Miscellaneous
The solar panel must be designed as a closed system,
because the inhibitors in the antifreeze are quickly con-
sumed by penetrating atmospheric oxygen.
The system must not be equipped with a galvanised heat
exchanger, heat accumulators, tanks or pipes, because
zinc can be replaced by 1,2-propylene glycol.
It is important that all sealing and binding materials are
heat tolerant to the maximum stagnation temperature
that can occur in the solar power system.
No external electrical potentials may occur between the
components in the system that are in contact with the
anti-freeze. On the other hand a limited external potential
(around 1.5 volt) can occur in copper system components.
The system and its components must be protected against
penetrating dirt and water during installation and before
filling.
Starting
Fill in the commissioning protocol on page 67 in conjunc-
tion with commissioning.
Insulation
The pipes must be insulated to minimise heat losses.
Insulate the pipes according to national norms and prac-
tice.
A very high heat tolerance must be guaranteed for pipes
and pipe insulation in the solar circuit, because temperat-
ures of up to 200 C can occur in the circuit. Appropriate
insulation must therefore be used in the solar circuit.
Pressure drop diagram
Pressure drop diagram for water:
Pressure loss
in mbar
0
20
40
60
80
100
120
140
160
180
0
20
40
60
80
100
120
140
160
180
Flow rate
in kg/h
3UHVVXUH
GURS LQ
PEDU
)ORZ LQ
NJK
With glycol mix heating medium the relevant correction
parameters must be observed.
If Tyforop L is used with 44 % glycol, the following
pressure drop curve applies:
Pressure loss
in mbar
0
20
40
60
80
100
120
140
160
180
200
0
20
40
60
80
100
120
140
160
180
Flowrate
in kg/h
3UHVVXUH
GURS LQ
PEDU
)ORZ LQ
NJK
Pipe connection option
In general, the connection of the individual rows in larger
solar heating systems should be according to the Tichel-
mann principle. With several rows, the return connection
between the junction and solar panel must be equipped
with a ball valve or adjustment valve with high heat toler-
ance. This must be insulated after commissioning. But it
must be marked to show that there is a possible shut off
valve under the insulation! This is in order to be able to
vent row by row and to adjust the flow if necessary.
NOTE
The solar panel’s safety valve must never be able
to be switched off from the solar panel.
Recommended flow:
Min flow: 0.35 minute litres / m
2
Max flow: 0.75 minute litres / m
2
Parallel two sided connection of vertical solar
panels
Advance
Return
6XSSO\
5HWXUQ
Parallel single sided connection of vertical solar
panels
Return
Advance
6XSSO\
5HWXUQ
SOLAR FP215 P/PL
Chapter 3 |
Installation
10
