Design and manufacture of high efficiency, flat pack, overshot waterwheels, generating electricity from flows between 100 to 500 litres per second and heads 2 to 6 metres.
Generate electricity 24/7, efficiently and predictably from the watercourse at your premises with our innovative design of an ancient technology.
Smith Engineering waterwheels are built to a high specification following research and development in bucket design and efficiency. The novel design achieves approximately 75% water-to-wire efficiency meaning that payback periods of approximately 7 years can be returned from current feed-in-tariff payments.
To calculate total available power at 100% efficiency is:
Fall (in metres) x Flow (litres per second) x Gravity 9.81
= Power (Watts). e.g. 4.1 x 200 x 9.81 = 8,044 Watts
For 75% efficiency the total available power is:
8,044 Watts x 75% = 6033 watts (6kW)
During construction, the waterwheel components can be lifted in place without the need for heavy lifting machinery, reducing installation time and health and safety risks. This also allows assembly in areas with limited access e.g. rural areas with narrow roads. Annual bearing lubrication is the only regular maintenance requirement and the modular design ensures components are easily replaced if required.
Dependent on their location, the total installation cost of Smith Engineering waterwheels is similar to micro turbines.
- Supplied as flat pack kit
- Simple design - use of bolts instead of welding
- Easy assembly - no requirement for special tools
- Rapid assembly - minimum number of components used (approximately 2 weeks for whole system)
- Cost effective materials - constructed of pre-galvanised laser cut sheet
- Durable - greater than 25 years lifetime
- High water-to-wire efficiency - approximately 75%
- Payback periods of approximately 7 years
- Easy maintenance - only annual greasing required
- Modular design ensures easy component replacement
- Elegant design - attraction for visitors
- Bespoke - each wheel built to customer requirements
Smith Engineering waterwheels are designed and manufactured at our factory in Maryport in Cumbria, England. We offer a turnkey service if required and would be happy to discuss your requirements.
Case Study -
The Langdale Hotel and Spa, English Lake District
Design, manufacture and installation of 6kW electricity generating waterwheel, producing 144kWh of power per day from a continuous flow of 200 litres per second, with a potential to produce 30MWh per year at 70% utilisation.
Facts and figures:
Location: Great Langdale, Cumbria, England
Commissioned: November 2014
Output: 6 kW
Flow rate: 200 l/s
Wheel diameter: 4.1 m
Wheel width: 1 m
Gearbox: Brevini epicyclic 177:1 ratio
Generator: Brook Crompton three-phase, 415V induction motor, power rating of 11kW
Customer & civils: Langdale Leisure Ltd
Connection: Border Hydro Ltd
Trials: Dr Paddy Quinlan
The 4.1m diameter waterwheel is positioned in an existing water supply in one of the old wheel pits of the former gunpowder works, next to The Langdale Estate’s original turbine house which generated electricity for the estate in the 19th century.
The spokes, rims and buckets were all fabricated from 3mm pre-galvanised sheet finished with polyester powder coating. These lightweight components were easily and rapidly assembled using stainless steel nuts and bolts without the need for welding or any special tools on site. Only the wheel hub required welding and this was undertaken at our factory.
Delivery to site as a flat pack kit enabled it to be installed without the need for a large crane which would have been unable to travel down the narrow road to the site. This unique feature allows our overshot wheels to be installed in remote locations where there is restricted access.
Tests undertaken with Dr Paddy Quinlan of the University of Cumbria show that high mechanical efficiencies can be achieved from our overshot wheels. A water-to-wire efficiency of 65% was expected but the tests showed it is over 75%.
Payback at this rate should be approximately 7 years.
The waterwheel was funded through the University of Cumbria’s Renewable Energy Test and Education Centre (RETEC) with funding from Britain’s Energy Coast in partnership with the Nuclear Decommissioning Authority.