Systems and methods for power generation from multiple heat sources using customized working fluids

In a power generating system comprising a first heat source having a first temperature and a second heat source having a second temperature that is greater than the first temperature, the power generating system employing a Rankine cycle system comprising:

• a heat exchange system coupled to each of the first heat source and the second heat source;
• and
• a customized working fluid flowing in the heat exchange system, the customized working fluid comprising a first constituent fluid and a second constituent fluid,
• wherein the first constituent fluid undergoes a phase change before the second constituent fluid.

A system comprising:

• a plurality of heat sources;
• a power generator coupled to each of the plurality of heat sources;
• and
• a plurality of customized working fluids flowing in the power generator,
• wherein each of the customized working fluids comprises a mixture of a plurality of constituent fluids, and
• wherein the mixture exhibits a working fluid profile with at least one constituent phase point at which one of the plurality of constituent fluids undergoes a phase change before any of the other of the plurality of constituent fluids.