recuperator

[ri-koo-puh-rey-ter, -kyoo-]
noun
1.
a person or thing that recuperates.
2.
(in a recuperative furnace) a system of thin-walled ducts through which incoming air and exhausted gases pass separately so that the air is heated by the gases.

Origin:
1700–10; < Latin recuperātor regainer, equivalent to recuperā(re) to recover (see recuperate) + -tor -tor

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World English Dictionary
recuperator (rɪˈkuːpəˌreɪtə, -ˈkjuː-)
 
n
1.  a person that recuperates
2.  a device employing springs or pneumatic power to return a gun to the firing position after the recoil
3.  chemical engineering a system of flues that transfers heat from the hot gases leaving a furnace to the incoming air

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The terms recuperator and regenerator refer to the type of heat exchanger used to increase system efficiency.
Use of a recuperator also offers an opportunity to maintain better seal between the heating wall and the ladle.
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