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| [[File:Small stationary Bauer HP compressor installation DSC09403.JPG|thumb|A small stationary high pressure breathing air compressor for filling scuba cylinders]]
| | Man or woman who wrote the is called Eusebio. His friends say it's unhealthy for him but the text he loves doing is acting and he's has been doing it for many years. Filing has been his profession although. Massachusetts has always been his located place and his wife and kids loves it. Go to his website to find out more: http://circuspartypanama.com<br><br>Here is my web blog [http://circuspartypanama.com how to hack clash of clans] |
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| A '''gas compressor''' is a mechanical device that increases the [[pressure]] of a [[gas]] by reducing its [[volume]]. An [[air compressor]] is a specific type of gas compressor.
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| Compressors are similar to [[pump]]s: both increase the pressure on a [[fluid]] and both can transport the fluid through a [[pipe (material)|pipe]]. As gases are compressible, the compressor also reduces the volume of a gas. Liquids are relatively incompressible; while some can be compressed, the main action of a pump is to pressurize and transport liquids.
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| ==Types of compressors==
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| The main types of gas compressors are illustrated and discussed below:
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| [[File:Gas-compressors-types-yed.png|frame|center]]
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| ===Centrifugal compressors===
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| [[File:CentrifugalCompressor.jpg|thumb|right|Figure 1: A single stage centrifugal compressor]]
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| {{main|Centrifugal compressor}}
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| '''Centrifugal compressors''' use a rotating disk or [[impeller]] in a shaped housing to force the gas to the rim of the impeller, increasing the velocity of the gas. A diffuser (divergent duct) section converts the velocity energy to pressure energy. They are primarily used for continuous, stationary service in industries such as [[oil refinery|oil refineries]], [[chemical plant|chemical]] and [[petrochemical]] plants and [[natural gas processing]] plants.<ref name=Perry >{{cite book
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| |author=Perry, R.H. and Green, D.W. (Editors)
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| |title=[[Perry's Chemical Engineers' Handbook]]
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| |edition=8th|publisher=McGraw Hill
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| |year=2007
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| |isbn=0-07-142294-3
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| }}</ref><ref>{{cite book|author=Dixon S.L.
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| |title=Fluid Mechanics, Thermodynamics of Turbomachinery
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| |edition=Third
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| |publisher=Pergamon Press
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| |year=1978|isbn=0-08-022722-8
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| }}</ref><ref>{{cite book
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| |author=Aungier, Ronald H.
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| |title=Centrifugal Compressors A Strategy for Aerodynamic design and Analysis
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| |publisher=[[ASME]] Press
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| |year=2000
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| |isbn=0-7918-0093-8
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| }}</ref> Their application can be from {{convert|100|hp|kW}} to thousands of horsepower. With multiple staging, they can achieve high output pressures greater than {{convert|10000|psi|MPa|abbr=on}}.
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| Many large [[snowmaking]] operations (like [[ski resorts]]) use this type of compressor. They are also used in internal combustion engines as [[supercharger]]s and [[turbocharger]]s. Centrifugal compressors are used in small [[gas turbine]] [[engine]]s or as the final compression stage of medium sized gas turbines.
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| ===Diagonal or mixed-flow compressors===
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| {{main|Diagonal or mixed-flow compressor}}
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| '''Diagonal''' or '''mixed-flow compressors''' are similar to centrifugal compressors, but have a radial and axial velocity component at the exit from the rotor. The diffuser is often used to turn diagonal flow to an axial rather than radial direction.
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| ===Axial-flow compressors===
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| [[File:Axial compressor.gif|thumb|right|An animation of an axial compressor.]]
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| {{main|Axial-flow compressor}}
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| '''Axial-flow compressors''' are dynamic rotating compressors that use arrays of fan-like [[airfoil]]s to progressively compress the working fluid. They are used where there is a requirement for a high flow rate or a compact design.
