Regeneration is a process in which high temperature turbine exhaust is used to increase the temperature of compressed air before entering in the combustion chamber. It is achieved by placing a regenerator i.e. a heat exchanger after compressor and before the combustion chamber as shown below.
Brayton Cycle with Regeneration
In Reheating, turbine exhaust is reheated in another combustion chamber and then further expanded in another turbine. By use of reheating in the gas turbine, net work output of the cycle increase at the cost of efficiency, but at the same time scope of regeneration increases. therefore reheating is generally coupled with regeneration.
Brayton cycle with reheating
Regeneration and reheating in gas turbine
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