Sun Screens

This is not really a new idea but it seems to have gained more popularity recently what with "green" concerns.  The main problem with nice glass windows is that they let the sun directly into the house and it can get pretty hot.  So what people do is either put in thick curtains, close windows and put on the aircon.  Thats why you go around and see most houses with the upstairs windows closed.  It all seems rather self defeating in a way and I am sure the electricity bills are high.  In addition I dont like constant air con as I feel suffocated by the poor air quality (low in oxygen and high in dust) and also the dryness.

Recent years has seen an upsurge of usage of aluminum sun screens in form of louvered screens shielding walls and windows.  It is effective as it absorbs the direct sun rays and also allows a view from the window (downwards).  In addition, it also allows siting of the air con condenser units.  Many times I have seen well designed houses ruined by that metal block mounted on the wall.  However I dont like aluminum screens and have opted for wooden screens.  Below is a design.  The screen will be hung from the rafters/truss of the roof.  It should have a gap between the wall sufficient for full opening of a window as well as access to installation of an air con condenser unit.

Note from the diagram the effectiveness of the screen from the shadows behind it.

I have included an Illustrator designed screen for those who are interested in more details.  I have put in a horizontal gap of about 2 inch but really its not scientifically designed and I am sure readers can come up with a better design.  The main objectives would be balancing the shielding from the sun and at the same time allowing the house occupants to look outside.  I estimate a 2 inch gap allows horizontal views and a larger downward view.