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Publication Name: The First Geothermal Organic Radial Outflow Turbines 2015
Original File Name Searched: 26053.pdf
Page Number: 001

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Proceedings World Geothermal Congress 2015 Melbourne, Australia, 19-25 April 2015

The First Geothermal Organic Radial Outflow Turbines

Claudio Spadacini, Marco Frassinetti, Anthony Hinde, Simone Penati, Matteo Quaia, Dario Rizzi and Aldo Serafino Exergy, Via Santa Rita, 21057, Olgiate Olona (VA), Italy


Keywords: ORC, Radial outflow turbine, geothermal binary power plant, multi pressure, experimental results, Bagnore, Denizli- Tosunlar.


In the last years a new turbine technology for geothermal energy exploitation has been developed, engineered, manufactured and tested by Exergy : the organic radial outflow turbine.

The radial outflow turbine technology has several unique characteristics which qualify this innovative configuration as advantageous for many geothermal applications, as it ideally matches the process conditions typical for geothermal organic binary power plants.

The purpose of the present article is to analyze the performances encountered in the first installation of the organic radial outflow turbine in a geothermal field, the Bagnore power plant of ENEL Green Power, and the current and future development of such turbine configuration for multi pressure level cycles.


It is well documented that for binary geothermal power plants axial turbines with an overhung configuration have traditionally been the selected design. In fact, despite other configurations having been proposed in the market, such as the radial inflow turbine, the overhung axial arrangement is the reference configuration in the geothermal field, having been developed since more than 50 years and representing nowadays the most common turbine technology (Di Pippo, 2005).

Recently a different solution has been reconsidered as a suitable turbine technology for expanding organic vapor in geothermal binary power plants: the radial outflow turbine.

This technology has been developed in the early 20th century by Ljungstrom (counterrotating) and Parsons to expand steam (Dixon,1998).

The expansion of a working fluid vapor in a radial outflow turbine is shown in Fig. 1 : the fluid enters the turbine disk axially in its center and expands radially through a series of stages mounted on the single disk. At the discharge of the last rotor the flow go through a radial diffuser and is then conveyed to the recuperator and/or condensation section of the system, through the discharge volute.

Figure 1: 3D cross section of the radial outflow turbine.


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 Supercritical Fluid Extraction The First Geothermal Organic Radial Outflow Turbines 2015 Page 001
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