handbook of mechanical engineering
Handbook of Mechanical Engineering Calculations P1
Ngày tải lên :
09/11/2013, 04:15
... given at the website.
Source: HANDBOOK OF MECHANICAL ENGINEERING CALCULATIONS
1.10
POWER GENERATION
from the steam bottoming cycle. For this study, two types of supplementary firing
are considered—(1) ... and off-design performance of
an HRSG, such as that in Fig. 16, under different conditions of exhaust flow, tem-
perature, and auxiliary firing without delving into the mechanical design aspects of
tube ... bled
ϭ
(H
6
Ϫ
H
5
)/(H
2
Ϫ
H
5
)
ϭ
(196.15/1107.9)
ϭ
0.1771, or 17.71 percent.
2. Find the amount of heat converted to work per pound (kg) of throttle steam
(b) The amount of heat converted to work per pound (kg) of throttle steam
ϭ
(H
1
Ϫ
H
2
)
ϩ
(1
Ϫ
0.1771)(H
g
Ϫ
H
4
)
ϭ
467.3...
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Handbook of Mechanical Engineering Calculations P2
Ngày tải lên :
09/11/2013, 04:15
... (0.28 kg) of water per pound (kg) of dry air. Since the water
content of the air is a function of the partial pressures, (0.622) (0.5067) /[(2
ϫ
0.5067)]
ϭ
0.673 lb of water per lb of dry air ... a capacity of 8000 gal (30,280.0 L), and the steam space
has a capacity of 30,000 gal (113,550.0 L) of water.
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com)
Copyright ... the quantity of steam, lb
m
/h (kg/h), lost from the
condenser.
Calculation Procedure:
1. Compute the mass rate of flow per hour of the air leakage
The mass rate of flow per hour of the estimated...
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Tài liệu Handbook of Mechanical Engineering Calculations P3 pdf
Ngày tải lên :
17/12/2013, 11:15
... combustion
and increases the weight of the products of combustion per pound (kilogram) of
coal burned. Therefore, the weight of the products of combustion is the sum of the
weight of the combustion products ... cu m) of natural gas; 1300 cu ft
of air (36.8 cu m) per gal (0.003785 cu m) of No. 2 fuel oil; 1450 cu ft of air (41
cu m) per gal of No. 5 fuel oil; 1500 cu ft of air (42.5 cu m) per gal of No. ... combustion of 1 lb (0.45 kg) of coal
ϭ
sum of nitrogen
and oxygen required
ϭ
8.4228
ϩ
2.5444
ϭ
10.9672 lb (4.975 kg) of air per pound
(kilogram) of coal burned.
3. Compute the weight of the products of...
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Tài liệu Handbook of Mechanical Engineering Calculations P4 pptx
Ngày tải lên :
17/12/2013, 11:15
... M
ƒ
ϭ
lb of moisture per lb fuel
burned; M
a
ϭ
lb of moisture per lb of dry air to furnace; C
b
ϭ
lb of carbon burned
per lb of fuel burned
ϭ
C
ϭ
RC
r
; C
r
ϭ
lb of combustible per lb of refuse; ... velocity of 4400 ft /min
(22.4 m /s), an outlet velocity pressure of 1.210 inH
2
O (0.30 kPa), a speed of 1222
r/ min, and an input hp of 255.5 bhp (190.5 kW). The tabulation of these quantities
is of ... lb of refuse; R
ϭ
lb
of refuse per lb of fuel; H
2
,N
2
,C,O
2
,S
ϭ
lb of each element per lb of fuel, as
fired; CO
2
, CO, O
2
,N
2
ϭ
percentage parts of volumetric analysis of dry combustion
gas...
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Tài liệu Handbook of Mechanical Engineering Calculations P5 pdf
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17/12/2013, 11:15
... Terms of Use as given at the website.
