Patent ID: 8490397

Claim:
A waste heat recovery system, comprising: a Brayton cycle system comprising: a heater configured to circulate carbon dioxide vapor in heat exchange relationship with a hot fluid to heat the carbon dioxide vapor; a first turbine coupled to the heater and configured to expand the carbon dioxide vapor; a cooler; and a compressor configured to compress the carbon dioxide vapor fed through the cooler; and a Rankine cycle system coupled to the Brayton cycle system; wherein the Rankine system comprises: a first heat exchanger, a second heat exchanger, and a third heat exchanger, wherein the carbon dioxide vapor from the first turbine is circulated in heat exchange relationship with a vaporized working fluid sequentially via the first heat exchanger, the second heat exchanger, and the third heat exchanger to heat the working fluid; wherein the cooler is configured to cool the carbon dioxide vapor fed through the first heat exchanger, the second heat exchanger, and the third heat exchanger; a fourth heat exchanger configured to circulate the vaporized working fluid in heat exchange relationship with the carbon dioxide vapor fed from the compressor so as to heat the working fluid a second turbine configured to expand the vaporized working fluid fed from the fourth heat exchanger via the first heat exchanger; and a condenser configured to condense the vaporized working fluid fed from the second turbine via the third heat exchanger.