AQUAKOND AKY
CONDENSING BOILER
13
code HC0048.10GB ed.B-1811
AKY
Pipe pressure drop
The table below contains pressure drop values of pipes for flow rate multiple values.
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. 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 below contains the freezing temperatures of water and glycol mixes.
Using a water and glycol mix, it is necessary to increase pressure drops of pipes 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 for AQUAKOND
systems.
Other types of glycol, different from the recommended one, 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
