Patent ID: 7594399

Claim:
A system for power generation using a Rankine Cycle, comprising: a boiler connected to an inlet and an outlet, said boiler configured to receive heat from an external source and configured to receive a liquid stream through said inlet and to generate a vapor stream through said outlet, wherein said liquid stream comprises a mixture of a higher boiling point liquid and a lower boiling point liquid; an expander configured to receive said vapor stream and to generate power and an expanded stream; a condenser configured to receive said expanded stream and to generate said liquid stream; and a supply system coupled to said boiler or said condenser and configured to control relative concentration of said higher boiling point liquid and said lower boiling point liquid, wherein said supply system increases an amount of said higher boiling point liquid and decreases an amount of said lower boiling point liquid in said liquid stream being supplied to said inlet of said boiler when a temperature of said external source is below a nominal temperature, and wherein said supply system decreases an amount of said higher boiling point liquid and increases an amount of said lower boiling point liquid in said liquid stream being supplied to said inlet of said boiler when a temperature of said external source is above said nominal temperature.