The heart of the ORCA™ system is our patented, efficient, and economical TGE ™ expander
Organic Rankine Cycle (ORC)
ORC Expansion Devices
Most ORC systems run turbines or a compressor technology backwards as an expansion device. Typical technologies are screws (both single and twin), scrolls, and turbines. These technologies are flow devices and require very high flow rates, which in turn require large amounts of refrigerant (The TGE™ is a pressure device and requires far less refrigerant). At small sizes, other expander technologies have low isentropic efficiencies.
In the ideal cycle described by the expander’s theoretical model, the expansion is perfect and all possible expansion can occur. In any real cycle, only a part of the energy recoverable from the process is transformed into useful work. The other part is converted into heat and is lost, reducing the efficiency of the expander. The isentropic efficiency of the expander is defined by comparison with a perfect (isentropic) expansion. The higher the isentropic efficiency, the more efficient and cost effective the cycle.