REFRIGERATION+AIR COND.TECH.-W/2 ACCESS
8th Edition
ISBN: 9781337370042
Author: TOMCZYK
Publisher: CENGAGE L
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Chapter 48, Problem 5RQ
To determine
Two types of fan which are used for cooling tower.
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Create an estimation of S-N diagram for asteet, axially loaded
bar and define its equation. How many cycles of life can be expected
if the alternating stress is 100 MPa. The bar is 150 mm
has
9
The loading will be. pure axial, fully reversed.
hot-rolled finish. The operating temp. is 500 °C. Out = 600 MPa.
Square and
Ex. Repeat Ex. in page (24), with fluctuating load as shown
below. By = 462 M2, Out = 552 MPa. Find the safety factor
(NF) using Modified - Goodman, Gerber, and soderberg criterias
F(N)
400
100
time
ut
Ex. The cantilever beam shown is, made from steel with σ = 552 MPa
is subjected to fully reversed load. Neglect shear stress
q
:10 cycles
effect, estimate wheather the beam is safe or not safe at N= los
The beam is machined surface and the operating temp. is 100c.
D
764
L= 10cm
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d = 1 cm
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Chapter 48 Solutions
REFRIGERATION+AIR COND.TECH.-W/2 ACCESS
Ch. 48 - What is the purpose of the cooling tower in a...Ch. 48 - The typical difference in temperature between the...Ch. 48 - Prob. 3RQCh. 48 - Prob. 4RQCh. 48 - Prob. 5RQCh. 48 - Why should cooling towers be constructed with...Ch. 48 - Prob. 7RQCh. 48 - Prob. 8RQCh. 48 - Prob. 9RQCh. 48 - Prob. 10RQ
Ch. 48 - Vortexing in a cooling tower occurs in the A....Ch. 48 - Prob. 12RQCh. 48 - Prob. 13RQCh. 48 - What is the component that is installed between...Ch. 48 - Prob. 15RQCh. 48 - Prob. 16RQCh. 48 - Prob. 17RQCh. 48 - Prob. 18RQCh. 48 - What is meant by encapsulation and explain how it...Ch. 48 - Prob. 20RQCh. 48 - Explain how a particle separator works in a...
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- Ex. Design to Carry a Cylindrical thin pressure vessel with hemispherical ends for infinite life. Find the appropriate, thickness (t) of the vessel a sinusoidal pressure varied from (0) to (1 MPa). the vessel is made from steel 1030 hotrolled with out = 467.MP¬ and the operating temperature is 300 °C. The diameter of the cylinder D= 0.3 m . Using safety factor N = 2.arrow_forwardEx. Create an estimated S-N diagram for an aluminum bar and define its equation what is the corrected fatigue strength at 7 N = 2 * 10 cycles ? Out = 310 MPa, the forged bar is 3.81 cm in round. The load is fully reversed torsion.arrow_forward1 Estimate the factor of safety fora ductile materail having by = 100 MPa, with the state of stress shown in the element. 30 MPa 12MPA zo M R HP. 1 12MP 30 MPa 20 MPa x '12 MPaarrow_forward
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- 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 mmarrow_forwardA 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…arrow_forwardA 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 Karrow_forward
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