Calculate the flow rate that will be required to meet the customers demand to filter the...

  

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Calculate the flow rate that will be required to meet the customers demand to filter the pool every 6 hours. Next, apply a Factor of Safety (FS = 1.5) to the calculated flow rate. You will use this value when selecting a pump for the system. Typically swimming pool systems should filter all of the water in an 8-hour period. However, this homeowner wanted to filter their pools water ever 6- hours. • Assume the filter has been sized properly by the contractor. • Ignore the effects of flow through the filter and salt cell. That is, you will treat that section as PVC pipe with one 90° Standard elbow. Let all pipe be 32mm PVC Plastic Pressure Pipe (Appendix G.3) • Let all elbows in the suction system be 90° Standard elbows (Table 10.4) with a resistance coefficient of K=30fr. There is one standard Tee with a resistance coefficient of K=60fT. The homeowner has five 0.75in plastic globe valves (K=340fr) that he wants you to use. The valves can carry 15 gal/min of water [Table 10.6]. • The design for the three suction lines from the pool is a sudden enlargement flow path. ● The water is maintained at 77°F (25°C). • You want a pump that operates at 78% efficiency. ● The energy equation for this system is shown below. Assume p₁ = p2 =0. ²+z₂+ v2²22 2g Y v²/ +Z₁ + +hA-h₂ 29 = P2 Y Calculate the flow rate that will be required to meet the customers demand to filter the pool every 6 hours. Next, apply a Factor of Safety (FS = 1.5) to the calculated flow rate. You will use this value when selecting a pump for the system. Typically swimming pool systems should filter all of the water in an 8-hour period. However, this homeowner wanted to filter their pools water ever 6- hours. • Assume the filter has been sized properly by the contractor. • Ignore the effects of flow through the filter and salt cell. That is, you will treat that section as PVC pipe with one 90° Standard elbow. Let all pipe be 32mm PVC Plastic Pressure Pipe (Appendix G.3) • Let all elbows in the suction system be 90° Standard elbows (Table 10.4) with a resistance coefficient of K=30fr. There is one standard Tee with a resistance coefficient of K=60fT. The homeowner has five 0.75in plastic globe valves (K=340fr) that he wants you to use. The valves can carry 15 gal/min of water [Table 10.6]. • The design for the three suction lines from the pool is a sudden enlargement flow path. ● The water is maintained at 77°F (25°C). • You want a pump that operates at 78% efficiency. ● The energy equation for this system is shown below. Assume p₁ = p2 =0. ²+z₂+ v2²22 2g Y v²/ +Z₁ + +hA-h₂ 29 = P2 Y

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