Roof Overhangs For Passive Solar

Borst passive solar roof overhang design calculator.

Roof overhangs for passive solar.

Borst engineering construction llc competence integrity and professionalism are integral to all that we do. 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. 24 dec 2012 02 45 pm. 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. 18 24 is a good rule of thumb i use 24 w a energy heel. Erik not sure what kind of insolation you receive at your site but it might be worth it to consider the. Work out the right window solar overhang required.

Of course we don t want to solar shade either unless intentionally. Jonr senior member posts 5341. Experienced passive solar home designers plan for summer comfort as well as winter heating. Ben we don t design overhangs primarily for passive solar these days old design rules no longer apply.

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. A passive solar house requires careful design and siting which vary by local climate conditions. Design the roof overhangs.

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. The size of the window width and height and the window s relationship to the roof the space above the window influences the direct. 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. Here s a link to a free web based tool to help you size roof overhangs on a passive solar building.

Works worldwide by latitude or address. An important component of passive solar design is calculating building openings doors and windows and roof overhangs. 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. You can use the free software sketchup to draw the house and it will draw sun shadows for any date time at your location.

Interactive online passive solar eaves calculator. There is simulation software like sam to do this. In most climates an overhang or other devices such as awnings shutters and trellises will be necessary to block summer solar heat gain. We design them primarily to shed water away from the foundation wall depending on wind direction orientation etc.

How roof overhangs or other window overhangs work to control heat and solar gain.