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| The arrays of airfoils are set in rows, usually as pairs: one rotating and one stationary. The rotating airfoils, also known as blades or ''rotors'', accelerate the fluid. The stationary airfoils, also known as ''stators'' or vanes, decelerate and redirect the flow direction of the fluid, preparing it for the rotor blades of the next stage.<ref name=Perry /> Axial compressors are almost always multi-staged, with the cross-sectional area of the gas passage diminishing along the compressor to maintain an optimum axial [[Mach number]]. Beyond about 5 stages or a 4:1 design pressure ratio, [[variable geometry]] is normally used to improve operation.
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| Axial compressors can have high efficiencies; around 90% [[polytropic]] at their design conditions. However, they are relatively expensive, requiring a large number of components, tight tolerances and high quality materials. Axial-flow compressors can be found in medium to large [[gas turbine]] engines, in natural gas pumping stations, and within certain chemical plants.
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| ===Reciprocating compressors===
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| {{main|Reciprocating compressor}}
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| [[File:ReciprocatingCompressor.jpg|right|thumb|A motor-driven six-cylinder reciprocating compressor that can operate with two, four or six cylinders.]]
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| '''Reciprocating compressors''' use [[piston]]s driven by a crankshaft. They can be either stationary or portable, can be single or multi-staged, and can be driven by electric motors or internal combustion engines.<ref name=Perry /><ref>{{cite book
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| |authors=Bloch, H.P. and Hoefner, J.J.
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| |title=Reciprocating Compressors, Operation and Maintenance
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| |publisher=Gulf Professional Publishing
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| |year=1996
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| |isbn=0-88415-525-0
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| }}</ref><ref>[http://www.machinerylubrication.com/article_detail.asp?articleid=775&pagetitle=Reciprocating%20Compressor%20Basics Reciprocating Compressor Basics] Adam Davis, Noria Corporation, ''Machinery Lubrication'', July 2005</ref> Small reciprocating compressors from 5 to 30 [[horsepower]] (hp) are commonly seen in automotive applications and are typically for intermittent duty. Larger reciprocating compressors well over {{convert|1000|hp|abbr=on}} are commonly found in large industrial and petroleum applications. Discharge pressures can range from low pressure to very high pressure (>18000 psi or 180 MPa). In certain applications, such as air compression, multi-stage double-acting compressors are said to be the most efficient compressors available, and are typically larger, and more costly than comparable rotary units.<ref>[http://www.thomasnet.com/articles/machinery-tools-supplies/Industrial-Compressed-Air-Systems Introduction to Industrial Compressed Air Systems]</ref>
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| Another type of reciprocating compressor is the swash plate compressor, which uses pistons moved by a swash plate mounted on a shaft (see ''[[axial piston pump]]'').
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| Household, home workshop, and smaller job site compressors are typically reciprocating compressors 1½ hp or less with an attached receiver tank.
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| ====Ionic liquid piston compressor====
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| {{main|Ionic liquid piston compressor}}
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| An [[ionic liquid piston compressor]], ''ionic compressor'' or ''ionic liquid piston pump'' is a [[hydrogen compressor]] based on an [[ionic liquid]] piston instead of a metal piston as in a piston-metal [[diaphragm compressor]].<ref>[http://www.intermediates.basf.com/chemicals/web/en/function/conversions:/publish/images/products-and-industries/ionic-liquids/Achema_News_01_08.pdf New developments in pumps and compressors using Ionic Liquids]</ref>
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| ===Rotary screw compressors===
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| [[File:RotaryScrewCompressor.gif|thumb|right|Diagram of a rotary screw compressor]]
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| {{main|Rotary screw compressor}}
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| '''Rotary screw compressors''' use two meshed rotating positive-displacement [[Helix|helical screws]] to force the gas into a smaller space.<ref name=Perry/><ref>[http://www.blackmer.com/tech-screw.jsp Screw Compressor] Describes how screw compressors work and include photographs.</ref><ref>[http://www.domnickhunter.com/tech_Centre.asp?chapter=1§ion=3_Screw-Compressors_2_3.htm&getIndex=false Technical Centre] Discusses oil-flooded screw compressors including a complete system flow diagram</ref> These are usually used for continuous operation in commercial and industrial applications and may be either stationary or portable. Their application can be from {{convert|3|hp|kW}} to over {{convert|1200|hp|kW}} and from low pressure to moderately high pressure (>{{convert|1200|psi|MPa|1|abbr=on|disp=or}}).
