Had a tutorial with Joel Carter of the MEng course on Monday, and evolved the design further - we had a thorough discussion of the benefits of putting a glassy screen in front of the panels to foster a microclimate that would increase the air temperature around the panels - a sort of Trombe wall effect.
So in the evening, i have researched the stock sizes of Polycarbonate sheet and worked out the optimum sizes for a sort of glass box that can surround the panels - if I leave it till another year, we would need the cost of scaffolding again, so it's worth doing all in one go.
There is an interesting discussion between me and David Brook just below this posting, discussing the idea of glassing in only one of the pairs of panels, to compare their performance.
In the image above, the South Wall panels are rendered in ArchiCAD and photoshopped onto a photo of the house and PV roof. So we are hoping to capitalise on the 'Greenhouse Effect'.
Postscript Dec 10th: I have now ordered the Polycarbonate, more than 400 quids worth!! enough to make two large boxes, as above, and it will now be very closed, eg there will even be a Polycarbonate soffit going in, to make the air inside very hot. The outer leaf of the brick wall will get hot in Summer, which will prolong the thermal benefit long after sunset.