Heat Exchanger Definition of Heat Exchanger

E-mail

20%Password

Remember Me Register Forgot password?

?

?

?

6,836,885,180 visitors served.

T E X T

TheFreeDictionary Google Bing ?

Word / Article Starts with Ends with Text

Dictionary/thesaurus

Medicaldictionary

Legaldictionary

Financialdictionary

Acronyms

Idioms Encyclopedia Wikipediaencyclopedia ?

Heat Exchanger Also found in: Dictionary/thesaurus, Medical, Financial, Acronyms, Wikipedia 0.01 sec.

Ads by Google:

On this pageWord Browser

Advertisement (Bad banner?Please let us know Remove Ads

heat exchanger [′hēt iks‚chānj·ər](engineering)

Any device, such as an automobile radiator, that transfers heat from onefluid to another or to the environment. Also known as exchanger.

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-HillCompanies, Inc.

Heat exchanger

A device used to transfer heat from a fluid flowing on one side of a barrier toanother fluid (or fluids) flowing on the other side of the barrier.

When used to accomplish simultaneous heat transfer and mass transfer, heatexchangers become special equipment types, often known by other names.When fired directly by a combustion process, they become furnaces, boilers,heaters, tube-still heaters, and engines. If there is a change in phase in one ofthe flowing fluids—condensation of steam to water, for example—theequipment may be called a chiller, evaporator, sublimator, distillation-columnreboiler, still, condenser, or cooler-condenser.

Heat exchangers may be so designed that chemical reactions or energy-generation processes can be carried out within them. The exchanger thenbecomes an integral part of the reaction system and may be known, forexample, as a nuclear reactor, catalytic reactor, or polymerizer.

Heat exchangers are normally used only for the transfer and useful eliminationor recovery of heat without an accompanying phase change. The fluids oneither side of the barrier are usually liquids, but they may also be gases suchas steam, air, or hydrocarbon vapors; or they may be liquid metals such assodium or mercury. Fused salts are also used as heat-exchanger fluids insome applications.

Most often the barrier between the fluids is a metal wall such as that of a tubeor pipe. However, it can be fabricated from flat metal plate or from graphite,plastic, or other corrosion-resistant materials of construction.

Heat exchangers find wide application in the chemical process industries,including petroleum refining and petrochemical processing; in the food industry,for example, for pasteurization of milk and canning of processed foods; in thegeneration of steam for production of power and electricity; in nuclear reactionsystems; in aircraft and space vehicles; and in the field of cryogenics for thelow-temperature separation of gases. Heat exchangers are the workhorses ofthe entire field of heating, ventilating, air-conditioning, and refrigeration. SeeConduction (heat), Convection (heat), Cooling tower, Evaporator, Heattransfer, Vapor condenser

McGraw-Hill Concise Encyclopedia of Engineering. © 2002 by The McGraw-Hill Companies, Inc.

heat exchangerA device designed to transfer heat between two physically separatedfluids; generally consists of a cylindrical shell with longitudinal tubes; onefluid flows on the inside, the other on the outside.

McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

Warning! The following article is from The Great Soviet Encyclopedia(1979). It might be outdated or ideologically biased.

Heat Exchanger

a device in which heat is transferred from one to another fluid (or fluids) orbetween a fluid and the surface of a solid. The process of heat transfer fromone fluid to another is one of the most important and most widely usedprocesses in technology. For example, the production of steam in boiler units isbased on the transfer of heat from the products of the combustion of organicfuel to water.

According to the operating principle used, heat exchangers are divided intothree types: recuperative, regenerative, and direct-contact. There also existheat exchangers in which a fluid is heated (or cooled) by an “internal” source ofheat (or cold).

In recuperative heat exchangers, two flowing fluids at different temperatures

Page tools

Printer friendlyCite / link

Feedback

This site:

Follow: Share:

Advertisement (Bad banner? Please let us know Remove Ads

My bookmarksPlease log in or register to use bookmarks. Youcan also log in with Facebook, Google, Twitter,or Yahoo.

Sync your bookmarks to all yourdevices and never lose them.

Track your learning with pointsand badges.

Earn meals for hungry childrenjust by reading and playinggames!

CharityFeed your brain, feed a hungry child

Usage samples from TheFreeLibrary.comA combination heat exchanger and static mixerfrom Fluitec Georg AG in Neftenbach,Switzerland, is being used to replace the secondcooling extruder in tandem extrusion of PS foam.

Heat exchanger replaces tandem foamextruder by Plastics Technology

SDK; TSE: 4004)) has announced the adoptionof its automotive heat exchangers in HondaMotor Co.

Showa Denko K.K. (SDK) Heat ExchangersAdopted in Honda's New Civic ... by JCN

Newswires

Plateflow heat exchangers are said to providemore heat transfer in less space.

