This article compares the bladed rotors for hydro energy conversion systems.

Type Moment of force output/size of device Fabrication requirements Difficulty of production Durability Difficulty of repair Production cost Hazard to fish ?
Devices for continous flow (rivers, ...)
Hydraulic wheels
Undershot water wheel (general) ? ? (20% efficient or less)[1][2] ? ?? ? ? ? no (AC)
Undershot water wheel (Sabegien) ? ? (?% efficient)[3][4] ? ?? ? ? ? no (AC)
Undershot water wheel (Poncelet) ? ? (?% efficient)[5][6] ? ?? ? ? ? no (AC)
Undershot water wheel (Zuppinger) ? ? (?% efficient)[7][8] ? ?? ? ? ? no (AC)
Breastshot water wheel (general) ? ? (35-45% efficient) ? ?? ? ? ? yes (UP)
Overshot water wheel (general) ? ? ( 55-70% efficient) ? ?? ? ? ? yes (UP)
Overshot water wheel (Pitchback) ? ? (55-65?% efficient) ? ?? ? ? ? yes (UP)
Devices for tides and tidal streams
Francis turbine ? ? ? ?? ? ? ? ?
Kaplan turbine ? ? ? ?? ? ? ? ?
Propeller turbine ? ? ? ?? ? ? ? ?
Bulb turbine ? ? ? ?? ? ? ? ?
Tube turbine ? ? ? ?? ? ? ? ?
Straflo turbine ? ? ? ?? ? ? ? ?
Tyson turbine ? ? ? ?? ? ? ? ?
Archimedean screw turbine ? ? ? ?? ? ? ? ?
Pelton turbine ? ? ? ?? ? ? ? ?
Turgo turbine ? ? ? ?? ? ? ? ?
Michell-Banki turbine ? ? ? ?? ? ? ? ?

Note: AC means in all circumstances UP means unless precautions are taken (eg creation of a tail race and lockoff from fish of this tail race by a grating)

References[edit | edit source]

See also[edit | edit source]