handbook of mechanical engineering

... and off-design performance of an HRSG, such as that in Fig 16, under different conditions of exhaust flow, perature, and auxiliary firing without delving into the mechanical design aspects oftube ... rate by 1 percent Although the capacity of the absorption cooling system’s cooling-water loopmust be twice that of the mechanical chiller’s, the size of the plant’s overall heatsink is identical—25 ... nonhalogenated materials, will be phasedout by the end of the decade because of environmental considerations (destruction of the ozone layer) Use of nonhalogenated refrigerants is expected to increase

Ngày tải lên: 09/11/2013, 04:15

... Conveyors of this capacity of the conveyor decreases as the angle of inclination is increased Thus h) of various classes of materials at the maximum recommended shaft rpm As thesize of the lumps ... Plan of conveyor layout (b) Elevation of conveyor layout.2. Determine the path of the conveyor on a scaled plant layout Draw a plan and elevation of the conveyor, Fig 1, on a scaled layout of the ... environmental and safety aspects of engineering cisions, it is wise for the design engineer to refer to the appropriate codes andspecifications governing the particular type of equipment being considered

Ngày tải lên: 02/07/2014, 12:20

... because much of the equipment(such as computers and instruments) cost about the same regardless of price.This procedure is the work of Donald S Remer, Oliver C Field Professor ofEngineering, ... including mechanical, civil, electrical, chem-ical, industrial, architectural, sanitary, nuclear, and control engineering Today anumber of engineering schools are offering a major in environmental engineering.Graduates ... time ofconstruction of the first plant and today Calculation Procedure: 1. Estimate the cost of the new plant using the R-factor method The R-factor method permits quick estimates of the cost of

Ngày tải lên: 02/07/2014, 12:20

... is the work of Richard J Derks, Assistant Professor of ical Engineering, University of Notre Dame, formerly Design Engineer, Twin Disc Mechan-Clutch Company, as reported in Product Engineering. ... Data on the coefficient of friction is available in standard handbooks.Figure 15 shows a typical plot of the coefficient of friction for journal bearings.The coefficient of friction chose for a ... frequent source of trouble in thebearings Improper selection of sheaves and arrangement of connections can result in poor bearing life and early shaft breakage A thorough analysis of bearing loadsand

Ngày tải lên: 02/07/2014, 12:20

... s) of 3⫻109Btu/ yr (3.17 kJ⫻109/ yr) an initial cost for the total system of $503,000 based on a collector area (A c) of 10,060 ft2(934.6 m2), a depreciation life (DP) of 12 yr, a taxrate (␶) of ... factor (TC) of 0.25, a system life of 20 yr, an operating cost fraction (OMPI) of 0.0250, an initial fuel cost (P f 0) of $3.11 / MBtu ($3.11 / 947.9 MJ) and a fuel price escalation rate (e) of 0.1450. ... plant as a supplemental source ofsteam However, use of this boiler is limited to 25 percent of the time by federalregulations This boiler serves as a backup in the event of rain, for night productionwhen

Ngày tải lên: 25/12/2013, 23:19

... cast iron, plastic, etc di-Hollow shafts often find favor today in an environmentally conscious designworld Thus, Richard M Phelan, Professor of Mechanical Engineering, CornellUniversity, writes: ... the factor of safety for both types of stresses The factor of safety⫽allowable stress / actual stress For shear, factor of safety, F s ⫽50,000 / 7000 ⫽7.14 For crushing, the factor of safety, ... for rotatingshafts made of any of the popular materials: steel, cast iron, aluminum, plastic, etc.Recommended dimensions of various types of shaft keys can be obtained fromhandbooks listed in the

Ngày tải lên: 25/12/2013, 23:19

... idler—i.e., thespeed of the driving and driven gears remains the same, regardless of the number of idlers used 4. Determine the direction of rotation of the gears Where an odd number of gears are used ... One of the gears is driven by another gear; the second gear of the compound set drives another gear In acompound gear train, the product of the number of teeth of the driving gears andthe rpm of ... Determine the effect of one idler gear An idler gear has no effect on the speed of the driving or driven gear Thus, the speed of each gear would remain the same, regardless of the number of teeth in Trang