Heat exchangers by Rubber World

More results

Share: Cite / link:

Log in with The Free Dictionary

Heat Exchanger definition of Heat Exchanger in the Free Online En... http://encyclopedia2.thefreedictionary.com/Heat+exchanger

1 of 3 8/29/2014 3:24 PM

This site has bee

? ? ? ?

are separated by a solid wall. Heat transfer occurs through convection in thefluids, through conduction in the wall (seeCONVECTIVE HEAT EXCHANGE), andthrough radiative transfer if at least one of the fluids is a radiating gas.Examples of recuperative heat exchangers include steam generators,preheaters, and evaporators. Some designs of recuperative exchangers areshown in Figure 1.

In regenerative heat exchangers, the same heating surface is alternatelyexposed to the hot and the cold fluid—that is, the surface first receives heatand is heated and then gives up heat and is cooled. A typical example of aregenerator is the hot-blast stove in a blast furnace.

Since the heat transfer in recuperative and regenerative heat exchangersoccurs at the surface of a solid, they are called surface heat exchangers. Indirect-contact, or contact, heat exchangers, the transfer of heat occurs withthe fluids in direct contact. Cooling towers, in which water is cooled byatmospheric air, are heat exchangers of this type.

Heat exchangers with an internal source of heat or cold involve the use of justone fluid. Nuclear reactors and electric heaters are heat exchangers of thistype.

The calculation of the thermal quantities characterizing a heat exchangerreduces to the simultaneous solution of the heat-balance and heat-transferequations. A distinction is made between design calculations, which arenecessary to determine the heat-transfer surface area and are carried out inthe design of new heat exchangers, and check calculations, which are carriedout to determine the quantity of heat transferred and the final temperatures ofthe fluids for a known heat-transfer surface area.

Heat exchangers are used extensively in thermal power engineering. Examplesare air preheaters, superheaters, economizers, and condensers. Other areaswhere heat exchangers are used include the chemical and food industries.

REFERENCESKichigin, M. A., and G. N. Kostenko. Teploobmennye apparaty i vyparnyeustanovki. Moscow-Leningrad, 1955.Kays, W. M., and A. L. London. Kompaktnye teploobmenniki, 2nd ed.Moscow, 1967. (Translated from English.)Kasatkin, A. G. Osnovnye protsessy i apparaty khimicheskoi tekhnologii, 9thed. Moscow, 1973.

I. N. ROZENGAUZ

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

Want to thank TFD for its existence? Tell a friend about us, add a link to thispage, or visit the webmaster's page for free fun content.

Link to this page:

Please bookmark with social media, your votes are noticed and appreciated:

Mentioned in

References in periodicals archive

Encyclopedia browser

Full browseraftercoolerAir Preheaterair systemair-cooled heat exchangerAntegmitartificial hypothermiaAtomic Power Plantattemperatorbare tubebolstercleaning lanecleaning turbineclosed-cycle reactorcondenser tubeConditionercoolantcoolercooling mediumcooling system

A combination heat exchanger and staticmixer from Fluitec Georg AG in Neftenbach,Switzerland, is being used to replace thesecond cooling extruder in tandem extrusion ofPS foam.

Heat exchanger replaces tandem foamextruder by Plastics Technology

SDK; TSE: 4004)) has announced the adoptionof its automotive heat exchangers in HondaMotor Co.Showa Denko K.K. (SDK) Heat Exchangers

Adopted in Honda's New Civic ... by JCNNewswires

Plateflow heat exchangers are said to providemore heat transfer in less space.

Heat exchangers by Rubber World

More results

heat checkheat coilheat conductionheat conductivityheat contentheat convectionheat crampsheat cycleheat deathHeat Death of the Universeheat detectorheat developmentheat dissipationheat distortion pointHeat Distribution Pointheat dumpHeat Eliminationheat energy

Heat Dissipation Unitheat distortion pointHeat Distortion TemperatureHeat Distribution Pointheat dumpheat edemaHeat Eliminationheat energyheat energyheat engineheat engineHeat EngineeringHeat Engineering InstituteHeat enginesHeat enginesHeat equationHeat equatorHeat equator


2 of 3 8/29/2014 3:24 PM

TheFreeDictionary Google?

Word / Article Starts with Ends with Text

Free Tools: For surfers: Free toolbar & extensions | Word of the Day | Bookmark | HelpFor webmasters: Free content | Linking | Lookup box | Double-click lookup

Mobile Site | Terms of Use | Privacy policy | Feedback | Advertise with Us | Copyright © 2014 Farlex, Inc. a Mode PartnerDisclaimer

All content on this website, including dictionary, thesaurus, literature, geography, and other reference data isfor informational purposes only. This information should not be considered complete, up to date, and is notintended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.


3 of 3 8/29/2014 3:24 PM

Documents

Heat Exchanger Definition of Heat Exchanger