The E28H080A-SH is designed to expand 170 ºC steam at 9 barg, down to 1.5 barg. At the maximum running speed of 3,600 RPM, the scroll expander is capable of 11-13 kW output power. The expander displaces approximately 196 cm3 per revolution, and has a volume ratio of 4.5.
Steam, as a working fluid, presents a unique challenge for oil-free scroll devices, as bearings are susceptible to corrosion. To accommodate this, the expander uses a patented bellows configuration which separates the working fluid from non-corrosion-resistant components. Although intended for use with steam, the semi-hermetic design can handle virtually any gas that is compatible with aluminum and stainless steel.
Air Squared is currently developing a second generation prototype for use with various refrigerants. The unit will be complete by Q4 of 2015.