Dual reheat rankine cycle system and method thereof

1. A rankine cycle system, comprising:

a heater configured to circulate a working fluid in heat exchange relationship with a hot fluid to vaporize the working fluid;

a hot system coupled to the heater; wherein the hot system comprises a first heat exchanger configured to circulate a first vaporized stream of the working fluid from the heater in heat exchange relationship with a first condensed stream of the working fluid, thereby heating the first condensed stream to produce therefrom a second vaporized stream of the working fluid; and

a cold system coupled to the heater and the hot system; wherein the cold system comprises a second heat exchanger configured to circulate the second vaporized stream of the working fluid from the hot system in heat exchange relationship with a second condensed stream of the working fluid to heat the second condensed stream of the working fluid before being fed to the heater.

2. The system of claim 1 , wherein the hot system comprises a first expander configured to expand the first vaporized stream of the working fluid from the heater.

3. The system of claim 2 , wherein the hot system comprises a first condensing unit configured to condense the expanded first vaporized stream of the working fluid fed from the heater via the first heat exchanger.

4. The system of claim 3 , wherein the hot system comprises a pump configured to feed a condensed stream of the working fluid via the first heat exchanger to generate the second vaporized stream of the working fluid.

5. The system of claim 4 , wherein the cold system comprises a second expander configured to expand the second vaporized stream of the working fluid from the first heat exchanger.

6. The system of claim 1 comprising a plurality of condensing units.

7. The system of claim 1 comprising a single pump.

8. The system of claim 1 comprising a plurality of pumps.

9. The system of claim 1 comprising two and only two expanders.

10. The system of claim 1 comprising a plurality of expanders.

11. The system of claim 1 , wherein the cold system comprises a pump configured to feed the second condensed stream of the working fluid via the second heat exchanger to the heater.

12. The system of claim 1 , wherein the working fluid comprises carbon dioxide.

13. The system of claim 1 , wherein the hot fluid comprises an exhaust gas.

14. A method, comprising:

circulating a working fluid in heat exchange relationship with a hot fluid via a heater to vaporize the working fluid;

circulating a first vaporized stream of the working fluid from the heater in heat exchange relationship with a first condensed stream of the working fluid via a first heat exchanger of a hot system, thereby heating the first condensed stream of the working fluid to produce a second vaporized stream of the working fluid therefrom; and

circulating the second vaporized stream of the working fluid from the hot system in heat exchange relationship with a second condensed stream of the working fluid via a second heat exchanger of a cold system to heat the second condensed stream of the working fluid before being fed to the heater.

15. The method of claim 14 , wherein the first and second condensed streams of the working fluid are produced from separate condensing units.

16. The method of claim 14 , wherein the working fluid is carbon dioxide.

17. The method of claim 14 , further comprising expanding the first vaporized stream of the working fluid from the heater via a first expander of the hot system.

18. The method of claim 17 , further comprising condensing the expanded first vaporized stream of the working fluid via a first condensing unit of the hot system.

19. The method of claim 18 , further comprising expanding the second vaporized stream of the working fluid from the first heat exchanger via a second expander of the cold system.

20. The method of claim 19 , further comprising condensing the expanded second vaporized stream of the working fluid via a second condensing unit of the cold system.