MH_Group25

Micro Hydro: Cotehele Waterwheel: 

Micro Hydro: Cotehele Waterwheel Group 25

Group Members: 

Group Members Paul Bacchus Alina Colling Calvin D‘Souza James Hallam Sharvit Nakrani ( Secretary ) Thomas Pearson (Group Leader)

Outline of Presentation: 

Outline of Presentation

Interested Parties: 

Interested Parties 1. National Trust  the client 2. Nearby Landowners (farmers) 3. Electricity consumers 4. Enivronmental agency ( fish pass) preseving 5. Tamar Valley ( fishing preserving ) 6. Local authority ( planning ) 7. Ofgem ( government authority ) 8. Fishing 9. Local residents

Specifications of Interested Parties: 

Specifications of Interested Parties Design of a Waterwheel : Efficient Waterwheel Eco – friendly Cheap but quality manufacutring Do not disturb fish pass Do not change the landscape significantly Construction doesn‘t disrupt residents on a great deal.

Initial Specification: 

Initial Specification Re design current Cotehele waterwheel. Wheel material to be out of steel Reasons: Relatively strong material. Very Hard material. Easy to obtain.

Map of the region around Mill: 

Map of the region around Mill

Map showing leveling values: 

Map showing leveling values 0.000m -0.450 m -0.740m -1.160 m -1.344 m

Flow duration curve: 

Flow duration curve

Energy production table: 

Energy production table The diameter of the water wheel was calculated by measuring the radius and multiplying it by two. The radius equalled 2.42+0.079577+0.28=2.780m. Where 0.079577m equals the radius of shaft and 0.28m equals the hub.

Cotehele Waterwheel: 

Cotehele Waterwheel

Water Wheel: 

Water Wheel A water wheel is a system for extracting usable power from the water flowing in a river or stream. Waterwheels are often overlooked for generating electricity but can be successfully employed at many low-head micro-hydro sites.

Three Types of Waterwheels : 

Three Types of Waterwheels http:// www.britishhydro.org/waterwheels.html http :// www.whitemill.org/z0028.htm Overshot- and PitchBack Waterwheel: Located at rivers running down hills with pre-existing Head Difference is the direction in which the wheel turns PitchBack Wheels requires a more complex system leading water onto the wheel OverShot Wheels only needs a jet through which the water falls onto the wheel. Straight buckets Breast Shot Waterwheel: Located in areas which only provide only a small head. Wider Wheels Curved Buckets UnderShot Waterwheel: No head Making use of the flow of the rivers Least efficient Width has to be adjusted to the river width Straight paddles.

The Cotehele Waterwheel: 

The Cotehele Waterwheel Made of Wood and Iron

Waterwheel dimentions: 

Waterwheel dimentions

Bucket dimensions: 

Bucket dimensions

Specifications of the Old Wheel: 

Specifications of the Old Wheel

Sketch of working Gearbox: 

Sketch of working Gearbox

Cotehele Mill Generator: 

Cotehele Mill Generator The pictures besides shows the current generator kept in Cotehele Mill.

New ideas about new waterwheel: 

New ideas about new waterwheel Increase in slope of drop box New dimension of drop box Can improve the generator which is kept in the gearbox. We can include a permanent magnet alternator which has capability of producing good amount of power at low rpm.

New sketch of Waterwheel: 

New sketch of Waterwheel

Pros and Cons of the design: 

Pros and Cons of the design PROS CONS Generating electricity using renewable energy. Cost of initial construction Sustainable Possible Disruption to local resident during construction Eco- Friendly Complications during construction Relatively Low payback time Energy produced depends on weather Help to reduce energy demand People may feel as loss of heritage as old wheel being replaced Stronger and Long lasting waterwheel Harmful for fishes during construction

Project planning for term-2: 

Project planning for term-2

What we’ve learnt to date: 

What we’ve learnt to date So far this term we have learnt to work as a group and plan our work and set targets. How to analysis flow data and complete a flow duration curve. To work out values for Q (flow) and produce an energy production table. Finally carrying out a site survey.

Payback time (financial): 

Payback time (financial) Payback time=Estimated capital cost/ annual income. Estimated capital cost=£8000/kW Annual income=energy production=19.9p/kWh+3.0p/kWh Estimated capital cost=8000x(112,932/8760)=£103,134 Where (112,932/8760)= the rated capacity of the turbine in kW which in this case is 12.89 kW.

Payback time (financial): 

Payback time (financial) Annual income=(19.9x112,932)+(3x112,932)=2,586,142p so this =£25,861 So this implies that the payback time will equal 103,134/ 25,861=4 years.

References: 

References Beyond Innovations. (2010). Hydro. Available: http://www.beyondinnovation.co.uk/hydro.htm. Last accessed 14/12/2011 British Hydropower Association. (Not given). Waterwheels. Available: http://www.british-hydro.org/waterwheels.html. Last accessed 14/12/2011 . Environmental Agency Manual Fish Pass Pg- 239 http://www.evans-engineering.co.uk/aboutprojects.cfm Neil. (2008). Building A Waterwheel. Available: http://www.reuk.co.uk/Building-a-Waterwheel.htm. Last accessed 14/12/2011 . Neil. (2008). Introduction To Water Wheels. Available: http://www.reuk.co.uk/Introduction-to-Water-Wheels.htm. Last accessed 14/12/2011 . Ordinance Survey- http://edina.ac.uk/digimap/