Solar System Design Guide
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42
Design Information
Snow Load and Wind Load Zones
The collectors and the fixing system must be designed in
such a way that they can withstand any snow and wind
loads that may occur.
Observe the following for installation on pitched roofs:
– If the distance from the top edge of the collector
array to the ridge of the roof is greater than 3.3 ft.
(1 m), we recommend installing a snow guard.
– Never install collectors close to roof overhangs where
snow is likely to slide off. If necessary, install a snow
guard.
Note:
The additional loads due to accumulated snow on
collectors or snow guards must be taken into account
in the structural calculations for the building.
Connect the solar circuit pipework with an electrical
conductor (grounding cable) in the lower part of the
building in accordance with local regulations. The
integration of the collector system into a new or existing
lightning protection facility or the provision of local
earthing must only be carried out by authorized personnel,
who should take the site conditions into account.
Certain parts of the roof are subject to special
requirements. Allow for increased wind turbulence in
these areas:
– Corner area
A
: limited on two sides by the end of the roof
– Edge area
B
: limited on one side by the end of the roof
The width of
A
and
B
should never be less then 3.3 ft.
(1 m) with 6.6 ft. (2 m) preferred. Check with local codes
to verify distance required in your area.
Distance from the Edge of the Roof
Routing Pipe Work
During the design phase, ensure the copper, steel or stainless
steel pipes are installed having a slight slope which descends
from the collector. This ensures better steam expulsion
characteristics in the solar thermal system as a whole in the
event of stagnation. The thermal load exerted on all system
components is reduced (see page 79 and 80).
Equipotential Bonding/Lightning Protection of the Solar Thermal System
