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Topic: Volumetric efficiency


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  Determining Hydraulic Pump Condition Using Volumetric Efficiency
Volumetric efficiency is the percentage of theoretical pump flow available to do useful work.
For example, a hydraulic pump with a theoretical output of 100 GPM, and an actual output of 94 GPM at 5,000 PSI and 46 cSt is said to have a volumetric efficiency of 94 percent at 5,000 PSI and 46 cSt.
This means that this pump has a volumetric efficiency of 20 percent at 10 percent displacement, 80 percent at 40 percent displacement and 92 percent at 100 percent displacement.
www.machinerylubrication.com /article_detail.asp?articleid=659   (967 words)

  
 Volumetric Diet -- Recommendations and Resources   (Site not responding. Last check: 2007-10-11)
Volumetric efficiencies can be improved in a number of ways, but most notably the size of the valve openings compared to the volume of the cylinder.
A volumetric flask (vol flask for short) is a piece of laboratory glassware used to measure a very precise and accurate amount of a liquid, and is used for such when the amount is too big for a pipette or burette.
Volumetric displays are currently in a prototype phase, with a variety of systems proposed and in use in small quantities mostly in academia and various research labs.
www.becomingapediatrician.com /health/163/volumetric-diet.html   (1481 words)

  
 Erbman's Engine Emporium, Part II
Volumetric efficiency is defined as the ratio of the amount (mass or volume, depending on who you talk to) of fuel/air mixture drawn into a cylinder on the intake stroke to the maximum amount of fuel/air mixture that could be drawn into the cylinder at the intake density.
Alternatively, "Volumetric efficiency is the ratio of the volume of fresh charge taken in during the suction stroke to the full piston displacement.
The biggest factor affecting the volumetric efficiency is the valve timing, specifically the valve overlap angle and the intake valve closing angle.
www.eaa1000.av.org /technicl/engemp/engemp2.htm   (2053 words)

  
 Volumetric Efficiency:  Calculating your cars volumetric efficiency
Volumetric efficiency is the measurement of how close the actual volumetric flow rate is to the theoretical volumetric flow rate.
All of these parts help to increase the volumetric efficiency of the engine and bumps up the power output of the car allowing you to edge ahead of your racing buddy.
The volumetric efficiency is simply the actual volumetric flow rate divided by the theoretical volumetric flow rate multiplied by one hundred.
www.installuniversity.com /install_university/installu_articles/volumetric_efficiency/ve_computation_9.012000.htm   (1220 words)

  
 whats the volumetric efficiency of a tdi engine - TDIClub Forums
The volumetric efficiency of an engine is the ratio of the volume that would be occupied by the air charge at atmospheric temperature and pressure to the cylinder displacement (the product of the area of the bore times the stroke of the piston).
Volumetric efficiency is actually the completeness of filling of the cylinder with fresh air at atmospheric pressure.
The volumetric efficiency of an engine may be increased by enlarging the areas of intake and exhaust valves or ports, and by having all valves properly timed so that as much air as possible will enter the cylinders.
forums.tdiclub.com /showthread.php?p=1501611#post1501611   (1094 words)

  
 Compressor Theory
Referring to the P-V diagram, the suction volumetric efficiency, and the discharge volumetric efficiency,.
The discharge volumetric efficiency (VEd) decreases and can be reduced to a point (especially in high speed machines) where the compressed gas cannot be discharged quickly enough and the valve is forced to close late.
A similar reduction in volumetric efficiency, and therefore in capacity, can be expected on the suction valve when the clearance volume is increased.
www.arielcorp.com /application_manual/arieldbCompressor_Theory.htm   (605 words)

  
 Engine Science, volumetric, thermal and mechanical efficiency
Yet the basic scientific concepts of volumetric efficiency, thermal efficiency and mechanical efficiency and how they relate to engine performance is not well known.
Volumetric efficiency (VE) is used to describe the amount of fuel/air in the cylinder in relation to regular atmospheric air.
Volumetric efficiency identifies how much fuel/air gets into the cylinder and thermal efficiency identifies how much of the fuel gets converted to useable power, but some of this power is robbed by the engine's moving parts.
www.auto-ware.com /combust_bytes/eng_sci.htm   (1098 words)

  
 Power and Efficiency
Volumetric efficiency is a measurement of how well the gas is passed through the engine.
The volumetric efficiency is also affected by the valve timings and these need to be carefully selected and maintained.
The loss of some efficiency due to the increased effort of turning multiple camshafts against more valve springs is offset by the inherent advantages of the overhead cam designs.
www.fordscorpio.co.uk /efficiency.htm   (694 words)

  
 C:\BELLBO~1\COMPUT~1\HTMFILES\00000105.HTM   (Site not responding. Last check: 2007-10-11)
The increase in volumetric efficiency, plotted relative to time in Figure 15b, is plotted relative to power output in Figure 16b.
This efficiency permits the increase in volumetric efficiency because there is less heat to dissipate.
Although the volumetric measures of module area and the size of the cabinet are also important, the amount of heat that the enclosure is capable of dissipating is the most important metric of reliability.
research.microsoft.com /users/gbell/Computer_Engineering/00000105.htm   (314 words)

