Organic Rankine cycles
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Organic Rankine cycles employ organic substances as working fluids, including pentane, mixtures of hydrocarbons, commonly used refrigerants, ammonia, and silicon oil. The organic working fluid is typically selected to meet the requirements of the particular application. For instance, the relatively low boiling point of these substances allows the Rankine cycle to produce power from low-temperature sources, including industrial waste heat, geothermal hot water, and fluids heated by concentrating-solar collectors.