Source: HANDBOOK OF MECHANICAL ENGINEERING CALCULATIONS
5.4
POWER GENERATION
m) are used. Use the Standards of the Bleeder Heater Manufacturers Association,
Inc., ... conditions of 1800 psia (12,402 kPa) and 1050
Њ
F
(565.6
Њ
C). At exit from the cylinder the steam has a pressure of 500 psia (3445
kPa) and a temperature of 740
Њ
F (393.3
Њ
C). A portion of this ... more heaters. Plot the percent
improvement vs. number of stages of extraction, Fig. 6, to observe the effect of
additional heaters. A plot of this type shows the decreasing gains made by addi-
tional...
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Tài liệu Handbook of Mechanical Engineering Calculations P6 pdf
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17/12/2013, 11:15
... (www.digitalengineeringlibrary.com)
Copyright © 2006 The McGraw-Hill Companies. All rights reserved.
Any use is subject to the Terms of Use as given at the website.
Source: HANDBOOK OF MECHANICAL ENGINEERING ... introduced every
year.
*Elliott, Standard Handbook of Power Plant Engineering, McGraw-Hill, 1989.
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com)
Copyright ... quantity of dust entering the engine
Each 1000 ft
3
(28.3 m
3
) of air entering the engine contains 1.6 gr (103.7 mg) of
dust. Thus, during every minute of engine operation, the quantity of dust...
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Tài liệu Handbook of Mechanical Engineering Calculations P7 docx
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17/12/2013, 11:15
... this handbook.
Once the required flow rate is determined, apply a suitable factor of safety. The
value of this factor of safety can vary from a low of 5 percent of the required flow
to a high of ... reserved.
Any use is subject to the Terms of Use as given at the website.
Source: HANDBOOK OF MECHANICAL ENGINEERING CALCULATIONS
7.38
PLANT AND FACILITIES ENGINEERING
FIGURE 23 Negative lift (gravity ... pumps
are generally used.
Mechanical seals are becoming more popular for all types of centrifugal pumps
in a variety of services. Although they are more costly than packing, the mechanical
seal reduces...
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Tài liệu Handbook of Mechanical Engineering Calculations P8 doc
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17/12/2013, 11:15
... velocity of a
flowing fluid is changed by opening or closing a valve, pressure surges result. The
amplitude of the pressure surge is a function of the rate of change in the velocity
of the mass of fluid. ... factor of 2 for traps installed between a
boiler and the end of a steam main; traps at the end of a long steam main or ahead
of pressure-regulating or shutoff valves usually have a safety factor of ... and King—Piping Handbook
for derivation of the flow equations. Use the tables in Crocker and King to simplify
finding the fifth power of the inside diameter of a pipe. The method of the next
calculation...
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- 0
Tài liệu Handbook of Mechanical Engineering Calculations P9 pdf
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17/12/2013, 11:15
... (www.digitalengineeringlibrary.com)
Copyright © 2006 The McGraw-Hill Companies. All rights reserved.
Any use is subject to the Terms of Use as given at the website.
Source: HANDBOOK OF MECHANICAL ENGINEERING ... (339.6 m
3
/min) of
air at a pressure of 14 lb/in
2
(abs) (96.46 kPa) and a temperature of 60
Њ
F (15.6
Њ
C).
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com)
Copyright ... cool-
ing effectiveness of both types of towers are about equal. Data given on cooling
towers elsewhere in this handbook can be helpful to the designer in choosing the
best type of tower to use for...
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Tài liệu Handbook of Mechanical Engineering Calculations P11 doc
Ngày tải lên :
17/12/2013, 11:15
... website.
Source: HANDBOOK OF MECHANICAL ENGINEERING CALCULATIONS
11.2
TABLE 1
Heat-Exchanger Selection Guide*
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com)
Copyright ... heat H
m
Btu required to melt a solid is H
m
ϭ
(weight of solid melted, lb)(heat
of fusion of the solid, Btu /lb). Since the heat of fusion of lead is 10 Btu/ lb (23.2
kJ/kg), H
m
ϭ
(600)(10)
ϭ
6000 ... No
What number of tubeside passes are
available?