Ngày tải lên: 25/12/2013, 23:19

... orsteel plates This procedure is the work of Richard M Phelan, Associate Professor of chanical Engineering, Cornell University SI values were added by the handbookeditor Me-CLUTCH SELECTION FOR ... protect the gears and other parts of the drive Space limitations dictate an upper limit of 4 in (10.2 cm) and a lowerlimit of 2.5 in (6.35 cm) for the diameters of the friction surfaces The clutch ... based on manufacturer’s catalog data Manufacturers often list the dynamic load of a nut or screw for an L10 life of 1million revolutions Total life of the screw is: l Lrev⫽冉 冊l t t t h h d y s where

Ngày tải lên: 25/12/2013, 23:19

... 2.3 Determine (a) mean diameter of coil; (b) diameter of wire; (c) length of coil when closed, and (d ) length of coil before load application Use G⫽rigiditymodulus of steel in shear⫽11.5 ⫻106(79,235 ... GPa) Find the diameter of the wire, helix radius,and number of active coils for the smallest amount of material in the spring Calculation Procedure: 1. Find the diameter of the spring wire A spring ... Calculations. Because of the many variables involved, the ing of a helical spring is usually done by trial and error An unlimited number ofsprings can be obtained that will satisfy a given set of equations

Ngày tải lên: 23/01/2014, 05:20

... Doughtie, Professor of Mechanical Engineering, University of Texas DESIGNING A BRAKE AND ITS ASSOCIATED MECHANISMS Design a hoist for the building industry to lift a cubic yard (0.76 m3) of concrete ... the moving parts of the brake and load as a guide to the relative magnitude of load inertia The method presented is the work of Joseph F Peck, reported in Product Engineering. MECHANICAL BRAKE ... load of 6000 lb (2724 kg) using a band brake, Fig 1, having a 48-in (121.9-cm) drum diameter and a drum width of 8-in (20.3-cm) The brake band width is 6-in (15.2-cm) with an arc of contact of

Ngày tải lên: 23/01/2014, 05:20

... Speed of response of thesevalves is important during the design and operation of any hydraulic system Theprocedure given here analyzes the speed of response of a typical valve in terms ofthe ... through the ejection of dashpot oil Hence, the kinetic energy of the moving parts equals the work done during penetration of the dashpot The assumed value of the coefficient of discharge, C D, may ... an earlier section of this handbook todetermine the required size of the connecting tubing appli-The procedure presented above is the work of Wes Master, reported in Product Engineering. HYDRAULIC

Ngày tải lên: 23/01/2014, 05:20

... edge⫽(cost of insert) / [(number of regrinds per insert)(number of edges per grind)]⫹(cost ofholder or head) / [(number of in life of holder or head)(number of regrinds per insert)(number of edges ... standard time of X, min)(number of pieces)⫹(setup time of X, min)⫽(unit standard time of Y, min)(number of pieces) ⫹(setup time of Y, min) For these two machines, since the number of pieces Z is ... DIMENSIONS OF TAPER AND DOVETAILS What are the taper per foot (TPF) and taper per inch (TPI) of an 18-in (45.7-cm) long part having a large diameter d l of 3 in (7.6 cm) and a small diameter of d sof1.5

Ngày tải lên: 23/01/2014, 05:20

... concentration of oxygen at the head Head Coated alloy Tail X Front of head Back of head Direction of propagation Illustration of the filament nature of filiform corrosion. Trang 6of the filament ... the head of the corrosion filament (Fig 1.11) For iron, pH values at the front of the head of 1 to 4 and a potential of close to 0.44 V (SHE) have been reported In contrast, at the back of the ... par-ticular, the pH of such microenvironments tends to be very acidic The formation of acidified microenvironments is related to the hydrolysis of corrosion products and the formation of differential

Ngày tải lên: 22/12/2013, 23:17

... Trang 1Handbook ofCorrosion Engineering Trang 2Library of Congress Cataloging-in-Publication DataRoberge, Pierre R. Handbook of Corrosion Engineering / Pierre R Roberge. ... collective efforts of many authors, the Handbook of Corrosion Engineering is the result of an extensive survey of state-of-the-art information on corrosion engineering by a principal author.Although ... this Handbook isindeed the result of cumulative efforts of many generations of scien-tists and engineers in understanding and preventing the effects of cor-rosion, one of the most constant foes of

Ngày tải lên: 22/12/2013, 23:17

... (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...

Ngày tải lên: 09/11/2013, 04:15

... 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...

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...

Ngày tải lên: 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...

Ngày tải lên: 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...

Ngày tải lên: 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...

Ngày tải lên: 17/12/2013, 11:15