Water at 20°C is to be pumped from a reservoir (ZA = 2 m) to another reservoir at a higher elevation (ZB = 9 m) through

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Water At 20 C Is To Be Pumped From A Reservoir Za 2 M To Another Reservoir At A Higher Elevation Zb 9 M Through 1 (148.9 KiB) Viewed 47 times

Water at 20°C is to be pumped from a reservoir (ZA = 2 m) to another reservoir at a higher elevation (ZB = 9 m) through two 25-m-long plastic pipes connected in parallel. The density and dynamic viscosity of water are 998 kg/m3 and 1.002x10-3 (kg/m.s). Plastic pipes are smooth, and their roughness is zero. The diameters of the two pipes are 3 cm and 5 cm. Water is to be pumped by a 86 percent efficient motor-pump unit that draws 7 kW of electric power during operation. The minor losses and the head loss in the pipes that connect the parallel pipes to the two reservoirs are considered to be negligible. Determine: a) The total flow rate between the reservoirs (50 points). b) The flow rates through each of the parallel pipes (50 points). Reservoir B 2B = 9 m 25 m 3 cm Reservoir A 2A = 2 m 5 cm Pump