Exergy - Radial Outflow Turbine
The radial outflow turbine designed and produced by Exergy is unique in the ORC market. From an inspiration in the 2010 we reinvented this technology and for the first time we took it to compete in the ORC field with the well-known axial and radial inflow configurations. This type of turbine has been used since late nineteenth century in traditional steam Rankine, known as Ljungstrom, Parsons or Siemens turbine, but suffered the competition of axial turbines due to technological issues that have been easily overcome in the ORC application; The radial outflow turbine is capable of processing low enthalpy drop on a single stage, thus when it is applied to a steam Rankine cycle tens of stages and multiple disks are needed. On the other hand this technology is optimal for the organic Rankine cycle, as through a limited number of stages on the same disk the turbine can process the entire available enthalpy drop.
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Advantages:
Working with an organic fluid most of the characteristics of the radial outflow turbine become advantageous as summarized below:
- Excellent match of the volumetric flow and the cross section across the radius ;
- No need for partial admission ;
- Constant velocity diagrams across the blade due to prismatic blades ;
- Less tip leakages and disk friction losses ;
- Tip speed is limited by the low speed of sound.
All this leads to a more efficient machine, rotating at low revolving speed and having very low vibrations and noise level.
Proven technology with approx. 500 MWe in operation worldwide.
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