A regenerative heat exchanger or a regenerator is a heat exchanger where heat from hot fluid is first passed to a storage medium and then it is passed to the cold fluid which absorbs the heat. In regenerative heat exchanger, the fluid on either side of heat exchanger can be the same fluid.
Regenerative heat exchanger was one of the most important technologies developed during industrial revolution. It is used for hot blast in blast furnace.
Also used in steel industries, glass industries, in high pressure boilers and in many chemical industries.
The first regenerator was developed by Dr. Robert Stirling in 1816 and was used as a component of his stirling engine.
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