Thermodynamic Principle behind the Organic Rankine Cycle

ORC technology is similar to a traditional steam turbine, but with a single, important difference. Instead of using water vapor, the ORC system vaporizes a high-molecular-mass organic fluid, resulting in excellent electric performance and several key advantages: slower turbine rotation, lower pressure, and no erosion of metallic parts and blades. The ORC unit is preassembled onto one or more skids and can be easily transported.

The ORC turbogenerator uses medium-to-high-temperature thermal oil to preheat and vaporize a suitable organic working fluid in the evaporator. The organic fluid vapor rotates the turbine, which isdirectly coupled to the electric generator, resulting in clean, reliable electric power.

The exhaust vapor flows through the regenerator, where it heats the organic liquid and is then condensed in the condenser and cooled by the cooling circuit. The organic working fluid is then pumped into the regenerator and evaporator, thus completing the closed-cycle operation.