Question

You have been asked to design a similar pump from the existing one. The existing pump works for water is of impeller diameter equals 6 cm and its performance data is shown here when working at 1725 rpm. The newly design pump is for a refrigerant (R-134A) and it must produce 450 cm of head at 1600 rpm when working at its best efficiency. One of your colleagues did preliminary analysis and develop the performance curves in dimensionless form for the existing pump family which is also shown below

Question No. 2: (15 You have been asked to design a similar pump from the existing one. The existing pump works for water is

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DATE = 6 cm For existing pump: (pump) D RPM, N,= 1725 rpm density of water , Sw= 1000 kg/m3. For new pump: (pump 2) H₂ = 450DATE D2 = 11.20 cm Aus b 3 At best efficiency point, from the given curve, volumetric officiency flow rate = 1.1x100cm 110 cmDATE @ Free Free delivery - flow that 7.7 7. can makinium occur 1.8 X 100 - cm3 s 180 cm² s sus1.6 shut off head CX 10 BEP → Best efficiency point. 0.8 0.6 Free delivery head 0.9 0.2 Powere at eest efficiany Cpx 100 Free

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