Multiple intercooling and reheat
With multiple inter-cooling and multiple reheat, the compression and expansion processes tend to be isothermal.
Figure: Multiple reheat and intercool cycle
The cycle tends towards the Ericsson cycle, the efficiency is same as that of the Carnot cycle
The use of intercoolers is seldom contemplated in practice because they are bulky and need large quantities of cooling water. The main advantage of the gas turbine, that it is compact and self-contained, is then lost.