Daikin UWL030B5 - Water Circulation Pump Selection Principles; Water flow range

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Model Selection Principles for the Water
Circulation Pump
Water ow range
Example for water system volume calculation:
Water ow in the water circulation pump ≥ rated water ow × 1.1
Closed water circulation system: Water circulation pump lift ≥ (Pipe resistance of the water system + Partial
resistance of the water system + Water pressure drop of the unit) × 1.1
Open water circulation system: Water circulation pump lift ≥(Static resistance of the water system + Pipe
resistance of the water system + Partial resistance of the water system + Water pressure drop of the unit) × 1.1
In the case that multiple units share the same pump, the pump lift is calculated according to the circuit that
has the maximum resistance (usually the unit that is farthest away from the pump).
Note: The water ow of the unit should calculate according the water ow range.
The water system is equipped with one UWL030B5 module unit, the set water return temperature is 12°C,
the main water pipe size is DN80, the total length of main water inlet/outlet pipes is 50 m, 10 end fan coils are
normally open, and the internal volumes are all 1.5 L.
Calculation: Volume of main inlet/outlet water pipe =3.14*[(80/2)/1000] 2*50*103=251 L.
Volume of terminal fan coils =10*1.5=15 L.
According to the table above, Vmin.=317 L.
To avoid frequent unit startup/shutdown and alarms, the volume of the water tank should be no less than
Vmin.-V=317-251-15=51 L.
Model
Underground water source Ring water source
UWL030B5 UWL040B5 UWL030B5 UWL040B5
Using
side
Heat
source
side
Using
side
Heat
source
side
Using
side
Heat
source
side
Using
side
Heat
source
side
Flow
range
Max. value
(m
3
/h)
26.39 15.86 33.54 20.15 24.57 30.81 32.37 40.56
Rated value
(m
3
/h)
20.3 12.2 25.8 15.5 18.9 23.7 24.9 31.2
Min. value
(m
3
/h)
14.21 8.54 18.06 10.85 13.23 16.59 17.43 21.84