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| Rotary screw compressors are commercially produced in Oil Flooded, Water Flooded and Dry type.
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| ===Rotary vane compressors===
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| {{See also|Rotary vane pump}}
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| '''Rotary vane compressors''' consist of a rotor with a number of blades inserted in radial slots in the rotor. The rotor is mounted offset in a larger housing that is either circular or a more complex shape. As the rotor turns, blades slide in and out of the slots keeping contact with the outer wall of the housing.<ref name=Perry/> Thus, a series of decreasing volumes is created by the rotating blades. Rotary Vane compressors are, with piston compressors one of the oldest of compressor technologies.
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| With suitable port connections, the devices may be either a compressor or a vacuum pump. They can be either stationary or portable, can be single or multi-staged, and can be driven by electric motors or internal combustion engines. Dry vane machines are used at relatively low pressures (e.g., {{convert|2|bar|kPa psi|abbr=on|disp=or}}) for bulk material movement while oil-injected machines have the necessary volumetric efficiency to achieve pressures up to about {{convert|13|bar|kPa psi|abbr=on}} in a single stage. A rotary vane compressor is well suited to electric motor drive and is significantly quieter in operation than the equivalent piston compressor.
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| Rotary vane compressors can have mechanical efficiencies of about 90%.<ref>[http://www.matteicomp.com/compressor-news.htm?id=165176063 Mattei Compressors]</ref>
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| ===Scroll compressors===
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| [[File:Two moving spirals scroll pump.gif|thumb|right|Mechanism of a scroll pump]]
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| {{main|Scroll compressor}}
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| A '''scroll compressor''', also known as '''scroll pump''' and '''scroll vacuum pump''', uses two interleaved spiral-like vanes to [[pump]] or compress [[fluid]]s such as [[liquids]] and [[gas]]es. The vane geometry may be [[involute]], [[archimedean spiral]], or hybrid curves.<ref>Tischer, J., Utter, R: “Scroll Machine Using Discharge Pressure For Axial Sealing,” U.S. Patent 4522575, 1985.</ref><ref>Caillat, J., Weatherston, R., Bush, J: “Scroll-Type Machine With Axially Compliant Mounting,” U.S. Patent 4767293, 1988.</ref><ref>Richardson, Jr., Hubert: “Scroll Compressor With Orbiting Scroll Member Biased By Oil Pressure,” U.S. Patent 4875838, 1989.</ref> They operate more smoothly, quietly, and reliably than other types of compressors in the lower volume range.
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| Often, one of the scrolls is fixed, while the other orbits eccentrically without rotating, thereby trapping and pumping or compressing pockets of fluid or gas between the scrolls.
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| Due to minimum clearance volume between the fixed scroll and the orbiting scroll, these compressors have a very high volumetric efficiency.
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| This type of compressor was used as the [[G-Lader|supercharger]] on Volkswagen G60 and G40 engines in the early 1990s.
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| ===Diaphragm compressors===
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| {{main|Diaphragm compressor}}
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| A '''diaphragm compressor''' (also known as a '''membrane compressor''') is a variant of the conventional reciprocating compressor. The compression of gas occurs by the movement of a flexible membrane, instead of an intake element. The back and forth movement of the membrane is driven by a rod and a crankshaft mechanism. Only the membrane and the compressor box come in contact with the gas being compressed.<ref name=Perry/>
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| The degree of flexing and the material constituting the diaphragm affects the maintenance life of the equipment. Generally stiff metal diaphragms may only displace a few cubic centimeters of volume because the metal can not endure large degrees of flexing without cracking, but the stiffness of a metal diaphragm allows it to pump at high pressures. Rubber or silicone diaphragms are capable of enduring deep pumping strokes of very high flexion, but their low strength limits their use to low-pressure applications, and they need to be replaced as plastic embrittlement occurs.
