Fwd: booster pump for water line [RE-wrenches]

[Windy Dankoff, Dankoff Solar]

<x-flowed>>Windy - Great approach - I use a questionaire to help evaluate 
>potential hydro sites - soon I'll have it up on my web site. This 
>tends to separate the tire kickers from the real site owners and 
>makes it possible for me to say either - Sorry folks noway - or lets 
>looka at this - here is a rough estimate of cost. If a dealer front 
>ends with a questionaire and a quick ballpark price it often saves 
>time and heartbreak. Like Pumps - micro-hydro sites are "site 
>specific".
>     Best Ron

Ron,

While you're at it, you'll appreciate this tool. I've copied it from 
our site at:

http://dankoffsolar.com/reference.html

Look for the article under Water Supply:
Calculation Guide for Solar Water Pumping Systems

Here's the handy formula that will let you estimate the watts 
required for a proposed job even if you have no idea what sort of 
pump you would use. It is very helpful to determine feasibility or 
otherwise, especially when a farmer calls you about replacing his 50 
HP pump!



DETERMINE POWER REQUIRED TO PUMP WATER

This is useful for estimating the cost and feasibility of any pumping 
system, even if the specific pump is unknown.

              In American Units:

              WATTS=
                       FEET X GPM X 18.8   divided by  PUMP EFFICIENCY %



              In Metric Units:

              WATTS=
                       METERS X LPM X 16   divided by  PUMP EFFICIENCY %



              Feet or Meters = Total Dynamic Head
              Pump Efficiency is "wire to water" (includes motor and 
pump losses)
              Average efficiency for solar pumps is ~ 45% (varies 30 to 60%)
              Enter Efficiency as a whole number: For 45% enter "45"


              TO DETERMINE THE EFFICIENCY of a proposed or existing 
pump system, invert
              the above equation to solve for pump efficiency.

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