A new combined SEOL cycle is represented by the recovery vapor Generator (GVR) which completely substitutes the Regenerator, of the prior art, being capable of recovering the energy differential (QR) between the temperature at the end of expansion and the temperature at nearly complete condensation of the thermal fluid and then, by using this great energy differential, it is capable of producing water vapor, entirely reusable in the preheating of the mixture, considerably contributing to the increase of the overall energy yield of the cycle and to the increase of the unit power of the heat engine.