  
 Variable hydraulic pump efficiency
For example, a hydraulic pump with a theoretical output of 100 GPM, and an actual output of 94 GPM at 5000 PSI and 120 SUS is said to have a volumetric efficiency of 94% at 5000 PSI and 120 SUS.
This means that this pump has a volumetric efficiency of 20% at 10% displacement, 80% at 40% displacement and 92% at 100% displacement.
In considering whether it is necessary to have this hydraulic pump overhauled, the important number is volumetric efficiency at 100% displacement, which is within acceptable limits.
www.insidersecretstohydraulics.com /variable-hydraulic-pump.html   (817 words)

  
 Volumetric Efficiency
The volumetric efficiency of a 4-stroke engine is the relationship between the quantity of intake air and the piston displacement.
In other words, volumetric efficiency is the ratio between the charge that actually enters the cylinder and the amount that could enter under ideal conditions.
Therefore, volumetric efficiency is deter-mined by measuring (with an orifice or venturi type meter) the amount of air taken in by the engine, converting the amount to volume, and comparing this volume to the piston displacement.
www.tpub.com /engine1/en1-105.htm   (261 words)

  
 DragSport.com - DSport Magazine - Tech - Ported & Flowed: Part 2
Volumetric efficiency, or VE for short, is an important term to understand.
The simple ways to improve volumetric efficiency involve eliminating the restrictive components in the path of air flow into the engine and exhaust out of the engine.
All of factors being equal, higher lift camshafts will improve the volumetric efficiency of the engine at all engine speeds (this assumes that the head flows additional air when the valve is opened higher).
www.dragsport.com /issue/2004/0904_tech.shtml   (842 words)

  
 The Intake Cycle Part One
Since the power output of the engine is directly proportional to the amount of air and fuel that it can ingest, the goal is to pack as much mixture as possible into the engine during the intake cycle.
Volumetric efficiency is stated as a percentage of the engines total airflow potential.
A few of the factors that affect the result of increased airflow are; heating of the intake air, pumping losses during the compression and exhaust stroke, and combustion efficiency.
www.yawpower.com /martech.html   (1618 words)

  
 Air amount detector for internal combustion engine - Patent 6662640
The volumetric efficiency is calculated by two-dimensional map having the engine speed and the intake air pressure as parameters thereof.
However, the air amount inside cylinder changes by depending not only on the intake air pressure, but also on volumetric efficiency and an intake air temperature, so that a calculation result of the air amount inside cylinder may have a margin of error due to an influence of a detection error or the like.
In the present invention, a plurality of the calculation maps of the volumetric efficiency may be formed corresponding to the valve timing, while still achieving the object of the present invention sufficiently.
www.freepatentsonline.com /6662640.html   (6048 words)

  
 [No title]   (Site not responding. Last check: 2007-10-11)
With volumetric feeders, which are operated to give equal indicated volume flow rates, the weight flow among burners varies widely.
For a typical cyclone burner type plant with eight feeders and with a mixture of wet and dry coals, the minimum overall excess air requirement of 28 percent is predicted, consistent with 5 percent excess air at the richest burner.
The volumetric efficiency is based on the feeder type, whether table, pocket, belt, or chain.
www.stockequipment.com /solution3.asp   (977 words)

  
 Determining hydraulic pump condition using volumetric efficiency
For example, a pump with a theoretical output of 100 GPM, and an actual output of 94 GPM at 5000 PSI and 120 SUS is said to have a volumetric efficiency of 94% at 5000 PSI and 120 SUS.
In practice, fluid viscosity is established by noting the fluid temperature at which actual output is measured and reading the viscosity off the temperature/viscosity graph for the grade of fluid in the system.
In considering whether it is necessary to have this pump overhauled, the important number is volumetric efficiency at 100% displacement, which is within acceptable limits.
www.preventinghydraulicfailures.com /issue21.html   (1175 words)

  
 FAQ's   (Site not responding. Last check: 2007-10-11)
Volumetric efficiency indicates how efficiently the supercharger breathes and leaks.
A high adiabatic efficiency means the supercharger requires less energy (HP) from the engine to drive it, thereby leaving more engine power for acceleration.
Temperature efficiency is basically the difference between the temperature into the supercharger compared to the discharge air temperature.
www.kennebell.net /faq/faq-answers16(8).htm   (657 words)

  
 A Volumetric Approach to Natural Convection   (Site not responding. Last check: 2007-10-11)
This efficiency is actually a definition and it handles all deviations from the ideal case.
The volumetric efficiency concept can be applied to all kinds of different devises.
A check with in the referenced calculator results in 42 W because the assumed volumetric efficiency was slightly too low.
www.frigprim.com /articels2/parallel_pl.html   (1168 words)