Number limited
by number of
tubes
Number limited by
number of U-
tubes
Number limited by
number of tubes
One or two Number limited by
number of
tubes.
Odd...
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Tài liệu Handbook of Mechanical Engineering Calculations P12 pdf
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17/12/2013, 11:15
... Terms of Use as given at the website.
REFRIGERATION
12.28
PLANT AND FACILITIES ENGINEERING
This procedure is the work of Norman R. Sparks, Professor and Head, Depart-
ment of Mechanical Engineering, ... Professor of Mechanical Engi-
neering, The Pennsylvania State University. SI values were added by the handbook
editor.
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com)
Copyright ... the
heat-transfer characteristics of the dehumidifier used.
This procedure, and Figs. 9 through 12, are the work of Norman R. Sparks,
Professor and Head, Department of Mechanical Engineering, The Pennsylvania
State...
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Tài liệu Handbook of Mechanical Engineering Calculations P13 doc
Ngày tải lên :
25/12/2013, 23:18
... percent of the average
annual demand but may range up to 200 percent of the average annual demand.
Maximum daily demands of 150 percent of the average annual demand and max-
imum hourly demands of ... effluent
wastewater is to have a BOD
5
of 20 mg/L. Both filters are to have a depth of 7
feet (2.1 m) and a recirculation ratio of 2. Filter media will consist of rock. Size
both stages of the trickling filter ... ft
3
/Mgal (3.74 to 201.9 m
3
/L) of flow. Assume
a value of 20 ft
3
/Mgal (149.5 m
3
/L). Therefore, the average quantity of grit ex-
pected is:
33 33
Volume of grit (ft / d)
ϭ
(20 ft / Mgal)(4.0...
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Tài liệu Handbook of Mechanical Engineering Calculations P14 pptx
Ngày tải lên :
25/12/2013, 23:18
... (304.8-m) lengths
of various sizes of pipe and for different values of the Hazen-Williams coefficient
C. When the percentage of total flow is used for computing
͚
h in Fig. 11, the loss
of head due to ... imperviousness of 50 percent if the time of concentration is 15 min? What would
be the effect of planting a lawn over 75 percent of the site?
Calculation Procedure:
1. Compute the hourly rate of rainfall
Two ... sewer,
acres; I
ϭ
coefficient of runoff or percentage of imperviousness of the area; other
symbols as before. So Q
ϭ
(40)(0.50)(8)
ϭ
160 ft
3
/s (4.5 m
3
/s).
3. Compute the effect of changed imperviousness
Planting...
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Tài liệu Handbook of Mechanical Engineering Calculations P15 docx
Ngày tải lên :
25/12/2013, 23:18
... Heating Values of Commercial Gases
TABLE 21
Capacities of Gas Pipes [Losses of pressure are shown in inches of water per
100 ft (millimeters per 30.4 m) of pipe, due to the flow of gas with a specific ... size for each roof
Decide whether the small roof area, i.e., the machinery room roof, will be drained
by separate leaders to the ground or to the main roof area. If the small roof area
is drained ... given at the website.
Source: HANDBOOK OF MECHANICAL ENGINEERING CALCULATIONS
PLUMBING AND DRAINAGE FOR BUILDINGS AND OTHER STRUCTURES
15.35
TABLE 13
Demand Weight of Fixtures in Fixture Units
Њ
FIGURE...
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Tài liệu Handbook of Mechanical Engineering Calculations P16 doc
Ngày tải lên :
25/12/2013, 23:19
... type of fuel, oil, gas, coal, etc., can be used
for the structure.
This procedure is the work of Jerome F. Mueller, P.E. of Mueller Engineering
Corp.
HEAT RECOVERY USING A RUN-AROUND
SYSTEM OF ... McClure & Associates, and Affiliate Professor of Mechanical Engineering,
Washington University, as reported in HPAC Magazine. SI values were added by
the handbook editor.
Additional design pointers ... gallons per minute
*Handbook of Air-Conditioning System Design, McGraw-Hill, New York, various dates.
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com)
Copyright...
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