Roof Overhang Passive Solar Design

This is a new overhang analysis tool providing visual feedback of the overhang shade at the selected date time as well as an annual performance chart.

Roof overhang passive solar design.

Here s a link to a free web based tool to help you size roof overhangs on a passive solar building. Jonr senior member posts 5341. An overhang or some sort of solar control or solar shading is a crucial element in passive solar design because it blocks the sun s heat energy when it is not desired. Ben we don t design overhangs primarily for passive solar these days old design rules no longer apply.

Explanation of the role of roof overhangs to control solar gain examples of types of roof overhang in northern southern climates solar design handbook questions and answers about using roof overhangs roof overhang angle width height specifications for passive solar heating or cooling questions answers about the use of roof overhangs shading to control. We design them primarily to shed water away from the foundation wall depending on wind direction orientation etc. Cost effective passive solar design. 24 dec 2012 02 45 pm.

There is simulation software like sam to do this. You can use the free software sketchup to draw the house and it will draw sun shadows for any date time at your location. Of course we don t want to solar shade either unless intentionally. Borst passive solar roof overhang design calculator.

User 757117 jul 16 2012 05 54pm 3. I also urge you to read this article. This tool may not work in certain old browsers so in that case you may wish to try a different browser or use the old version feedback is welcome on this new tool and improvements continue to be made. 18 24 is a good rule of thumb i use 24 w a energy heel.