New Topic - Water Pressure [RE-wrenches]

[Bob-O Schultze, Electron Connection]

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Carl,
I've recently had goos success with the Grundfos SQ/SQE series of ac 
submersible pumps. They use a PM motor and have soft start feature 
that greatly reduces the high surge. Find them at www.grundfos.com. 
Their USA site is www.us.grundfos.com. They also have downloadable 
application and installation manuals. Handy.
Cycling on and off can be reduced by going to a larger pressure tank.
Good Luck, Bob-O

>Hullo there...
>
>I am inviting comment on one of the most difficult problems I face.
>
>In a remote installation the most common way in NZ to achieve water 
>pressure for a residence is to use an
>AC pump with a small pressure chamber.
>
>This is when the client does not want to have a 'header tank' on a high stand.
>
>Now this 'on demand' water pressure system is very energy hungry. 
>Typically the pumps have a high surge
>start and cycle on and off constantly under low flow demand conditions.
>
>Now one approach is to replace the AC pump motor with a DC 
>equivalent. Over here 48 Volt 1.5 HP motors
>are hard to find. If you can get one then this will help to solve 
>the problem, it will also reduce the
>light flicker every time you turn on a tap.
>
>So I wondered if anyone had come up with another solution because as 
>it stands water pressure is one of
>the most energy demanding elements of the overall system design.
>
>  Thanks for your thoughts...
>
>Carl Emerson
>Manager
>FREEPOWER LTD.  "Harnessing Natural Energy"
>P.O. Box 10-1207 N.S.M.C. Auckland, NEW ZEALAND.
>Ph. 09 4275206 fax 09 4275208  cell 021-633999  web www.freepower.co.nz

-- 
Bob-O Schultze, Electron Connection
PO Box 203, Hornbrook, CA 96044
800.945.7587 or 530.475.3402
fax 530-475-3401
www.electronconnection.com

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