Energy Efficient Pool Pump?

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SarahSmile1

Energy Efficient Pool Pump?

Postby SarahSmile1 » Wed 07 Jan, 2009 18:04

Hey everyone.
So, I have just bought a new house which has a pool. I don't know a huge amount about pool pumps, but I have been told that I need to get a new pump as the current one is about to die. I have been looking for the most energy efficient pump as I'd love to do my bit to reduce my energy bills.

Can anyone tell me if the Pentair Intelliflo is worth the money over the Whisperflo? A guy in the shop said they were pretty much as efficient as each other, but would love to hear a second opinion.
Many thanks for your help!!


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Postby chem geek » Wed 07 Jan, 2009 21:39

See my response here .
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Postby Rick Sass » Thu 08 Jan, 2009 13:00

So Richard -

I have an elevated spa spilling over into my IG pool in SW FL. I do have solar and currently I'm using a 3/4 hp booster pump in addtion to my single speed 1 hp sta-rite pump. This pump and motor are about 13 years now and I was wondering if it would be a wise idea to replace the system pump and solar booster pump (which is 1 year old) with the Intelliflo VS or VF?

I am using the Aqua Logic automation system with their salt generator. The return lines are all 1.5" and the suction line for the spa is 2" and the suction line for the pool is 1.5" up to the pump and then it's 2" between the pump and filter which is a 100 sq. in. cartridge filter. The solar is 1.5" supply and return.
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Postby chem geek » Thu 08 Jan, 2009 15:31

You may be able to use a single Intelliflo for your pool and solar, though 1.5" pipe for solar, if the system is large and on a roof, isn't very good. That's a lot of wasted energy due to the high dynamic head and 2" lines would have been much better to/from the solar. You should have a competent PB review your situation for pump sizing.

You mentioned that you have a spa and that's another matter. Usually to get enough flow for multiple jets you need a separate pump for the spa. However, it doesn't sound like you are using a separate pump for your spa so if you are happy with the current spa situation then the Intelliflo may be able to handle that as well though probably not being able to have the spa jets on at the same time as the solar. Again, a competent PB should be able to help you figure that out.

The Intelliflo pump, either the VF or VS, has variable speeds (the VF just has a flow meter to adjust the speed to maintain constant flow rate) and can go up to 3450 RPM. The flow rate at this speed drops quickly above around 90 feet of total head (at 89 feet it's 60 GPM, but drops to 0 GPM at 96 feet). Peak efficiency at this RPM is at 100 GPM and 77 feet of head. Dynamic head loss with 1.5" pipe at 100 GPM is about 46 feet of head per 100 feet so that means an effective pipe length of around 170 feet which isn't very much. If you had 2" pipe, then at 100 GPM this is about 13.5 feet of head per 100 feet so an effective pipe length of around 570 feet which is much better.

Having individual return lines at 1.5" is OK if there is more than one and they come together into a 2" (or larger) pipe to the pump. Having 1.5" suction lines is also OK if there is more than one which there usually is since you've typically got a skimmer and floor drains, but again these should come together into a 2" (or larger) pipe to the pump. It sounds like your plumbing situation may limit your options and require you to have more pump power than you would otherwise need.

Richard
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Postby Rick Sass » Fri 09 Jan, 2009 12:40

Thanx Richard -

Competent PB and SW FL is not going to happen. It's pretty bad over here considering all the pools we have down here.

I do not have a separate pump for the spa - the flow with the solar enabled is just fine and I do have a "blower" which when turned on really does the trick.

So would you recomend replacing the 1.5" supply and return lines for the solar? I have 16 "panels" and the distance as the pipe goes from the panels to the booster pump is a run of 50' per run.
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Postby chem geek » Fri 09 Jan, 2009 23:45

Well, you could replace the 50' 1.5" pipe (each way, so 100' total) with 2", but let's see what that does. This will also help you save on electricity costs. I'm not sure what kind of solar panels you use, but if they are like these , then the optimal flow rate is 4 GPM per panel. 16 panels is a lot and would be 64 GPM. The head loss through 100' of round-trip 1.5" pipe at 64 GPM is 20 feet while the head loss using 2" pipe at 64 GPM is only 6 feet. So it's a difference of 14 feet of head (6 psi). That's not horrible so unless you can do it relatively inexpensively, it's probably not worth it. In terms of energy savings, it might save you around 200 Watts or so of pump electricity power.

Richard
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Postby Rick Sass » Sun 11 Jan, 2009 13:18

Thanx Richard -

This is the solar system I'm using: http://www.heliocol.com/ .
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Postby chem geek » Mon 12 Jan, 2009 00:10

Unfortunately, I couldn't find any detailed specs so I don't know the efficiency vs. flow graph nor the flow rate vs. head graph for your panels. Such detailed data is provided for FAFCO panels here , for example.

So I don't know what to tell you. If you were to save 200 Watts when your pump is running with solar, say at least 4 hours a day, then at 20 cents per killowatt-hour, that would be 16 cents per day or about $4.80 per month. So it would take a while to pay back replacement of your pipes so wouldn't be worth it unless you were concerned about lowering your energy profile (i.e. how much energy you use) even if it cost you to do so.
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Postby Rick Sass » Mon 12 Jan, 2009 14:36

Richard

I re-read one of my earlier posts to you and I mistyped the length of the return and supply pipes for my solar system. It is 100' for the supply and 100' for the return. Does this make a difference in your calcualtions?
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Postby Rick Sass » Mon 12 Jan, 2009 15:42

Richard -

Here is the technical info my solar system. FYI - I am using 11 of the HC-50 and 5 of the HC-40.

Thanx again.

Well I thought I send the info, but it's in a pdf format and I don't know how to include that file type into this message...

When I look at the technical info, it state that the flow is 5 gpm and the chart for the head loss per flow rate shows at 5 gpm a head loss of .420. Does this help?

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