heat exchanger

a device for transferring the heat of one substance to another, as from the exhaust gases to the incoming air in a regenerative furnace.


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World English Dictionary
heat exchanger
a device for transferring heat from one fluid to another without allowing them to mix

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
heat exchanger  

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A device used to transfer heat from one fluid to another without direct contact of the fluids. Heat exchangers usually maximize the transfer of heat by maximizing the contact surface area between fluids, as when the warmer fluid is passed through a series of coils or thin plates. A car radiator is a heat exchanger, transferring the heat in a liquid that has circulated through the engine to the air.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
In the reactor, the heat of the fuel then heats the air and water, causing them
  to rise up through a pipe to a heat exchanger.
Lovecraft installs a heat exchanger to thin the grease so it combusts easily.
Simply use the sunlight to heat up the salts and put those molten salts in
  proximity to water via a heat exchanger.
To protect the turbines, you need a heat exchanger to heat the clean working
  fluid near or at the surface.
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