Roof Overhangs For Passive Solar

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Roof overhangs for passive solar.

18 24 is a good rule of thumb i use 24 w a energy heel. 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. In passive solar home design exterior roof overhangs provide a practical method for shading building elements such as windows doors and walls.

The size of the window width and height and the window s relationship to the roof the space above the window influences the direct and indirect gain of solar heat. Borst passive solar roof overhang design calculator. 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 from the sun. We design them primarily to shed water away from the foundation wall depending on wind direction orientation etc.

We don t design overhangs primarily for passive solar these days old design rules no longer apply. How roof overhangs work. Jonr senior member posts 5341. Erik not sure what kind of insolation you receive at your site but it might be worth it to consider the.

User 757117 jul 16 2012 05 54pm 3. I also urge you to read this article. An important component of passive solar design is calculating building openings doors and windows and roof overhangs. Of course we don t want to solar shade either unless intentionally.

Cost effective passive solar design. Here s a link to a free web based tool to help you size roof overhangs on a passive solar building. Design solar altitude angle for full sun deg from passive solar altitude angle calculator build height of roof overhang from top of glass feet or leave blank build depth of roof overhang from glass feet or leave blank requested solution 0 full shade full sun 1 full shade 2 full sun. You can use the free software sketchup to draw the house and it will draw sun shadows for any date time at your location.

Overhangs are most effective for south facing elements in the northern hemisphere and at midday. How roof overhangs or other window overhangs work to control heat and solar gain overhangs are most effective for south facing elements in the northern hemisphere and at midday. For instance several features of a window will influence gain of solar heat and shade.