Hi Carl,
Yes there are some options.
If you use a good pressure activated switch, you can turn on/off slow
opening electric valves as flow changes.
IE so as the flow drops, the pressure drops and at the activation
point, the relay closes one or more valves allowing the pressure to
build up at which point the valve will open again.
For finer regulation you might need more than one valve to have a
relay and more than one pressure switch.
Its can be pretty expensive, but it does work.
What voltage is the turbine? This helps to know if you can use the
turbine power to control the valves.
thanks,
jay
peltz power
On Sep 29, 2008, at 9:36 PM, Carl Emerson wrote:
Hi there gang,
We are looking at a 4kW PM hydro for a client and was wondering if
anyone has done an automated control of flow into such a unit so as
to limit the amount of water being taken from the stream in the
Summer.
This is usually done manually by closing down nozzles on the unit
but here in NZ weather changes fast and the unit is 500M from the
house. Summer rains can be significant and sudden.
We are planning a 6inch pipe with around 100 ft of fall, the stream
when low will allow a flow of 20Litres/sec but when high will
deliver twice that amount.
Any suggestions??
Thanks
Carl Emerson
Freepower Ltd.
Auckland NZ
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