Sun Angle Roof Overhang

Purpose of use calculating soffit overhang to maximize passive solar house design bug report the time portion is confusing as when i enter 12.

Sun angle roof overhang.

Use the march 21 sun angle and locate the shadow. Borst engineering construction llc competence integrity and professionalism are integral to all that we do. You can use the free software sketchup to draw the house and it will draw sun shadows for any date time at your location. 24 dec 2012 02 45 pm.

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. This will give me complete shade from may to august 24 shading in march 41 in september and less than 10 shading in october. 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. From november through februrary the southern windows will receive full sun.

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. How do i determine the correct amount of shading sun. At noon on january 21 the glass is completely exposed. Roof overhangs for summer shade and moisture protection.

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. Jonr senior member posts 5341. Borst passive solar roof overhang design calculator. Also the time zones are not explained and one would think could be automatically.

Azimuth is measured in degrees clockwise from north. 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. 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. For example if the roof s overhang does not shade the window during the hottest hours of the day direct and reflected sun light will heat the interior.

I used sketchup to help determine how the solar path would fall on the house i am designing. Hot climates above 2 600 cooling degree days base 75 f 22 c. Some shutters eaves trellises light shelves and awnings serve the same purpose as an overhang. Az el both report dark after astronomical twilight.

Overhangs are a key part of any home s design. Elevation is measured in degrees up from the horizon. Use the june 21 sun angle and locate the overhang shadow line at the window sill.