Organic Rankine Cycle
An Organic Rankine Cycle (ORC) uses an organic working fluid that has a boiling point less than that of water to convert low-temperature heat into mechanical work. The mechanical work that is generated can then be converted into electricity.
A heat engine is a simple engine that converts thermal heat into mechanical work. A heat engine operates by extracting heat from a hot reservoir and moving it over to a cold reservoir, generating work in the process. A drawing of a basic heat engine is shown below: