EP 1 930 587 A2 EUROPEAN PATENT APPLICATION

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EP 1 930 587 A2 EUROPEAN PATENT APPLICATION ( ep-1-930-587-a2-european-patent-application )

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7 EP 1 930 587 A2 8 6. The turbine system of any preceding claim, and fur- ther comprising a heat exchanger (26), wherein the thermal energy is transferred from the molten salt heat transfer fluid to a carbon dioxide Brayton cycle working fluid. 7. A system for providing energy for a supercritical car- bon dioxide turbine (36), the system comprising: a Brayton cycle working fluid for providing ener- gy to the supercritical carbon dioxide turbine (36); and a solar receiver (20) for heating a heat transfer fluid to a temperature of at least about 1065 de- grees Fahrenheit (574°C), wherein the heat transfer fluid is in communication with the Bray- ton cycle working fluid. 8. The system of claim 7, wherein the supercritical car- bon dioxide turbine (36) operates at an inlet temper- ature of about 1022 degrees Fahrenheit (550°C). 9. The system of claim 7 or 8, wherein the heat transfer fluid comprises molten salt. 10. The system of claim 9, wherein the molten salt heat transfer fluid comprises between about 50% sodium nitrate and about 70% sodium nitrate and between about 30% potassium nitrate and about 50% potas- sium nitrate by weight. 11. Thesystemofclaim9or10,whereintheheattransfer fluid provides thermal energy to the supercritical car- bon dioxide turbine (36). 12. The system of claim 11, and further comprising a heat exchanger (26), wherein the thermal energy is transferred from the molten salt to carbon dioxide. 13. The system of any of claims 7 to 12, wherein the system is a solar heating system (12). 14. A method of providing energy to a supercritical car- bon dioxide turbine (36), the method comprising: capturing solar energy from sunlight; heating a heat transfer fluid to a temperature of at least about 1065 degrees Fahrenheit (574°C) with the solar energy; and transporting energy from the heat transfer fluid to heat a Brayton cycle working fluid of the su- percritical carbon dioxide turbine (36). 15. Themethodofclaim14,whereincapturingsolaren- ergy comprises using a solar heating system (12). 16. Themethodofclaim14or15,whereintheheattrans- fer fluid comprises molten salt. 17. The method of claim 16, wherein the molten salt heat transfer fluid comprises between about 50% sodium nitrate and about 70% sodium nitrate and between about 30% potassium nitrate and about 50% potas- sium nitrate by weight. 18. The method of any of claims 14 to 17, wherein trans- porting the energy of the heat transfer fluid to heat the Brayton cycle working fluid of the supercritical carbon dioxide turbine comprises using a heat ex- changer. 19. The method of any of claims 14 to 18, wherein the heat transfer fluid provides thermal energy to the su- percritical carbon dioxide turbine (36). 20. The method of any of claims 14 to 19, wherein the supercritical carbon dioxide turbine comprises a su- percritical carbon dioxide Brayton power conversion cycle. 5 10 15 20 25 30 35 40 45 50 55 5

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