[bldg-sim] Energy-10: Daylight factors don't reflect facade orientation?

[Rob Hitchcock]

Caroline,

Energy-10 daylighting calculation results should definitely be different 
for different orientations within a given building for a given exterior 
daylight availability condition.  I am not sure what "DF%" values you 
are referring to in your message below.  I just did a simple test of 
creating a default square building with identical aperture glazing types 
and sizes on all orientations.  When I scan through the resulting *.FC 
file containing the illuminance values (in footcandles) for each 
lighting zone, for each simulation timestep, I see different illuminance 
levels in each of the lighting zones for each timestep.  Since the 
exterior horizontal illuminance is fixed for a given timestep, and since 
the illuminance levels are calculated by multiplying that exterior 
horizontal illuminance by the Daylight Factor(s) for each lighting zone, 
it follows that the Daylight Factors are indeed different for different 
orientations.

Rob Hitchcock
===========
Caroline Prochazka wrote:

>I am a graduate student of architecture at the
>University of Waterloo. I am using Energy-10, Ecotect
>and Desktop Radiance to study the role of daylighting
>with respect to heating and cooling energy for two
>existing Canadian 'green' buildings. This posting is
>only one of my many questions, which recently arose
>from closer examination of my models.
>
>ENERGY-10: It seems throughout my studies that the DF%
>calculation does not address solar orientation. While
>I can't believe this is so, several tests of square
>buildings with identical north, east, south and west
>walls have shown DF% to be equal on all sides. In the
>Canadian climate, where the sun is predominantly from
>the south, I would assume the North DF% should be
>notable lower than the South DF% with East and West
>being close to equal. Has anyone had a similar
>experience? An Ecotect model confirms my instincts. 
>
>Regards,
>Caroline
>
>=====
>t.    519.822.3832
>e.    cjprocha at yahoo.com
>web:  http://www.geocities.com/cjprocha
>
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