- February 2018
By
5 February we had built a sufficiently well-structured enclosure
around the relocated generating machinery to allow us to test its
effectiveness in limiting the noise which was of some concern. At
the time of writing, the generator has been running for 21 days and
it is believed that the objective of reducing noise to an acceptable
level has been achieved.
Enclosure
Construction:
As
mentioned in previous Newsletters, the decision was taken to reduce
the noise by lowering the generating machinery from waterwheel axle
height down to a level deeper into the rock cleft in which the
waterwheel is built, and to bolt the machinery upon a concrete block
of considerable mass, using anti-vibration mountings. The generator
was then to be driven from the waterwheel axle via a massive sprocket
and chain, at a reduced speed of rotation. This approach gives a more
sedate appearance to its rotation and enables the buckets to be
filled more completely.
The
generator machinery, gearbox and motor/generator were enclosed by a
housing made of two leafs of solid 150mm thick concrete blocks, and
the gap between the leafs was packed with acoustic rockwool
insulation. The roof comprises horizontally laid, 100mm solid
concrete blocks on a steel frame, which is covered with two layers of
plastic sheeting and another layer of heavy rubber conveyor belt
material. The whole is surrounded by a European larch framing,
infilled with river gravel about 50mm deep. The north, west and east
walls have been clad in a European larch. The acoustically insulated
air intake and exhaust box, needed to ensure adequate cooling of the
generator, have been installed in the north wall and door (also on
the north face), so as to prevent any sound which may emanate from
them being directed towards local houses. Thermocouples have been
installed so that the air temperature in the enclosure and that of
the generator casing can be measured.
The
generator was producing about 3.3 kW for the first 15 days and
nights, but with the impending drier weather as we approach the end
of February, the power output is falling gradually and may shut down
temporarily in the near future. The energy produced so far since
commissioning is 1800 kWh, which will realise a Feed-in Tariff
payment of about £450, with all but about £100 being earned in the
last three weeks.
As
this project approaches completion, it has to be said that it would
not have been possible had it not been for the most generous
financial support of Worthington Construction Ltd, and for the
tremendous voluntary efforts of time and expertise of Rod Chilton. A
great deal is also due to the excellent working relationship we have
with Rod Smith and his company, Smith Engineering (GB) Ltd of
Maryport, who designed, manufactured and supplied the mechanics. The
Postlethwaite family at Border Hydro Ltd of Cockermouth were of great
help with all the electrics and negotiating the Feed-in Tariff
paperwork.
The
construction part of the project is now very nearly completed, apart
from some access steps, a low wall to direct water away from the
enclosure doorway, and reinstating the fencing.
Len Watson
Editor’s note :
Len omits to mention that the project has depended on his own massive
volunteer contribution, often single-handed and sometimes in
dispiriting circumstances. The Trust is greatly in his debt.
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