Materials Science and Engineering: An Introduction, 10th Edition EPUB Reg (Access) Card and Abridged (Loose-Leaf) Print Companion Set (NEW!!)
10th Edition
ISBN: 9781119463153
Author: Callister
Publisher: WILEY
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Chapter 22, Problem 3DP
To determine
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The role of materials engineering in “green design”.
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Dry atmospheric air enters an adiabatic compressor at a 20°C, 1 atm and a mass flow rate of 0.3kg/s. The air is compressed to 1 MPa. The exhaust temperature of the air is 70 degrees hottercompared to the exhaust of an isentropic compression.Determine,a. The exhaust temperature of the air (°C)b. The volumetric flow rate (L/s) at the inlet and exhaust of the compressorc. The power required to accomplish the compression (kW)d. The isentropic efficiency of the compressore. An accounting of the exergy entering the compressor (complete Table P3.9) assuming that thedead state is the same as State 1 (dry atmospheric air)f. The exergetic efficiency of the compressor
A single-angle tension member of A36 steel must resist a dead load of 49 kips and a live load of 84 kips. The length of the member is 18 feet, and
it will be connected with a single line of 1-inch-diameter bolts, as shown in the figure below. There will be four or more bolts in this line. For the steel
Fy = 36 ksi and F₁ = 58 ksi. Try the tension members given in the table below.
Tension member
4, (in.)
rz (in.)
7
L6 × 6 ×
9.75
1.17
8
L 5 × 3
×
4.93
0.746
L 5 × 3
×
5
2.56
0.758
16
7
L5 × 3 ×
3.31
0.644
16
Bolt line
a. Select a single-angle tension member to resist the loads. Use LRFD.
A) L 6 × 6 ×
B) L 5 × 3 ×
CL5×3×
D) L 5 × 3 ×
-Select-
5
16
7
16
What is the required gross area?
(Express your answer to three significant figures.)
A₁ =
in.²
What is the required effective area?
(Express your answer to three significant figures.)
A =
in.2
What is the minimum radius of gyration?
(Express your answer to three significant figures.)
"min =
in.
b. Select a single-angle tension member to…
A heat pump is operating between a low temperature reservoir of 270 K and a high temperaturereservoir of 340 K. The heat pump receives heat at 255 K from the low temperature reservoir andrejects heat at 355 K to the high temperature reservoir. The heating coefficient of performance ofthe heat pump is 3.2. The heat transfer rate from the low temperature reservoir is 30 kW. The deadstate temperature is 270 K. Determine,a. Power input to the heat pump (kW)b. Heat transfer rate to the high-temperature reservoir (kW)c. Exergy destruction rate associated with the low temperature heat transfer (kW)d. Exergy destruction rate of the heat pump (kW)e. Exergy destruction rate associated with the high temperature heat transfer (kW)f. Exergetic efficiency of the heat pump itself
Chapter 22 Solutions
Materials Science and Engineering: An Introduction, 10th Edition EPUB Reg (Access) Card and Abridged (Loose-Leaf) Print Companion Set (NEW!!)
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