An over-sized pump forces too much water, adding energy costs that do not pay off in increased flow. It can also increase velocity above the recommended seven feet per second(fps).
When water travels faster than recommended through the pipes, which greater horsepower pumps do, you increase the friction in the pipes, and create an inefficient system that does not filter the water any better.
Let’s compare it to fuel economy in your car. You get better gas mileage driving 55 or 60 mph than you do going 75mph or faster. This is because at higher speeds you encounter more resistance(friction).
The same thing happens when water travels faster than it should through a certain size pipe. Slowing down the water is a good way to reduce friction loss, and lower friction loss means less energy consumed by the pump.(Lower friction loss means less energy needed to move the water at the same speed.)
One way to determine the ideal pump size size for your pool, is to know the pool’s volume and turnover rate. Say it’s a 16′ x 32′ pool with 18,000 gallons of water. Divide 18,000 by six hours,(actualy 18,000 by 360 minutes), and you get 50 gallons per minute.This is the gallons per minute (flow) you need to turnover the pool water in six hours or, if the filtration system runs around the clock, you can turnover four times in 24 hours.
Take that number to a pump curve, (supplied by pump manufacturer), and you’ll find that a 1/2hp. pump will do the job with the 1.5inch pool plumbing. A larger horsepower pump might do the job faster, and a smaller pump might take longer, but it will use less energy overall. And the smaller pump will, filter the water, and disperse the chemicals, just as well.
But in most residential pools, we have fittings, elbows, and valves, which add to the friction loss. So, you probably will need a 3/4hp or 1hp. pump to move the same water . When you put a 1-1/2hp or 2hp pump on your pool, all that you are doing is adding 50% or 100% to the daily cost of electricity to run your pool system. In most cases, unless you have some waterfall or spa jet features, or extra long pipe runs,etc. you should not need these larger horsepower pumps.
more to come at a later date…from Rich DeMarco: www.paradisepoolandspa.com
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