
1) Gas technology 
Found on 
https://www.crosswordclues.com/clue/heat-exchanger

A device to rapidly cool wort. Usually copper tubing that has cold water running through it. Sometimes 2 tubes, one inside the other, with wort going through one and cold water going through the other.
Found on 
http://brewdudes.wordpress.com/beer-making-terminology/

A heat exchanger is a device built for efficient heat transfer from one medium to another, whether the media are separated by a solid wall so that they never mix, or the media are in direct contact.
Found on 
http://en.wikipedia.org/wiki/Glossary_of_fuel_cell_terms

 A heat exchanger is a piece of equipment built for efficient heat transfer from one medium to another. The media may be separated by a solid wall to prevent mixing or they may be in direct contact. They are widely used in space heating, refrigeration, air conditioning, power plants, chemical plants, petrochemical plants, petroleum refineries, natu...
Found on 
http://en.wikipedia.org/wiki/Heat_exchanger

A mechanical device used to rapidly reduce the temperature of the wort.
Found on 
http://www.beeradvocate.com/beer/101/terms/

any of several devices that transfer heat from a hot to a cold fluid. In many engineering applications it is desirable to increase the temperature ... [2 related articles]
Found on 
http://www.britannica.com/eb/a-z/h/28

Shell and tube heat exchanger A device used to transfer heat from a fluid (liquid or gas) to another fluid where the two fluids are physically separated. Heat exchangers for solar water heating systems Solar water heating systems use heat exchangers to transfer solar energy absorbed in s...
Found on 
http://www.daviddarling.info/encyclopedia/H/AE_heat_exchanger.html

 A heat exchanger is a device that transfers heat between two separated fluids. The fluids in a heat exchanger will never merge as a hard wall separates them. A heat exchanger is mainly used in air conditioning, refrigeration and chemical processing.
Found on 
http://www.designbuild-network.com/glossary/heat-exchanger.html

a component intended to transfer heat from one coolant to another while keeping the two coolants separate
Found on 
http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=411-44-10

Piece of equipment used in desalination to take heat away from steam and turn it into water.
Found on 
http://www.encyclo.co.uk/local/20442

a device through which heat is transferred from one liquid to another. It usually consists of a coiled arrangement of metal tubing.
Found on 
http://www.encyclo.co.uk/local/20842

a device which transfers heat through a conducting wall from one fluid to another.
Found on 
http://www.encyclo.co.uk/local/21121

[
n] - device that transfers heat from one liquid to another without allowing them to mix
Found on 
http://www.webdictionary.co.uk/definition.php?query=heat%20exchanger

equipment used to heat or cool the wort rapidly.
Found on 
https://byo.com/resources/glossary

Removes heat from oil with water, which comes from #5 cell.
Found on 
https://steelforge.com/literature/steelog-the-5000-word-metals-glossary/

A device that transfers heat from one liquid to another without allowing them to mix.
Found on 
https://www.encyclo.co.uk/local/20625
 noun device that transfers heat from one liquid to another without allowing them to mix
Found on 
https://www.encyclo.co.uk/local/20974

A device to rapidly cool wort. Usually copper tubing that has cold water running through it. Sometimes 2 tubes, one inside the other, with wort going through one and cold water going through the other.
Found on 
https://www.encyclo.co.uk/local/21582

A mechanical device used to rapidly reduce the temperature of the wort.
Found on 
https://www.encyclo.co.uk/local/22617

A device in which heat is transferred from one substance to another, for the purpose of cooling (or heating) one (or both) of the substances.  Wort chillers (both immersion and counterflow) are examples of heat exchangers, as are HERMS mashing systems.
Found on 
https://www.encyclo.co.uk/local/22622

A device used to transfer heat from a fluid (liquid or gas) to another fluid where the two fluids are physically separated.
Found on 
https://www.encyclo.co.uk/local/22819

A device for transferring thermal energy from one fluid to another.
Found on 
https://www.encyclo.co.uk/local/22831

A heat exchanger is a device that transfers heat from one source to another. For example, there is a heat exchanger in your furnace
Found on 
https://www.encyclo.co.uk/local/23310

Apparatus that takes the heat from one liquid and transfers it to another without mixing the two.
Found on 
https://www.whisky.com/information/knowledge/about-whisky/whisky-glossary.h
  No exact match found.