23
code HC0100.00GB ed.A-1509
HY
AQUAPUMP HYBRID
HYBRID HEATER
Pipe pressure drop
The table below contains pressure drop values of pipes for flow rate multiple values of fan heaters.
The drop is indicated in kPa per 1 metre of linear length; the calculation must be made by calculating the equivalent length of the
pipe. The distance of the fan heater from the boiler must be duplicated. Drops are given for glycol-free 70-75°C water; for water
glycol mix, multiply the drops by the given factor. The last line contains the volume in litres per 1 metre of pipe.
Pressure drops identified due to the various components inserted in the hydraulic system must be added up to the pipe length,
according to the values indicated in the table below.
Glycol coefficients
The table just above contains the freezing temperatures of water and glycol mixes.
Using a water and glycol mix, it is necessary to increase pressure drops of pipes and fan heaters according to the following
coefficients:
•
for a glycol mix equal to
10%
of volume multiply by
1.07
•
for a glycol mix equal to
20%
of volume multiply by
1.15
•
for a glycol mix equal to
30%
of volume multiply by
1.22
All data refer to a FERNOX ALPHI11 monopropylene glycol and water mix recommended by APEN GROUP
Other types of glycol, different from the recommended one, may invalidate the product warranty.
Pressure drops in kPa for 1 metre of linear length
Water flow rate
Steel pipes
Copper pipes
l/h
3/4"
1"
1"1/4
1"1/2
2"
20/22
25/28
32/35
39/42
51/54
600
0.15
0.05
0.18
0.06
0.02
900
0.31
0.10
0.03
0.35
0.12
0.04
1,200
0.55
0.18
0.05
0.02
0.60
0.20
0.07
0.03
1,500
0.82
0.26
0.07
0.03
0.30
0.10
0.04
1,800
0.36
0.10
0.04
0.01
0.42
0.13
0.05
0.01
2,100
0.49
0.13
0.06
0.02
0.52
0.17
0.07
0.02
2,400
0.65
0.16
0.08
0.03
0.70
0.21
0.09
0.03
3,000
0.24
0.11
0.04
0.27
0.12
0.04
3,600
0.34
0.16
0.06
0.35
0.17
0.06
4,200
0.45
0.21
0.07
0.53
0.22
0.07
4,800
0.59
0.21
0.08
0.28
0.08
Water content l/m
0.37
0.59
1.20
1.39
2.22
0.31
0.49
0.80
1.19
2.04
Equivalent
length in m
Steel pipes
3/4"
1"
1"1/4
1"1/2
2"
45° bend
0.3
0.3
0.6
0.6
0.6
90° bend
0.6
0.6
0.9
1.2
1.5
90° bend with wide radius
0.6
0.6
0.6
0.6
0.9
T-shaped fitting
1.5
1.5
1.8
2.4
3.0
check valve
1.5
1.5
2.1
2.7
3.3
gate valve
0.3
0.3
0.3
0.3
0.3
Table of freezing temperatures
Glycol %
25
30
35
40
Freezing temperature
-11°C
-15°C
-18°C
-22°C
WARNING: check that the minimum water content of pipes for the system is 35 litre for model HY434 and 45
litres for model HY534. If this is not the case, provide for pipes with greater diameter or equip the system
with a reservoir having suitable volume.
Summary of Contents for Aermax Series
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