Roof Overhangs For Passive Solar

User 757117 jul 16 2012 05 54pm 3.

Roof overhangs for passive solar. Overhangs are most effective for south facing elements in the northern hemisphere and at midday. There is simulation software like sam to do this. Borst engineering construction llc competence integrity and professionalism are integral to all that we do. In most climates an overhang or other devices such as awnings shutters and trellises will be necessary to block summer solar heat gain.

18 24 is a good rule of thumb i use 24 w a energy heel. Experienced passive solar home designers plan for summer comfort as well as winter heating. Erik not sure what kind of insolation you receive at your site but it might be worth it to consider the. 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. Design the roof overhangs. The size of the window width and height and the window s relationship to the roof the space above the window influences the direct. How roof overhangs or other window overhangs work to control heat and solar gain.

Borst passive solar roof overhang design calculator. I also urge you to read this article. 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. 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.

24 dec 2012 02 45 pm. In passive solar home design exterior roof overhangs provide a practical method for shading building elements such as windows doors and walls. 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. An important component of passive solar design is calculating building openings doors and windows and roof overhangs.

We design them primarily to shed water away from the foundation wall depending on wind direction orientation etc. A passive solar house requires careful design and siting which vary by local climate conditions. Work out the right window solar overhang required. You can use the free software sketchup to draw the house and it will draw sun shadows for any date time at your location.

For instance several features of a window will influence gain of solar heat and shade. Here s a link to a free web based tool to help you size roof overhangs on a passive solar building. 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. Interactive online passive solar eaves calculator.

Cost effective passive solar design.