Re: Variable-speed pumps: US Dept of Energy guide (May 2012)
Here's a good quote: "For example, if you reduce the pump speed from 3,450 rpm to 2,400 rpm (30% reduction in speed) the wattage drops from 2,000 watts to 593 watts (70% reduction in power)."
And here's another, longer quote:
"A variable speed pool pump will allow the homeowner to achieve the ideal filtration flow rate with the least amount of energy consumption. Variable speed pumps utilize either Permanent Magnet Motors (PMM), which use permanent magnets to create a magnetic field between the rotor and the windings. This configuration is similar to the motors used in hybrid cars. Efficiencies are gained by the magnets working to spin the rotor, as opposed to a standard induction motor that requires additional electricity to induce the magnetic field into the rotor. The PMM motor design is much more energy efficient when compared to the standard induction motor, achieving efficiency ratings of 90% while the average single-speed pump will have efficiency ratings between 30% and 70%. PMM pumps can produce the same gpm flow rate as single-speed induction motors if needed; they simply run much more efficiently."
South Florida - 16,000g Diamond Brite pool, 700g spa & waterfall, Jandy 1400 AquaPure SWCG, Jandy variable-speed 1.5H pump, Jandy 60 DE filter, Jandy heat pump - using Taylor K-2006 kit
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