|Underside of the Surya Sunbox - in daylight,|
the airgap is quite visible.
When I started this, I imagined big overheating problems in summer, but this never occurred, so the large vents at top and bottom are reducing performance (although if I need access for maintenance, I shall just have to slit the tape.) Unfortunately, for the lower louvres I used 1.6mm aluminium angle, not 3mm, so the louvre has a slight sag.... in the summer, I should replace that section.
|The front aluminium is all one sheet, cut and |
with folded tabs. The side aluminium will be cut
to shape and riveted to this.
I just noticed from this photo that a few pre-existing holes in the aluminium sheet (picked out of a skip!) have holes in the sloping surface, so these will have to be filled in with rivets.
It is amazing what people will throw away. This aluminium is the same grade and quality as what I buy from the engineering stores.