Process for mechanical power generation

A process of mechanical power generation using a binary cycle having a primary cycle and a secondary cycle, wherein the primary cycle employs a mixture of water and a second substance which is substantially immiscible with water and has substantially lower volatility than water, comprising in the primary cycle:

• (a) dry expanding of a dry vapor mixture from a maximum working pressure and temperature to a minimum working pressure, to produce an expanded vapor mixture;
• (b) cooling the expanded vapor mixture and then condensing at variable temperatures part of the substance of the higher boiling point, the heat yielded by said condensation being recovered by the primary cycle in step (e);
• (c) separating the part of the substance of higher boiling point which has condensed in step (b), and pumping said condensed part to a point of equivalent temperature in step (e);
• (d) total condensing the vapor mixture remaining after step (c) in a heat exchanger which transfers heat from the primary to the secondary cycle, first at variable temperatures until it reaches the eutectic composition and then at the eutectic temperature corresponding to the minimum working pressure of the primary cycle;
• (e) recovering the heat ceded in step (b) for heating the mixture condensed in step (d) and for partially vaporizing it;
• (f) absorbing heat by the mixture in two phases obtained from step (e), the mixture vaporizing totally until reaching the maximum working temperature of the primary cycle, to return to step (a).