Wednesday, September 25, 2013

Hydropower Turbines

Turbine type Typical site characteristics
Archimedean Screw Low heads (1.5 – 5 metres)Medium to high flows (1 to 20 m3/s).For higher flows multiple screws are used.
Crossflow turbine Low to medium heads (2 – 40 metres)
Low to medium flows (0.1 – 5 m3/s)
Kaplan turbine Low to medium heads (1.5 – 20 metres)
Medium to high flows (3 m3/s – 30 m3/s)
For higher flows multiple turbines can be used.
Pelton / Turgo turbine High heads (greater than 25 metres)
Lower flows (0.01 m3/s – 0.5 m3/s)
Waterwheels Low heads (1 – 5 metres) – though turbines often
more appropriate for higher heads
Medium flows (0.3 – 1.5 m3/s)
Francis turbines No longer commonly used except in very large storage hydropower systems, though lots of older, smaller turbines are in existence and can be restored.
For older turbines : Low to medium heads (1.5 – 20 metres)
Medium flows (0.5 – 4 m3/s)