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Solar Pool Heating System -- Installation & User Manual
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Page 27
18.1
PVC Pipe Roof Fixings
19
Array Roof Fixing Configurations
Note the high thermal contraction and natural relaxation of HDPE
: Collectors will contact (in
length) by up to 10mm over time and 12mm thermally across temperature extremes.
Hence
any fixing means must account for an ultimate contraction of 22mm in length per panel.
Key design principles when choosing a roof mounting means:
1)
Consider the high thermal contraction of HDPE
2)
Panels should be as low down on the roof as possible to prevent the wind from
catching the underside of panels
3)
The stainless steel straps must allow for thermal movement of panels.
Note the large thermal movement in the array inlets and outlets
(depending on how panels
you have in one row). PVC pipe work should NOT be fixed to the roof near the inlets and
outlets, but should be allowed to move with the collector array.