**6. Gas turbines in unconventional applications**

Unconventional gas turbine applications are discussed in this chapter. Some of engineering solutions are intended for smaller gas turbine systems, where the regenerative heat exchanger supplies energy for an additional thermal cycle. Coupling of Brayton cycle with several other thermodynamic cycles (e.g. another Brayton, Diesel or Stirling cycles) is discussed, and advantages of hybrid systems are analyzed. Large international development programmes are reviewed, and several hydrogen-fuelled gas turbine concepts are proposed. Potential combination of a hydrogen-fuelled gas turbine and a nuclear power generation unit which is used to cover peak load power demands in a power system is described.
