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recommendation on 2-speed swimming pool pump - Page 5

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Posted by krw@att.bizzzzzzzzzzzz on November 1, 2010, 11:10 pm
On Mon, 1 Nov 2010 07:07:22 -0700 (PDT), trader4@optonline.net wrote:

Stop feeding the trolls.

Posted by Josepi on November 2, 2010, 3:22 am


Stop feeding the trolls.

On Mon, 1 Nov 2010 07:07:22 -0700 (PDT), trader4@optonline.net wrote:

Posted by krw@att.bizzzzzzzzzzzz on November 2, 2010, 4:16 am

Top-posting liar.

Posted by JimT on November 1, 2010, 2:23 am

Why would you comment?


Posted by DD_BobK on October 30, 2010, 5:57 pm
Per another post, I too have had good (but limited) experience with
Hayward pumps.

Unless you need at new pump/motor right now, I would not recommend
replacing a perfectly good one just to get the reducing energy usage.
But the decison really depends on "the numbers".

The whole idea of using a two speed or variable speed is to reduce the
flow rate through the system (gpm) ......
The power needed to do the job of circulating the water is represented
by the product of flow rate (gpm)  & system pressure loss (psi)
through the system.

Reducing the flow rate (say from 80 gpm to 40 gpm),  the pressure loss
through will only be 25% of the original since pressure loss though is
piping system goes roughly by gpm squared.
and since the flow is down by 50%.......    50% of 25% is 12.5%, so
the pump will only be required to supply 1/8 the original power.

But since you;re only moving 40gpm, you'll have to run the pump twice
as long to filter the same amount of water per day and get comparable
cleaning performance.
This will still result in reducing your daily power consumption by
75%  (if the pump is only run on low speed).

Your actual savings will depend on how you operate the new system, the
of low speed & high speed operation.

If you currently run your one speed pump 6 hours per day ....that's
about 75c to $ per day.
If you save 75% to 50% of that (depending on speed mix) that would be
about 60c or 70c per day.....
$50 per year, not bad.

How much does a new pump / motor, new controller & installation cost?
This sounds like a very good ROI and a payback in a few years.

Of course the best way to save money on keeping the pool clean,
 is to reduce running time until the pool is no longer as clean as
you'd like and then add some running time.

This game can also be played with you new system.

When I had a pool, I used cut back running time based on season, pool
usage, dirt loading.
Winter in SoCal, don't use much chemicals, pool usage (not heated) was
way down so I ran only a few hours perd day.
Summer usage required much more run time.
Giant party (parents away) required extra chlorine & increased run

And keep your eye on your Pool Man......
I would reduce the run time, he would increase it. He preferred to
spend my electricity to help him look good.  :)


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