Netafim COOLNET PRO, Handbook

Page: 30 / 48

30 UPSIDE-DOWN MICRO-EMITTERS HANDBOOK
MICRO-SPRINKLERS/EMITTERS ASSORTMENT
Performance
Nozzle
Nozzle
size
(mm)
Constant
K*
Exponent
X*
040 0.60 8.6 0.45
050 0.71 9.5 0.47
Wetted diameter
*Wetted diameter at 1.5 meter height above
surface and 3.0 bar working pressure.
At least 0.5 mm/h
*The constant K and exponent X enable real flow
rate calculations at different working pressures
using the formula:
Q (l/h) = K*(P(meter)^X) .
Flow rate calculation
Nozzle Wetted diameter (meter)*
040 4.0
050 4.0
Water trajectory
T
D
Nozzle
T. Trajectory
height (cm)
D. Distance from
head (cm)
040 10 75
050 22 100
Trajectory height at distance from emitter head
Pressure: 2.5 bar
Distribution uniformity at different spacings - rectangular pattern
Spacing (m x m) › 1.0 x 1.0 1.0 x 1.5 1.0 x 2.0 1.5 x 2.0 2.0 x 2.0
Nozzle Real flow rate* Precipitation rate (mm/h)
040 40.0 40.0 26.7 20.0 13.3 10.0
050 47.0 47.0 31.3 23.5 15.7 11.8
*Distribution uniformity tests under laboratory conditions,
emitter head at 1.5 meter above surface. Real flow rate
at 3.0 bar working pressure at the emitter head.
The layouts, distances, working pressures and heights-
above-surface presented in the tables above are solely for
demonstration purposes. There are countless additional
configurations for micro-emitter placement.
To acquire accurate distribution data for a specific crop, contact the pertinent Netafim™ technical team.
Head loss
Head loss (bar) in the emitter stand micro-tube and AD valve
Nozzle › 040 050
Micro-tube
length (cm)
Head loss (bar)
Micro-
tube
AD
valve
Complete
unit
Micro-
tube
AD
valve
Complete
unit
15 0.006 0.04 0.05 0.009 0.05 0.06
30 0.012 0.04 0.05 0.017 0.05 0.07
60 0.024 0.04 0.06 0.035 0.05 0.08
90 0.035 0.04 0.08 0.052 0.05 0.10
120 0.047 0.04 0.09 0.070 0.05 0.12
*For germination the CU/DU quality rankings
are higher than for other applications as
germination requires supreme uniformity.
%CU* ≥ 97% ≥ 94% and < 97% < 94%
Legend