Solex Roofing Installation Manual 27
Solex Energy Ltd +44(0)1305 837223 www.solexenergy.co.uk
Plumbing Installation – basic system
1.
Expansion tank
– this tank holds a reservoir of water for the system, and provides
space for the water in the solar roof which may drop back into the tank in the event of
an overheat situation when the roof exceeds about 90
o
C, or in the event of a leak
admitting air into the absorber, supply pipe or manifolds.
The expansion tank is sized to the capacity of the system - the Roof Calculator
spreadsheet may be used to calculate the tank size required exactly, however it is
usually approximately as follows:
The tank operates at ambient pressure, and the lid of the tank is vented to the air. The
solar circuit flows through the tank, venting any air in the system as it passes.
Roof area
L
W
H
Kg
up to 8m
2
350 270 370 35
up to 25m
2
600 300 450 80
up to 40m
2
1100 290 460 135
up to 70m
2
1100 290 620 185
up to 85m
2
920 420 630 220
up to 115m
2
1100 320 825 265
up to 200m
2
1250 360 1010 420