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| Diaphragm compressors are used for hydrogen and compressed natural gas ([[Compressed natural gas|CNG]]) as well as in a number of other applications.
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| [[File:DiaphragmCompressor.jpg|thumb|right|A three-stage diaphragm compressor]]
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| The photograph included in this section depicts a three-stage diaphragm compressor used to compress [[hydrogen]] gas to {{convert|6000|psi|MPa|abbr=on}} for use in a prototype [[compressed hydrogen]] and [[compressed natural gas]] (CNG) fueling station built in downtown [[Phoenix, Arizona]] by the [[Arizona Public Service]] company (an electric utilities company). [[Reciprocating compressor]]s were used to compress the [[natural gas]].
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| The prototype [[alternative fuel]]ing station was built in compliance with all of the prevailing safety, environmental and building codes in Phoenix to demonstrate that such fueling stations could be built in urban areas.
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| ===Air bubble compressor===
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| Also known as a [[trompe]]. A mixture of air and water generated through turbulence is allowed to fall into a subterranean chamber where the air separates from the water. The weight of falling water compresses the air in the top of the chamber. A submerged outlet from the chamber allows water to flow to the surface at a lower height than the intake. An outlet in the roof of the chamber supplies the compressed air to the surface. A facility on this principal was built on the [[Montreal River (Timiskaming District)|Montreal River]] at Ragged Shutes near [[Cobalt, Ontario]] in 1910 and supplied 5,000 horsepower to nearby mines.<ref>{{cite journal|last=Maynard|first=Frank|date=November 1910|title=Five thousand horsepower from air bubbles|journal=Popular Mechanics|pages=Page 633|url=http://books.google.com/?id=-N0DAAAAMBAJ&printsec=frontcover#v=onepage&q&f=false}}</ref>
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| ===Hermetically sealed, open, or semi-hermetic===
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| [[File:Lednička Zanussi ZRA 319 SW, kompresor s odpařovací miskou (002).JPG|thumb|A small hermetically sealed compressor in a common consumer [[refrigerator]] or [[freezer]] typically has a rounded steel outer shell permanently welded shut, which seals operating gases inside the system. There is no route for gases to leak, such as around motor shaft seals. On this model, the plastic top section is part of an auto-defrost system that uses motor heat to evaporate the water.]]
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| Compressors used in refrigeration systems are often described as being either hermetic, open or semi-hermetic, to describe how the compressor and [[motor]] drive are situated in relation to the gas or vapor being compressed. The industry name for a hermetic is '''hermetically sealed compressor''', while a semi-hermetic is commonly called a '''semi-hermetic compressor'''.
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| In hermetic and most semi-hermetic compressors, the compressor and motor driving the compressor are integrated, and operate within the pressurized gas envelope of the system. The motor is designed to operate in, and be cooled by, the refrigerant gas being compressed.
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| The difference between the hermetic and semi-hermetic, is that the hermetic uses a one-piece welded steel casing that cannot be opened for repair; if the hermetic fails it is simply replaced with an entire new unit. A semi-hermetic uses a large cast metal shell with gasketed covers that can be opened to replace motor and pump components.
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| The primary advantage of a hermetic and semi-hermetic is that there is no route for the gas to leak out of the system. Open compressors rely on either natural leather or synthetic rubber seals to retain the internal pressure, and these seals require a lubricant such as oil to retain their sealing properties.
