I also urge you to read this article.
Roof overhangs for passive solar.
Here s a link to a free web based tool to help you size roof overhangs on a passive solar building.
Borst passive solar roof overhang design calculator.
Cost effective passive solar design.
Ben we don t design overhangs primarily for passive solar these days old design rules no longer apply.
There is simulation software like sam to do this.
Of course we don t want to solar shade either unless intentionally.
Interactive online passive solar eaves calculator.
Overhangs are most effective for south facing elements in the northern hemisphere and at midday.
24 dec 2012 02 45 pm.
Generally passive solar design requires overhangs that are sized to fully shade the south facing windows on the summer solstice june 21 and to allow full sunlight to enter on the winter solstice december 21.
Experienced passive solar home designers plan for summer comfort as well as winter heating.
A passive solar house requires careful design and siting which vary by local climate conditions.
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.
Borst engineering construction llc competence integrity and professionalism are integral to all that we do.
We design them primarily to shed water away from the foundation wall depending on wind direction orientation etc.
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.
For instance several features of a window will influence gain of solar heat and shade.
Jonr senior member posts 5341.
User 757117 jul 16 2012 05 54pm 3.
Because the sun travels different paths across the sky in the winter low and summer high time an overhang can be constructed to utilize and manipulate the heat energy.
Work out the right window solar overhang required.
Erik not sure what kind of insolation you receive at your site but it might be worth it to consider the.
You can use the free software sketchup to draw the house and it will draw sun shadows for any date time at your location.
Works worldwide by latitude or address.
How roof overhangs or other window overhangs work to control heat and solar gain.
The size of the window width and height and the window s relationship to the roof the space above the window influences the direct.
In passive solar home design exterior roof overhangs provide a practical method for shading building elements such as windows doors and walls.
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.
