“The extraordinary conclusion I had, after different tests and analysis was that the Ljungström turbine even if years old, had optimal performances that even the modern axial turbines didn’t reach. This experience was crucial for me, and led me to the idea of using the Radial Outflow turbine for ORC cycles”

C. Spadacini

Conceptualized by EXERGY founder, Claudio Spadacini, The Radial Outflow Turbine (ROT) was launched in the market in 2009, becoming a world first in the ORC industry and recognizing Exergy as a game changer in the marketplace.
 

The key feature of the Radial Outflow Turbine configuration is the capacity to convert the energy contained in the organic fluid into mechanical power with higher efficiency than competing technologies on the market such as the traditional axial or radial inflow turbine.

Before the ROT, the main players of the ORC sector were focused on finding innovative solutions to improve the cycle efficiency, but were considering, the only two at the time available, turbine configurations: axial or radial inflow.

EXERGY’s innovative turbine design perfectly responded to the markets’ need for efficiency and performance in lower temperature heat sources application.

Most of the characteristics of Radial Outflow Turbine technology, covered by multiple IP rights, entail several advantages:

NATURAL ACCOMODATION OF WORKING FLUID EXPANSION
NATURAL ACCOMODATION OF WORKING FLUID EXPANSION
  • Along its expansion, the fluid encounters greater face area, causing taller blades in the first stages and shorter blades in the last ones, thus allowing a broader range of applicable fluid conditions
LOW SPEED TURBINE
LOW SPEED TURBINE
  • No gearbox
  • Higher reliability
  • Low noise
  • Longer life of the bearings
STRAIGHT BLADES AND RADIAL DESIGN
STRAIGHT BLADES AND RADIAL DESIGN
  • Minimum 3D effects and turbulence
MECHANICAL GROUP EASY TO EXTRACT
MECHANICAL GROUP EASY TO EXTRACT
  • No fluid loss or drainage
  • Easy and fast maintenance
  • Less tip leakage and disk friction losses
  • No “overhaul” maintenance on the turbine
SIMPLE DESIGN
SIMPLE DESIGN
  • Compact design and simpler and easier construction
STANDARD MECHANICAL DESIGN FOR EACH TURBINE FRAME
STANDARD MECHANICAL DESIGN FOR EACH TURBINE FRAME
  • The fluid-dynamic design of each turbine is optimized in order to reduce supply time, guaranteeing maximum efficiency without need for mechanical redesign
MULTIPLE PRESSURE ADMISSIONS POSSIBLE ON A SINGLE DISK
MULTIPLE PRESSURE ADMISSIONS POSSIBLE ON A SINGLE DISK
  • Cost effective solution
  • Less limitations on cycle pressure
  • 20% more power than a single level system with a simple configuration
  • Suitable for low temperature heat sources, as low as 90° C
UP TO 7 STAGES ON A SINGLE-DISK TURBINE
UP TO 7 STAGES ON A SINGLE-DISK TURBINE
  • Better Exploitation of high enthalpy resources
  • Extreme flexibility for changing geothermal fluid conditions, in terms of flow, temperatures and constituents
  • Up to 6% additional efficiency over the axial turbine
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Radial Outflow Turbine
Case studies