re: design spreadsheet for a solar pergola? SOLAR.KnowledgePublications.com

re: design spreadsheet for a solar pergola?
31 oct 2005
>...this would have more summer shading and winter concentration:
>
>.   .   .   p        
>.   .   .       o
>    .               l
>  2'.<- polycarb        y       dynaglas
>    .   .   .   .   .   .   c               
>    .  foil-faced foam  .       a       greenhouse
>                    .               r              
>                    .                   b       roofing
>                    .   .   .   .   .   .   o       
>                    .   .   .   .   .  al       n
>                                 1x3.               a
>                    | d |           .                   t
>                                    .1x3.   .   .   .   .   e
>                                    .   .   .   .   .   .   
>                                        |       l       |
>
>tan(73.5) = 2/(d/2) makes d = 1.18', and tan(26.5) = 2/l makes l = 4.01'.

scaling so d+l = 4' makes d = 0.91' with a 1.54' vs 2' tall inner glazing.

the foamboard might screw onto notched flats in parallel rafters above
and below it, with an aluminum cap strip above and 1x3s below and
clear flat 0.020" polycarbonate screwed to the 1x3 edges. 

nick