Roof Overhang Passive Solar Design

Overhangs are most effective for south facing elements in the northern hemisphere and at midday.

Roof overhang passive solar design.

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. When sunlight strikes a building the building materials can reflect transmit or absorb the solar radiation. You can use the free software sketchup to draw the house and it will draw sun shadows for any date time at your location. In passive solar home design exterior roof overhangs provide a practical method for shading building elements such as windows doors and walls.

24 dec 2012 02 45 pm. 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. How roof overhangs work. Cost effective passive solar design.

For instance several features of a window will influence gain of solar heat and shade. An important component of passive solar design is calculating building openings doors and windows and roof overhangs. 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.

How roof overhangs or other window overhangs work to control heat and solar gain. 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. Passive solar design refers to the use of the sun s energy for the heating and cooling of living spaces by exposure to the sun.

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. Overhangs are most effective for south facing elements in the northern hemisphere and at midday. Interactive online passive solar eaves calculator.

In addition the heat produced by the sun causes air movement that can be predictable in designed spaces. User 757117 jul 16 2012 05 54pm 3. 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. 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.