showing time duration and run time in wavesurfer

Again, many people on this forum have found that short run times are just as effective as long even with a VS pump at low speeds. So if there is no improvement in water quality after a few hours of run time, why are you recommending 23 hrs to your clients? This is a waste of energy no matter what the speed of the pump. The study I quoted showed that there was no significant improvement in water quality after about 2 hours of run time and the old requirement of a turnover per day is not necessary. The comments were specifically about run time. The comments were not about the power savings of a VS, that is well known here. There is a relationship between hydraulic HP and electrical HP (wire to water) but for every pump with a motor, it is not 1:1 because both the motor and drive lose efficiency as RPM drops.īut I think you missed the point of our comments. hydraulic power) that changes by about 1/8th. However, affinity laws apply only to pumps and not motors or even VFDs so the electrical power draw does not change by a factor of 1/8th, it is the power delivered to the water (i.e. Being an Electrical Engineer myself, I understand the theory quite well. Most of the regulars here on the forum are fairly well versed in the theory of pumps (see hydraulics 101 sticky in my sig) and especially the affinity laws. By the way, I am located in California where the electrical rates are high. This is a great discussion and look forward to more comments. Making sure all the equipment that is speed dependent is met (salt system, heater is pool is heater all the time, etc) Water tension is lost over 50gpm with most skimmersģ. Optimum skimming is obtained around 30-50gpm. Making sure the pool filter fills completely with water so the filter is able to do it's job.Ģ. I always like to say a pool is like a fingerprint, everyone is different.ġ. There are other variables to determining the lowest possible speed for a specific pool. We determine that at 80% the VS Pump is pumping the same amount of water at the old Single Speed pumpĪt 80% 56gpm X 60min X 8hrs (26,880gals) 1013 watts an hour X 8 hrs = 8104 watts 8.1 KWĪt 40%28gpm X 60min X 16hrs (26,880gals) 161 watts an hour x 16 hrs = 2576 watts or 2.6KWĪt 30%22gpm X 60min X 22 hrs (29,040 gals) 86 watts an hour X 22 hrs = 1892 watts or 1.9 KWĪt 25%18gpm X 60min X 24 hrs (25,920gals) 60 watts an hour X 24 hrs = 1400 watts or 1.4 KW The key is everytime you cut the speed in half the energy used is reduced drastically. 1/8the Electrical Consumption (approximately).¼ the Head in feet (slower moving water creates lower TDH).Hi Everyone, first and foremost is getting familiar with the Pump Affinity law.Īffinity Law (remember 3450 rpms at high speed) Circulation is just one issue among many, and not usually one of the more important ones. There are a number of criteria to balance out.

Far less circulation is perfectly fine in nearly all cases. In a technical sense, you are probably right. Most of the variable speed pumps currently available are less energy efficient at their lowest possible speed, hitting optimal energy efficiency at speeds just a bit higher than that. Especially with the trend towards having more skimmers these days the lowest possible speed often won't be sufficient to clear surface debris, though this will vary from pool to pool.įinally, 'lowest possible speed' isn't always such a great idea. Skimmers need a certain minimum flow rate to skim effectively. You can save a huge amount on electricity by running the pump for far less time, and circulation will still be just fine with only 4 to 8 hours of pump run time (assuming a residential pool).Īlso, many pools will not get skimmed effectively at the lowest possible speed. What people seem to care about the most these days is saving money on electricity. Click to expand.In a technical sense, you are probably right.

Showing time duration and run time in wavesurfer