Roof Overhangs For Passive Solar

There is simulation software like sam to do this if you want even site phone apps we use it to design solar panels systems.

Roof overhangs for passive solar.

Cost effective passive solar design. An important component of passive solar design is calculating building openings doors and windows and roof overhangs. Design the roof overhangs 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. User 757117 jul 16 2012 05 54pm 3.

Jonr senior member posts 5341. 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. You can use the free software sketchup to draw the house and it will draw sun shadows for any date time at your location.

We don t design overhangs primarily for passive solar these days old design rules no longer apply. 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. In passive solar home design exterior roof overhangs provide a practical method for shading building elements such as windows doors and walls. I also urge you to read this article.

In passive solar home design exterior roof overhangs provide a practical method for shading building elements such as windows doors and walls. Of course we don t want to solar shade either unless intentionally. Erik not sure what kind of insolation you receive at your site but it might be worth it to consider the. 24 dec 2012 02 45 pm.

Overhangs are most effective for south facing elements in the northern hemisphere and at midday. Borst passive solar roof overhang design calculator. How roof overhangs work. 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.

Here s a link to a free web based tool to help you size roof overhangs on a passive solar building. 18 24 is a good rule of thumb i use 24 w a energy heel. We design them primarily to shed water away from the foundation wall depending on wind direction orientation etc.