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| An open pressurized system such as an automobile air conditioner can leak its operating gases, if it is not operated frequently enough. Open systems rely on lubricant in the system to splash on pump components and seals. If it is not operated frequently enough, the lubricant on the seals slowly evaporates, and then the seals begin to leak until the system is no longer functional and must be recharged. By comparison, a hermetic system can sit unused for years, and can usually be started up again at any time without requiring maintenance or experiencing any loss of system pressure.
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| The disadvantage of hermetic compressors is that the motor drive cannot be repaired or maintained, and the entire compressor must be removed if a motor fails. A further disadvantage is that burnt out windings can contaminate whole systems requiring the system to be entirely pumped down and the gas replaced. Typically hermetic compressors are used in low-cost factory-assembled consumer goods where the cost of repair is high compared to the value of the device, and it would be more economical to just purchase a new device.
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| An advantage of open compressors is that they can be driven by non-electric power sources, such as an [[internal combustion engine]] or [[turbine]]. However, open compressors that drive refrigeration systems are generally not totally ''maintenance free'' throughout the life of the system, since some gas leakage will occur over time.
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| ==Temperature==
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| {{main|Gas laws}}
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| Compression of a gas increases its [[temperature]], often referred to as the ''heat of compression''.
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| : <math>W = \int_{V_1}^{V_2} p dV = p_1 V_1^n \int_{V_1}^{V_2} V^{-n} dV</math>
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| where
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| : <math>\frac { p_2 }{ p_1 }\ = \left( \frac{ V_1 } { V_2 }\ \right) ^ n</math>
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| so
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| : <math>W = \frac {{p_1} {V_1^n}} {1-n}\ ( {V_2^{1-n}} - {V_1^{1-n}} ) </math>
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| in which ''p'' is pressure, ''V'' is volume, ''n'' takes different values for different compression processes (see below), and 1 & 2 refer to initial and final states.
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| * [[Adiabatic process|Adiabatic]] - This model assumes that no energy (heat) is transferred to or from the gas during the compression, and all supplied work is added to the internal energy of the gas, resulting in increases of temperature and pressure. Theoretical temperature rise is:<ref>''Perry's Chemical Engineer's Handbook'' 8th edition
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| Perry, Green, page 10-45 section 10-76</ref>
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| : <math> T_2 = T_1 \left(\frac {p_2}{p_1}\right)^{(k-1)/k} </math>
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| with ''T''<sub>1</sub> and ''T''<sub>2</sub> in degrees [[Rankine scale|Rankine]] or [[kelvin]]s, ''p''<sub>2</sub> and ''p''<sub>1</sub> being absolute pressures and ''k'' = [[Heat capacity ratio|ratio of specific heat]]s (approximately 1.4 for air). The rise in air and temperature ratio means compression does not follow a simple pressure to volume ratio. This is less efficient, but quick. Adiabatic compression or expansion more closely model real life when a compressor has good insulation, a large gas volume, or a short time scale (i.e., a high power level). In practice there will always be a certain amount of heat flow out of the compressed gas. Thus, making a perfect adiabatic compressor would require perfect heat insulation of all parts of the machine. For example, even a bicycle tire pump's metal tube becomes hot as you compress the air to fill a tire.
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| The relation between temperature and compression ratio described above means that the value of n for an adiabatic process is k (the ratio of specific heats).
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| * [[Isothermal process|Isothermal]] - This model assumes that the compressed gas remains at a constant temperature throughout the compression or expansion process. In this cycle, internal energy is removed from the system as heat at the same rate that it is added by the mechanical work of compression. Isothermal compression or expansion more closely models real life when the compressor has a large heat exchanging surface, a small gas volume, or a long time scale (i.e., a small power level). Compressors that utilize inter-stage cooling between compression stages come closest to achieving perfect isothermal compression. However, with practical devices perfect isothermal compression is not attainable. For example, unless you have an infinite number of compression stages with corresponding intercoolers, you will never achieve perfect isothermal compression.
