[RE-wrenches] Micro Hydro control

[Walt Ratterman]

There are mechanical control systems that automatically control the flow
(such as the old fly-ball mechanisms), but these are very expensive, and
generally not such a good idea until you get up to the larger sizes.

The introduction of electronic load control (where you accept all of the
flow and produce 100% of the electricity, but divert what you don't need)
has made the control systems much more affordable.

The use of the MPPT controlling is probably a good solution for this, but
this (as far as I understand it) is not controlling the water flow, but the
electricity flow...
Walt

-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Darryl
Thayer
Sent: Tuesday, September 30, 2008 7:35 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Micro Hydro control

HI I should not speak, but, I thought the nozzel had to be sized to the flow
to attain efficiency.  So if you have a 4 kW it can not be throtted except
by changing nozzle size or stopping the flow in some nozzles, does this mean
you could use solinoid valves?  Also a MPPT controller for Hydro would be
better?  See I dont know about this.
Darryl


--- On Mon, 9/29/08, Carl Emerson <freepower at freepower.co.nz> wrote:

> From: Carl Emerson <freepower at freepower.co.nz>
> Subject: [RE-wrenches] Micro Hydro control
> To: "'RE-wrenches'" <re-wrenches at lists.re-wrenches.org>
> Date: Monday, September 29, 2008, 11:36 PM
> 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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