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1. Definition
1.1 Normative definition
Definition taken from standard NF ISO 3977
"Thermodynamic system comprising two or more power cycles, each of which uses a different working fluid. Combined steam/air cycles (the most commonly used working fluids) have increased thermal efficiency because the two cycles are thermodynamically complementary: the heat rejected by the gas turbine (Brayton cycle) is at such a temperature that it can be the main energy source or a complementary energy source for the steam turbine (Rankine cycle).
As its name suggests, a combined-cycle plant combines two thermodynamic cycles: a combustion turbine (Brayton or Joule cycle), a recovery boiler and a steam turbine (Hirn cycle)....
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