FASTflo LWH56, Руководство по проектированию установки

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Flow Rate Head Loss and Pump Sizing
Fig No.13
The WH and WHX units will operate within a water inlet pressure
range from 1.0 bar to 10.0 bar.
When a pump is used with a storagae system or for secondary
return circulation only bronze or stainless steel pumps must be used.
The pump must be sized to give a minimum flow rate of 8 L/min
through each heater.
The head loss through the FASTflo range of products is due to the
friction generated when the water flows through the heat exchanger
and associated components.
Water Flow (litres/minute)
Head
L
oss
(bar)
0
2.5
2
1.5
1
0.5
0
5 10 15 20 25 30
A suitable 3 speed bronze pump kit with ball valve unions to 28mm cu. can
be supplied by Andrews, part no.B249 (see Fig No. 14)
Pump Selection using multiple heaters (pump required for first unit only)
Number of units Flow rate required Approximate head Speed setting
1 8 l/min - 0.13 l/sec 50 kPa 2
Pump selection using multiple heaters (flow through all units)
2 16 l/min - 0.27 l/sec 50 kPa 2
3 24 l/min - 0.40 l/sec 60 kPa 3
4 32 l/min - 0.53 l/sec 60 kPa 3
5 48 l/min - 0.67 l/sec 60 kPa 3
6 48 l/min - 0.80 l/sec 60 kPa 3