Question

Problem #3: The performance data for a centrifugal water pump are shown in Table P14-31 for water at 20°c (Lpm = liters per minute). (a) For each row of data, calculate the pump efficiency (percent). Show all units. (b) Estimate the volume flow rate (Lpm) and net head (m) at the BEP of the pump.(c) Plot the pump's performance data: H, bhp, and pump efficiency as function of volume flow rate. H bhp Lpm) (m) (W) 0.0 47.5 133 6.0 46.2 142 12.0 42.5 153 18.0 36.2 164 24.0 26.2 172 0.0 15.0 174 6.0 0.0 174

Answer 1

ower delivesed by the bh 4 2 6 pur. That is the ligheteoiuf. i, wlich h and H To bhp is glaled

1 Flow rate(lpm)H(m) 2 bhp(W) 133 efficiency(%) bhp scaled(bhp*0.2) 47.5 26.6 46.2 142 31.91704225 28.4 153 12 42.5 54.5 30.6 164 36.2 64.96134146 32.8 26.2 172 34.4 24 59.77255814 15 174 174 42.28448276 34.8 34.8 efficiency net head 12 13 15 16 5 25 35 17 Flow rate(Ipm) 18 19 20 23