Standard solar power system with pool and heating circuit for SH 7
Compact Top model.
The solar system is used to provide DHW and heating as a priority and,
once this demand has been met, any surplus heat is used to heat the
pool. The solar system heats a hot water cylinder which serves as a
buffer tank. This buffer tank is used to heat the domestic hot water and
simultaneously transfer heat to the heating circuit return. The assigned
relay is connected when the difference in temperature between the
buffer tank and the return is greater than the connection temperature
difference. Also, when the buffer tank reaches the setpoint temperature,
if the collectors sensor S1 is greater than the pool sensor S4, the
second primary pump is activated, thereby using the surplus solar power
to heat the pool.
5.3.4
Pipe diameter calculation
To size the piping, it is recommended that the linear pressure drop of the
pipes does not exceed 40 mmH2O/m and the maximum speed does not
exceed 2 m/s (the design flow rate taken into account is between 30 l/h·m
2
and 60 l/h·m
2
)
Tab.6
Pipe diameter with a 30% glycol concentration at 40 °C
Number of collec
tors
Solar capture sur
face area (m
2
)
Maximum flow rate
(l/h) (50 l/h·m
2
)
Recommended diameter
Nominal diameter
V (m/s)
ΔP (mmH2O/m)
1
2
100
Dia. 10x1.0
0.55
88.5
2
4
200
Dia. 15x1.0
0.42
29.3
4
8
400
Dia. 18x1.0
0.55
36.0
6
12
600
Dia. 22x1.0
0.53
25.2
8
16
800
Dia. 22x1.0
0.71
41.4
10
20
1000
Dia. 28x1.5
0.57
21.2
12
24
1200
Dia. 28x1.5
0.68
29.1
14
28
1400
Dia. 28x1.5
0.79
38.0
5.3.5
Quantity of antifreeze
BAXI heat transfer fluid can be used to fill the installation, in the correct
concentration for the minimum foreseeable outdoor temperature in the
location. It is recommended that you use a mixture of water and glycol in
the following proportions:
Tab.7
Concentration of heat transfer fluid
Volume of heat transfer fluid
26%
33%
37%
Minimum outdoor temperature
-10 °C
-15 °C
-20 °C
Importante
Under no circumstances should the mixture of water and glycol
exceed 40%.
Fig.16
System 5
BA-0000088-01
R1
R3
S2
S3
S4
S1
5 Before installation
18
Solar hydraulic unit
7729335 - 04 - 12052021