  
 App. E: How to Make a Homemade Piston Pump - Nuclear War Survival Skills
The volumetric and durability tests summarized below are proof that this homemade Plywood Double-Action Piston Pump is better than most hand-cranked centrifugal blowers for supplying a shelter with outdoor air through typical air-intake and exhaust pipes- especially when the ventilation system contains a filter and/or blast valves.
He efficiently moves his body back and forth for over a foot, while moving his hands and forearms horizontally for slightly less than a foot relative to his body.
The volumetric efficiency of a piston pump (a positive displacement pump) is found by dividing the cfm actually pumped by the theoretical maximum cfm at the same pumping rate and the same pressure difference, assuming all piston strokes are full length, that all valves open and close instantaneously, and that there is no leakage.
www.oism.org /nwss/s73p940.htm   (7898 words)

  
 Volumetric Efficiency of Gear Pumps
The factor DP / (N*µ) is a function only of the operating conditions of the pump, which means that the volumetric efficiency of a gear pump depends on how the pump is used.
The efficiency expression as presented in equation #2.0 is an approximation, which assumes that there is a linear relationship between the pump efficiency and the factor DP / (N*µ).
The pump efficiency constant can be determined empirically from laboratory test data running the pump at various values of DP / (N*µ) and using two or three fluids of different viscosities.
www.zenithpumps.com /applications/vol.htm   (688 words)

  
 Rotary Filling Machines | Rotary Fillers | Rotary Capping Machinery | Rotary Filling Equipment | Rotary Filling Systems ...
Most replacement parts are stocked and they can be shipped within 24 hours of your order being placed.
Biner Ellison engineers are constantly working to modernize and simplify our designs giving our customers the competitive edge for the most efficient, technologically advanced bottling line.
The RVF Series is an impressive line that provides precise volumetric filling of viscous and semi-viscous products utilizing our proven “time and flow” metering system.
www.binerellison.com   (1187 words)

  
 Best of Kit Tech   (Site not responding. Last check: 2007-10-11)
Cambridge, MA Volumetric efficiency (VE) is expressed as the percentage of the amount of air actually used by the engine compared to the volume of the cylinder.
The formula for this would be the actual cfm divided by the theoretical cfm times 100, which equals the volumetric efficiency.
Dividing 300 by 349 cfm and multiplying it by 100 equals 85.9 percent volumetric efficiency.
www.kitcarmag.com /techfaq/26104   (4205 words)

  
 Power Technology - Compressor Efficiency Definitions
There are many different compressor efficiency definitions in use by the compressor industry, which can cause confusion when comparing compressors.
Below are brief descriptions of the volumetric efficiency, specific overall adiabatic efficiency, and system efficiency, which Vairex currently uses in specifications.
For a more complete explanation of these efficiencies and their derivation, please download the attached white paper on the subject.
www.power-technology.com /papers/fuel/vairex/paper1.html   (146 words)

  
 Hydraulic Multimeters offer flow ranges of 100 or 200 gpm., Webster Instruments
Volumetric efficiency is automatically calculated and displayed by setting baseline flow and pressure point and increasing system pressure with bi-directional loading valve.
The DHM builds on a proven design by providing digital readout of pressure, peak pressure, volumetric efficiency and hydraulic horsepower in addition to flow rate, and fluid temperature.
Pump volumetric efficiency is automatically calculated & displayed by setting a baseline flow and pressure point and then increasing system pressure with the loading valve.
news.thomasnet.com /fullstory/465570/rss/2697   (729 words)

  
 Engine Dynamics
In this section, we will look into three engine efficiency topics: Volumetric Efficiency, Thermal Efficiency and Mechanical Efficiency.
Volumetic Efficiency or VE, I will be using from this point, varies depending on temperature and pressure.
You can see the key to increase engine flow is to increase engine VE (volumetric efficiency).
members.tripod.com /~cherrypicker/id2.html   (484 words)

  
 Engine & fuel engineering - Volumetric Efficiency
My understanding of VE is quite simple, it is the ratio of the mass of air drawn into the cylinder on one induction stroke vs the mass of air equal to the volume of the displacement of the cylinder with the air at ambient density.
You will have 100% volumetric efficiency if you, have the engine stopped and the intake valve is open, or if it has set long enough for the air to equalize.
Czero, if you are so in the dark as to what Volumetric Efficiency is, I suggest you do a little research before trying to tackle any kind of turbo setup on your engine.
www.eng-tips.com /viewthread.cfm?qid=93258   (1018 words)

  
 Ignition Advance Curve Requirements
The major factors affecting ignition timing requirement are volumetric efficiency, engine speed and burn rate.
Volumetric efficiency, or VE, is an expression of how much of a lung full a cylinder gets for each breath.
As Volumetric Efficiency increases, advance decreases, but because flame speed is finite, it must be initiated much earlier with increasing speed
www.jcna.com /library/tech/tech0013.html   (1350 words)

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