Apricus Installation Manual
10
Pump Sizing
Sizing of the Solar Pump
The standard CoolSky Twin Line Pumping
station is supplied with a 3-Speed WILO ST
15/6 Eco Pump (6m head) as standard. This
is suitable for most domestic installations
with the pump speed selected to suit the
pressure drop of the piping. Speed 1 is
generally suitable for a short pipe run, such
as on a single-storey house. Speed 3 can
normally service a 3-storey, 90 collector
pressurized system.
If the pipe run is very long or there are more
than 90 tubes in the collector array, a larger
pump may be needed. For these installations
CoolSky supply a Twin Line Pumping station
with a 3-Speed WILO ST 15/8 High Head
Pump (8m head).
If multiple banks of collectors are installed in
parallel, the head loss should be calculated
based on the longest pipe run through a
single bank of collectors and, then, the
pump can be sized to meet the total flow
rate requirements.
Please Note that Drain-back Systems will
typically require a larger rated pump.
Flow Meter
The CoolSky Pumping Staions include a flow
meter as standard to ensure that flow rates
are at suitable levels and can be monitored.
The flow meter includes a restrictor valve
allowing the flow to be adjusted accordingly.
Flow Rate
A suitable flow rate range for each 30 tube
collector is in the range of 1.5 to 3.0 litres
per minute.
Cool Tip
Set the Flow Rate through the
collector array to :
0.1 litre / minute / tube
That is :
1 litre / minute for 10-tubes
2 litres / minute for 20-tubes
3 litres / minute for 30-tubes
