The fish-safe RHT is available in radial and axial inflow configurations with runner diameters measuring from 0.5 m (1.6 ft) to greater than 2.5 m (8.2 ft), and generating capacities from 30 kW to over 3 MW. Direct-drive generation, shortened draft tubes, and submersible housings simplify plant design and minimize installation costs.
The RHT can be adapted to site conditions in a variety of different configurations, including a bulb, pit, S-turbine, open flume S-turbine, and Z-turbine, which can be either pipe-fed or open flume. Scrollcase turbine and radial inflow open flume configurations are also possible. RHTs can be integrated into matrix designs for larger scale deployments of up to 30 MW.
The RHT is offered as a runner retrofit for low-head Francis and Kaplan turbines, allowing existing hydropower installations to significantly improve efficiency, energy output and fish safety without major changes to power plant infrastructure.
Natel rigorously tests the RHT’s performance at our in-house closed-loop hydraulic test facility. We use world-class instrumentation to measure flow, pressure, torque, and speed in scale-model turbine tests of net heads up to 10 meters and flow rates up to 1 cms.
Performance tests are conducted to the American Society of Mechanical Engineers PTC-18 standard. The results of our testing work to-date, including third-party tests conducted on a D55 RHT (0.55-diameter runner) have clearly demonstrated >90.5% peak hydraulic efficiency.