DuoTurbo: Implementation of a Counter-Rotating Hydroturbine for Energy Recovery in Drinking Water Networks

To enhance the sustainability of water supply systems, development new technologies for micro scale hydropower remains an active field research. The present paper deals with implementation a micro-hydroelectric system drinking facilities, targeting gross capacity between 5 kW and 25 kW. A counter-rotating microturbine forms core element energy recovery system. modular in-line technology is supposed to require low capital expenditure, profitability within 10 years. One stage DuoTurbo composed two axial runners, each one featured wet permanent magnet rim generator independent speed regulation. This compact mechanical design facilitates integration into existing installations. first product prototype developed by means Computational Fluid Dynamics based hydraulic along laboratory tests assess efficiency characteristics. agreements simulated measured characteristics absolute errors widely below 5% validate approach large extent. provides maximum electrical power 6.5 at head 75 m, reaching hydroelectric peak 59%. In 2019, pilot was commissioned facility its long-term behavior thus, advanced readiness levels. best authors knowledge, it runner regulation generators in real-world facility. complete year operation monitored without showing significant drifts vibration. demonstration operational environment pre-commercial state validated that can be attributed level 7. overall results this study are promising regarding further industrialization steps potential broad-scale applicability industry.