PowerSpout
React Pump Installation
© 2019 EcoInnovation Ltd (NZ) V2.1
Page 29
Peak
Head
L/min
50
15.79
100
15.24
150
14.56
200
13.81
250
13.10
300
12.40
Peak
Peak
Efficiency %
Head
L/min
Efficiency % at peak flow
50
15.79
32
26
100
15.24
47
40
150
14.56
56
50
200
13.81
61
57
250
13.10
65
61
300
12.40
67
64
It is our view that most of our NZ customers will wish to pump in the 50-160m static
head range and so our advice is to install a 1080W PV array with 540W facing East
and 540W facing West.
Maximum flow rate possible at each head
2.2.3.
This maximum (peak) flow of the pump (see right) can be a little misleading
and should not be used to calculate daily water quantities. What is more
useful is the average flow per day over the calendar year as listed in the
previous table.
The peak flow figure is needed (as you will see later) when determining the
size of pipe from the React pump to your header tank.
Our
also publishes these peak flow figures for the same reason (and often little
else). It is easy to measure the maximum flow yourself (in conditions of full sun at right
angles to the solar array) so you can verify from a simple test that all is working correctly. As
you can see, peak flows for the React pump do not fall much with increasing head. This is
because as the head increases more of the solar PV power can be utilized and the pump
efficiency is also higher at higher heads.
Peak pump efficiency
2.2.4.
React pump efficiency increases steadily with
head. Efficiency is best when:
RPM is lower.
Pump is highly loaded.
Incoming solar radiation is not at its peak.
(Peak PV power is more than can be used
whereas morning, afternoon and cloudy
periods provide usable power.)
Solar PV utilisation efficiency
2.2.5.
Solar PV utilisation efficiency is
the power consumed by the React
pump at midday on a clear
summers day divided by the
nominal PV array size in "W
P
".
The table illustrates that the power
available from a smaller PV array
is better utilized. This means that
there comes a point (at midday on
a sunny summers day) where more installed PV will not result in more pumped water. There
is a diminishing return for every extra 540W of PV installed. The implications of this are
discussed in more detail in section 7.
540W
1080W
Peak
Peak
Ulitization eff
Ulitization eff
Head
L/min
Efficiency %
at midday
at midday
50
15.79
32
89
48
100
15.24
47
89
57
150
14.56
56
89
67
200
13.81
61
89
74
250
13.10
65
89
81
300
12.40
67
89
88
