Introduction of Hydropower Turbines
There are a number of different hydropower turbine types available that are suited to different heads and flows. We are often asked which the best turbine type is, but the answer is always that there isn’t a ‘best’ but there is a ‘most appropriate’ for your particular site.
For each hydropower turbine type there will be a number of manufacturers who provide turbines of differing performance and quality. In our experience it is always worth buying a good quality turbine with a proven track record, because these will perform day-in, day-out reliably. Also most hydropower turbines have the concrete structures designed around them and in many cases the main casing is cast into the structure, so it isn’t an item you want to change later!
The table below summarises the main hydropower turbines that are available and where you would use them. For the common turbines types we have a lot more detail on the relevant page in the Hydro Learning Centre, so click the link for more information.
Feature of Hydropower Turbines
|Hydropower 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.|
Low to medium heads (2 – 40 metres)
Low to medium flows (0.1 – 5 m3/s)
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.
High heads (greater than 25 metres)
Lower flows (0.01 m3/s – 0.5 m3/s)
Low heads (1 – 5 metres) – though turbines often
more appropriate for higher heads
Medium flows (0.3 – 1.5 m3/s)
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)
Pictures of Hydropower Turbines