Patent ID: 8226376

Claim:
A pressure exchanger for transmitting pressure energy from a first fluid flow to a second fluid flow comprising: a housing ( 2 ) having an entry ( 14 a ) and an exit ( 12 a ) for the first fluid flow and an entry ( 14 b ) and an exit ( 12 b ) for the second fluid flow; a rotor ( 4 ) arranged in the housing ( 2 ), the rotor ( 4 ) comprising a multitude of channels ( 10 ) which extend radially distanced to a rotation axis (X) of the rotor ( 4 ), from a first axial end of the rotor ( 4 ) to an opposite, second axial end of the rotor ( 4 ), the rotor ( 4 ) arranged with respect to the entries and exits ( 12 , 14 ) in a manner such that on rotation of the rotor ( 4 ), in each case in an alternating manner, the channels ( 10 ) connect the entry ( 14 a ) for the first fluid flow to the exit ( 14 b ) for the second fluid flow, and the entry ( 12 b ) for the second fluid flow to the exit ( 12 a ) for the first fluid flow; a drive motor ( 22 ) connected to the rotor ( 4 ) and via which the rotor ( 4 ) is driven in rotation; and a motor controller connected to the drive motor and via which the rotational speed of the drive motor ( 22 ) is controlled such that a mixing zone, in which a mixing between the first fluid flow and the second fluid flow occurs, is always situated inside the channels ( 10 ).