Similar to a simple Rankine cycle, a basic organic Rankine cycle (ORC) consists of four processes: increasing pressure of the working fluid through a pump, high temperature heat addition through an evaporator, expansion of the high temperature as well as high pressure fluid through a turbine, and low temperature heat ...

The ORC has been used to exploit low-quality heat from a number of different sources. They have been used with low-temperature geothermal reservoirs and can be added as bottoming cycles for a range of different heat engine generating systems.

ORC WHR system consists of four major components: pump, evaporator, expander and condenser, as shown in Figure 1.

The ORC turbogenerator uses medium-to-high-temperature thermal oil to preheat and vaporize a suitable organic working fluid in the evaporator (4>5). The organic fluid vapor rotates the turbine (5>6), which is directly coupled to the electric generator, resulting in clean, reliable electric power.