EL SALVADOR Ans: 0.2(1-e-10) 10 s+3 and a negative feedback loop 26. A control system has a forward path transfer function of with a transfer function 5. What will be the (time) response of the system to a (a) unit impulsive…arrow_forward
- find the temperature distribution of the beam shown below, take &=o.!! and L-1m- of C" loko -10C" 30 со h2 5 Kwlm²-ko T = 250° q=30twarrow_forwardQ1/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. 4arrow_forwardQ4/ 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. Tomanarrow_forward
- 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…arrow_forwardwhat is the scientific interpetation of all of what comes: 1- axial loading 2- Direct shear loading 3- Torsional loading 4. Bending load 4- Explain it in detail and how to use it to solve mechanical design Problemsarrow_forwardConsider the magnetic levitation system shown in Figure 1. An electromagnet is located at the upper part of the experimental system. Using the electromagnetic force f, you want to suspend the iron ball. Assume that the state variables are x₁ = x, x2 = x, and x3 =i. The electromagnet has an inductance L = 0.508H and a resistance R = 23.2. Use a Taylor series approximation for the electromagnetic force. The current is i₁ = 10 + i, where I = 1.06A is the operating point and i is the variable. The mass m is equal to 1.75kg. The gap is x = x + x, where x = 4.36mm is the operating point and x is the variable. The electromagnetic force is f = k(₁₁/xg)², where k = 2.9 × 10-4 Nm²/A². a) Determine the state matrix differential equation. b) Find the equivalent transfer function X(s)/V(s). Note: v(t) (+ Electromagnet i₁(t) Iron ball Force f(t) x(t) mg Gap sensor Figure 1 The magnetic levitation system is essentially unworkable. Hence, feedback control is crucial. A standard induction probe of the…arrow_forward
- Q3/ a steel plate shown in figure (3): Su689 Mpa, reliability is 90%, factor of safety is 2, the size factor is 0.87. machined surface. Determine the plate thickness (t) for infinite life. Note: All dimensions are in mm. P= ± 50 kN 100 Fig. 3 177 5r P = ± 50 kN 540 50arrow_forwardQ2/A cantilever beam, shown in figure (2), is to be made from [Wrought-Aluminum Alloys- 3003- cold rolled]. If the desired design factor is (N-2.5), (P-4kN), and (F-6kN). Using a suitable failure theory, find the appropriate beam thickness h. T D=15cm d=100mm r=20mm L= 25 cm Karrow_forwardSolve full assignment with steps pleasearrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Refrigeration and Air Conditioning Technology (Mi...Mechanical EngineeringISBN:9781305578296Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill JohnsonPublisher:Cengage Learning
Refrigeration and Air Conditioning Technology (Mi...
Mechanical Engineering
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:Cengage Learning
The Refrigeration Cycle Explained - The Four Major Components; Author: HVAC Know It All;https://www.youtube.com/watch?v=zfciSvOZDUY;License: Standard YouTube License, CC-BY