Article 61583 of alt.solar.photovoltaic:
Path: news.misty.com!not-for-mail
From: nicksanspam@ece.villanova.edu
Newsgroups: alt.solar.photovoltaic,alt.solar.thermal
Subject: Re: What color house?
Date: 28 May 2008 12:22:20 -0400
Organization: Villanova University
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mike  <spamme9@gmail.com> wrote:

>Don't remember all the details, but some kid won the national science 
>fair prize for a roof that looked like a stairway.
>Black on the vertical surfaces and white on the horizontal surfaces.
>Average reflectivity went down as the sun moved south for the winter.

PE Norman Saunders patented "solar staircase" has mirrors for treads
and transparent risers...

But shading based on detailed summer sun angles isn't as effective as
80% vertical shadecloth over the outside of a window, since a lot of
summer sun is diffuse, eg 65% on a south wall in Austin in August.

Nick