TECHNICAL PASSPORT INSTALLATION and OPERATION MANUAL
7 - EN
7.
Pressure loss
For the dimensioning of the circulating pump, the following tables which show the pressure drop
against flow of thermal fluid through the collector must be taken under consideration:
Scheme 5. Pressure loss of collectors PK SL AL 2,0 и 2,4
8.
Recommended angle of installation of the collector
The angle of the collector referred to the horizon must be the latitude of the place plus 5°. At this
angle the maximum of the year around efficiency is achieved.
In case of difficulty to follow the above rule, try to keep the inclination between 30° and 50° in order
to benefit a minimum year around efficiency (for places with latitude 40°).
9.
Collector protection against frost
To protect the collector against frost (closed loop) Propylene Glycol PG heat-carrier fluid is
recommended:
Table. 2
PG / Propylene Glycol /: Water
Freezing point
20% : 80%
-
7
℃
30% : 70%
-
13
℃
40% : 60%
-
23
℃
50% : 50%
-
34
℃
If you choose water as heat carrier, it is recommended to connect to the system a controller unit
supporting antifreeze function working with water as heat-carrier.
