Sun Angle Roof Overhang

Do not undervalue their importance.

Sun angle roof overhang. With the window heights and overhangs i used in the model at noon on june 21 the entire glazing of the south elevation windows are completely in shadow but just barely. This will give me complete shade from may to august 24 shading in march 41 in september and less than 10 shading in october. Use the march 21 sun angle and locate the shadow. I used sketchup to help determine how the solar path would fall on the house i am designing.

Borst passive solar roof overhang design calculator. Overhangs are a key part of any home s design. Borst engineering construction llc competence integrity and professionalism are integral to all that we do. Az el both report dark after astronomical twilight.

Jonr senior member posts 5341. 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. Using the calculator i m going to shoot for southern windows that are 4 tall and 2 below the lowest part of a 2 overhang. You can use the free software sketchup to draw the house and it will draw sun shadows for any date time at your location.

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. Use the june 21 sun angle and locate the overhang shadow line at the window sill. At noon on january 21 the glass is completely exposed. From november through februrary the southern windows will receive full sun.

How do i determine the correct amount of shading sun. In short that means that the roof overhang should be of sufficient dimensions to optimize the amount of shade during the warm summer months but not be so large that they do not allow full sun exposure during the cold winter months. Roof overhangs for summer shade and moisture protection. Some shutters eaves trellises light shelves and awnings serve the same purpose as an overhang.

24 dec 2012 02 45 pm. Hot climates above 2 600 cooling degree days base 75 f 22 c. Types of roof or window overhangs for sunlight solar gain control overhangs may be solid louvered vegetation supporting or a combination of all of these aspects. Purpose of use calculating soffit overhang to maximize passive solar house design bug report the time portion is confusing as when i enter 12.

Which should be noon if you are using a 24 hour time the sun angle is shown as negative and i have to go to around 10 pm 2200 hours to get the highest elevation angle. Also the time zones are not explained and one would think could be automatically. Elevation is measured in degrees up from the horizon.