Arch 366: Environmental Building Design SOLAR GEOMETRY

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Arch 366 Environmental Building DesignSOLAR
GEOMETRY

• Winter 2004

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6 main strategy modes for PASSIVE design
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Why Solar Geometry?
Understanding solar geometry is essential in
order to - do passive building design (for
heating and cooling) - orient buildings
properly - understand seasonal changes in the
building and its surroundings - design shading
devices
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The time zone is important as it affects solar
noon. All charts are based on solar noon not the
hour noon. Easiest way to find solar noon for
your location is to note the sunrise and sunset
times (in the paper/net) and solar noon is
halfway inbetween.
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The rotation of the earth about the sun is
affects the amount of solar radiation we receive
at varying times of the year.
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Solar Position
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Solar Position
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Solar Position
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The exact nature of the solar radiation we
receive is a function of our atmosphere.
The Atmosphere
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The Atmosphere
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The precise condition of the sky is taken into
account when determining the amount of solar
radiation that is received by a building. The
clearer the sky, the more energy received.
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The angle the suns rays make with the earths
surface also affects solar radiation levels. When
the angle is oblique, the rays are less intense.
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Part of the reason for the decrease in intensity
is the amount of radiation that is absorbed by
the atmosphere during the longer trip through it
by oblique rays.
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When it is cloudy the rays are diffused and even
less radiation reaches the earths surface.
Shadows are less severe and light is more even.
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Solar Altitude
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Solar Altitude
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Surrounding buildings affect the view from the
site to the sky.
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Sun Path Diagrams
Explanation of sun path diagrams.
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45 degrees N
Equator
North Pole
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Sundials
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...to be continued in "Shading"
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