24 The point where the performance curve for a particular pump intersects the system curve determines the flow and Total Dynamic Head where that pump will operate. In this example, the flow for the 3/4 H.P. pump is between the minimum and maximum flow and is therefore properly sized for the application. Saving Money by Saving Energy Depending upon utility rates, pool characteristics, and equipment selected, the energy and dollar savings from an energy efficient single, two, or variable speed pump compared to a standard single speed pump can be quite significant. For example, a system featuring an energy efficient high performance pump drawing 5.34 amps at 230 volts where the local utility rate is $0.12 per kWh will cost you approximately $1.78 over a 12 hour period per day. A standard pump drawing 7.0 amps will cost you approximately $2.32 per day or an extra $197 annually! Use this worksheet to help determine your energy savings: A. Motor Amp Rating A B. Voltage (e.g. 115 volts or 230 volts) B C. Local Energy Rate ($ per kWh)* C D. Approximate Power Usage (Watts) = A x B** D E. Kilowatts = D / 1000 E F. $ per hour = E x C F G. Hours of Operation G H. Cost per Day = F x G H J. Monthly Cost = H x 30 J K. Yearly Cost = H x number of months pool is in operation K NOTES: *Refer to your utility bill to determine local rate **Estimated. It is recommended to use a wattmeter to determine the actual power consumption. Visit https://hayward.com/why-hayward/explore-products/better-pumps to calculate your local energy savings and learn more about energy efficient pump solutions. 4C. Filter Sizing A filter, be it DE, sand, or cartridge, has a Design Flow Rate in GPM as well as a Turnover Capacity in Gallons. See the table below for example. The specific performance data for Hayward® filters is provided in the Filter Section of this Buyer’s Guide. Select a filter that meets or exceeds both the desired flow rate and turnover capacity in gallons. Filtration is a category where truly “bigger is better” as a larger size will hold more debris and extend the time between cleaning. Model Number Effective Filtration Rate Area Design Flow Turnover Capacity (Gallons) 8 Hours 10 Hours S180T 1.75 ft2 35 GPM 16,800 21,000 S210T 2.20 ft2 44 GPM 21,120 26,400 S220T/T2 2.64 ft2 52 GPM 24,960 31,200 S244T/T2 3.14 ft2 62 GPM 29,760 37,200 S270T/T2 3.70 ft2 74 GPM 35,520 44,400 S310T2 4.91 ft2 98 GPM 47,040 58,800 S360SX 6.50 ft2 130 GPM 62,400 78,000 Desired Flow: 50 GPM Turnover 21,120 gallons in 10 hours Select S220T (minimum to meet Desired Flow and Turnover) One additional factor to consider in filter sizing is bather load. Busier pools require larger filters. Also, larger filters provide longer cycles, reducing everyday maintenance required by the consumer during the pool season. Summary Using the information calculated above, you can properly size the pump, filter, and corresponding equipment, assuring you meet Turnover Rate and Water Velocity requirements while eliminating the electrical waste and potential damage to other system components associated with a needlessly oversized pump. Hydraulics THE BASICS OF PUMP/FILTER SIZING 0 0 70 90 Friction Loss 0 System Curve y Curve Cuur Existing Pump 1 H.P. Correct Size Pump 3/4 H.P. Flow 50 P u m p s