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| For an isothermal process, n is 1, so the value of the work integral for an isothermal process is:
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| : <math>W = - {p_1} {V_1} \ln \left( \frac {p_2} {p_1}\ \right)</math> | |
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| When evaluated, the isothermal work is found to be lower than the adiabatic work.
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| * [[Polytropic process|Polytropic]] - This model takes into account both a rise in temperature in the gas as well as some loss of energy (heat) to the compressor's components. This assumes that heat may enter or leave the system, and that input shaft work can appear as both increased pressure (usually useful work) and increased temperature above adiabatic (usually losses due to cycle efficiency). Compression efficiency is then the ratio of temperature rise at theoretical 100 percent (adiabatic) vs. actual (polytropic). Polytropic compression will use a value of n between 0 (a constant-pressure process) and infinity (a constant volume process). For the typical case where an effort is made to cool the gas compressed by an approximately adiabatic process, the value of n will be between 1 and k.
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| ==Staged compression==
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| In the case of centrifugal compressors, commercial designs currently do not exceed a compression ratio of more than a 3.5 to 1 in any one stage (for a typical gas). Since compression generates heat, the compressed gas is to be cooled between stages making the compression less adiabatic and more isothermal. The inter-stage coolers typically result in some partial condensation that is removed in [[vapor-liquid separator]]s.
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| In the case of small reciprocating compressors, the compressor flywheel may drive a cooling fan that directs ambient air across the [[intercooler]] of a two or more stage compressor.
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| Because rotary screw compressors can make use of cooling lubricant to remove the heat of compression, they very often exceed a 9 to 1 compression ratio. For instance, in a typical diving compressor the air is compressed in three stages. If each stage has a compression ratio of 7 to 1, the compressor can output 343 times atmospheric pressure (7 × 7 × 7 = 343 [[atmosphere (unit)|atmosphere]]s). ({{convert|343|atm|MPa ksi|sigfig=3|abbr=on|lk=out|disp=or}})
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| ==Prime movers==
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| There are many options for the "[[Wiktionary:prime mover|prime mover]]" or motor that powers the compressor:
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| * Gas [[turbine]]s power the axial and centrifugal flow compressors that are part of [[jet engine]]s.
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| * [[Steam turbine]]s or [[water turbine]]s are possible for large compressors.
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| * [[Electric motor]]s are cheap and quiet for static compressors. Small motors suitable for domestic electrical supplies use [[Single-phase electric power|single-phase]] [[alternating current]]. Larger motors can only be used where an industrial electrical [[Three-phase electric power|three phase]] alternating current supply is available.
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| * [[Diesel engine]]s or [[petrol engine]]s are suitable for portable compressors and support compressors. Common in automobiles and other types of vehicles (including piston-powered airplanes, boats, trucks, etc.), diesel or gasoline engines can power compressors using their own crankshaft power (this setup known as a [[supercharger]]), or, using their waste exhaust gas to spin a turbine connected to the compressor (this setup known as a [[turbocharger]]).
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| ==Applications==
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| Gas compressors are used in various applications where either higher pressures or lower volumes of gas are needed:
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| * In [[pipeline transport]] of purified natural gas from the production site to the consumer, a compressor is driven by a gas turbine fueled by gas bled from the pipeline. Thus, no external power source is necessary.
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| * Petroleum refineries, natural gas processing plants, petrochemical and chemical plants, and similar large industrial plants require compressing for intermediate and end-product gases.
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| * [[Refrigeration]] and [[air conditioner]] equipment use compressors to move [[heat]] in [[refrigerant]] cycles (see ''[[vapor-compression refrigeration]]'').
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| * Gas turbine systems compress the intake [[combustion]] air.
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| * Small-volume purified or manufactured gases require compression to fill high pressure cylinders for [[medical]], [[welding]], and other uses.
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| * Various industrial, manufacturing, and building processes require [[compressed air]] to power [[pneumatic tools]].
