Most water pumps and turbines are made of a single rotating rotor provided with blades which are mostly shaped as a foil. These pumps and turbines are working according to the principle of the conversion of velocity to pressure and vice versa. This principle follows the theory of Bernoulli and is known as the kinetic flow principle. Due to the hydrodynamic operating properties of these machines, the water velocity inside the machines and the rotational speed of the rotors are relatively high.

Unlike these traditional machines, the RONAMIC technology makes use of the hydrostatic principle. The basic working principle of a hydrostatic turbine is the arising of a positive momentum on both rotors of the rotor set due to the pressure difference of the water between the front and backside of the turbine. This pressure difference is also called “head”. When water is flowing through the turbine in the direction of low water level, power is generated on both rotors.

Due to the hydrostatic principle, the RONAMIC machines have a very high energy conversion rate at low water velocity and hence low rotation speed of the rotors as opposed to the velocity based foil machines which have high energy conversion rate at high water velocity.

Main advantages of the RONAMIC hydrostatic technology compared to kinetic machines are:

· Functions as a turbine, pump, water lock and flow control valve
· High overall efficiency, especially at low velocity/low rpm/low capacity
· Also working when the machine is partly filled with water
· Standardized small sized PTO units: electro generators or hydraulic pumps/motors
· High reliability and low maintenance due to modular build and low number of moving parts
· Use of low cost materials and large building tolerances
· No venturi/diffuser needed
· Fish friendly due to low velocity, low rotation speed and advanced rotor designed

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