Pump Performance
Pump Performance
1. Determine the transducer voltage bias average value from the data file. Include the 95%
CI for this value.
95% CI = 2.82*10-5
2. Test Pump 1. See procedure in lab manual. Complet
...
Pump Performance
Pump Performance
1. Determine the transducer voltage bias average value from the data file. Include the 95%
CI for this value.
95% CI = 2.82*10-5
2. Test Pump 1. See procedure in lab manual. Complete Table 1 below using average voltage
readings from data logger and corresponding pressure differential, pump head, and power draw
for each flow rate.
Table 1: Pump 1 measurement results
Flow Rate
(gpm)
Voltage
Reading P (psi) (lbf ????? ft/lbm) ?̇ ????(W)
15 4.23 6.05 13.98 183
12 4.47 6.80 15.7 180
9 4.95 8.30 19.2 172
6 5.17 8.98 20.8 166
0 5.99 11.5 26.7 139
3. Test Pump 2. See procedure in lab manual. Complete Table 2 below using average voltage
readings from data logger and corresponding pressure differential, pump head, and power draw
for each flow rate.
Table 2: Pump 2 measurement results
Flow Rate
(gpm)
Voltage
Reading P (psi) (lbf ft/lbm ????? ) ?̇ ????(W)
15 4.48 6.828125 15.782504 185
12 4.82 7.890625 18.2383628 180
9 5.29 9.359375 21.6332263 168
6 5.54 10.140625 23.4390048 159
0 6.09 11.859375 27.4117175 120
4. Plot H (ft-lbf/lbm) vs. Q (gpm) curves for the Pump 1 and Pump 2 tests on the same graph along
with the manufacturer’s rated values.
For convenience, the manufacturer’s data are seen in Table 3 below:
Vo = 2.295 +/–
Table 3: Manufacturer's Data for Grundfos pumps
GPM 0 2 4 6 8 10 12 14 16 18 20
Head 29.9 28.7 27.1 25 22.9 20.6 18 15.5 12.8 10.4 7.6
Figure 1 Plot showing Head Loss vs. Flow Rate Curves with error bars
5. Compare and discuss these three pump curves.
As seen in Figure 1 above, all three curves follow the same inverse relationship trend, in that
as flow rate increases, head loss decreases. Pumps 1 and pumps 2 both have relatively similar
curves, with an almost identical slope. The manufacturer’s values however appear to have a
much steeper slope. A reason for this could arise from the fact that the manufacturers’ values
have more data points in its curve, thereby making its curve more precise. If there were more
data points for the pumps 1 and 2 curves, those curves could possibly look more similar to the
manufacturer’s curve.
6. Test Pumps 1 and 2 in Series. See procedure in lab manual. Complete Table 4 below using
average voltage readings from data logger and corresponding pressure differential, pump head,
and power draw for each flow rate.
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