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| * In the manufacturing and blow moulding of PET plastic bottles and containers.
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| * Some aircraft require compressors to maintain [[cabin pressurization]] at altitude.
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| * Some types of [[jet engine]]s—such as [[turbojet]]s and [[turbofan]]s)—compress the air required for fuel combustion. The jet engine's [[turbine]]s power the combustion air compressor.
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| * In [[SCUBA diving]], [[hyperbaric oxygen therapy]], and other life support devices, compressors put [[breathing gas]] into small volume containers, such as [[diving cylinder]]s.<ref name=evil >{{cite journal
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| |title=Compressed breathing air – the potential for evil from within.
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| |author=Millar IL; Mouldey PG |year=2008 |volume=38 |pages=145–51 |journal=Diving and Hyperbaric Medicine. |publisher=[[South Pacific Underwater Medicine Society]]
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| |url=http://archive.rubicon-foundation.org/7964 |accessdate=2009-02-28
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| }}</ref><ref name=oxyhackers >{{cite book |author=Harlow, V
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| |title=Oxygen Hacker's Companion |publisher=Airspeed Press |year=2002 |isbn=0-9678873-2-1
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| }}</ref>
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| * In [[surface supplied diving]], an air compressor frequently supplies low pressure air (10 to 20 bar) for breathing.
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| * [[Submarine]]s use compressors to store air for later use in displacing water from buoyancy chambers to adjust depth.
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| * [[Turbocharger]]s and [[supercharger]]s are compressors that increase [[internal combustion engine]] performance by increasing the mass flow of air inside the cylinder, so the engine can burn more fuel and hence produce more power.
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| * [[Rail transport|Rail]] and heavy [[road transport]] vehicles use [[compressed air]] to operate [[Air brake (rail)|rail vehicle]] or [[Air brake (road vehicle)|road vehicle]] brakes—and various other systems ([[door]]s, [[windscreen wiper]]s, [[engine]], [[gearbox]] control, etc.).
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| * Service stations and auto repair shops use compressed air to fill pneumatic [[tire]]s and power pneumatic tools.
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| * [[Fire piston]]s and [[heat pump]]s exist to heat air or other gasses, and compressing the gas is only a means to that end.
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| In the United States, there were 300 gas compressor manufacturers in 2011 producing compressors for all of these uses. Although these factories were classified as small business, the total 2011 sales for gas and air compressors was over $9 billion.<ref>{{cite web|title=Gas Compressor Manufacturing|publisher=Pell Research|url=http://www.pellresearch.com/Air-and-Gas-Compressor-Manufacturing.htm}}</ref>
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| ==See also==
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| {{multicol|65%}}
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| * [[Cabin pressurization]]
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| * [[Centrifugal fan]]
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| * [[Compressed air]]
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| * [[Electrochemical hydrogen compressor]]
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| * [[Fire piston]]
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| * [[Foil bearing]]
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| * [[Gas compression heat pump]]
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| * [[Guided rotor compressor]]
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| * [[Hydrogen compressor]]
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| * [[Linear compressor]]
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| {{multicol-break}}
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| * [[Liquid ring|Liquid ring compressor]]
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| * [[Hydride compressor]]
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| * [[Natterer compressor]]
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| * [[Pneumatic cylinder]]
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| * [[Pneumatic tube]]
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| * [[Reciprocating compressor]] (piston compressor)
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| * [[Roots blower]] (a lobe-type compressor)
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| * [[Slip factor]]
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| * [[Trompe]]
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| * [[Vapor-compression refrigeration]]
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| * [[Variable speed air compressor]]
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| {{multicol-end}}
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| ==References==
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| {{Reflist}}
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| {{DEFAULTSORT:Gas Compressor}}
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| [[Category:Heating, ventilating, and air conditioning]]
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| [[Category:Compressors| ]]
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| [[Category:Diving support equipment]]
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| [[Category:Underwater work]]
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| [[Category:Gas technologies]]
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