Its Stainless steel construction allows for compatibility with ethanol, the highly corrosive working fluid of the ORC. Patented semi-hermetic design features provide adequate sealing of the flammable fluid, without the need for dynamic seals.
Testing of initial prototypes showed that overall efficiency of the expander is approaching 80% with lubricated operation.
Update August 8th, 2015 – A second-generation expander, the E25H074A-SH, is currently in limited production. The unit features aluminum construction and involute changes.
Update May 8th, 2017 – A third-generation expander, the E25H061A-SH-CI, has been released for pre-production. The unit features cast iron construction and involute changes.