[Bldg-sim] One model
Rob Guglielmetti
rpg at rumblestrip.org
Wed Mar 11 20:11:45 PDT 2009
On Mar 11, 2009, at 6:09 PM, Ross Harding wrote:
> The ultimate goal for us would be to use one model for daylight and
> energy models, but I haven’t found that quite that simple as most
> software requires varying drawing techniques.
Amen brother! Another issue is that while the energy model has to
include the total building -- all spaces and systems -- to be a
complete picture of the energy use, a Radiance-based daylight model
does not necessarily require all the spaces to be modeled
simultaneously. Indeed, the accuracy of the ambient calculation is
directly affected by the maximum size of the scene, and so conducting
a simultaneous daylight simulation of an entire building at an
acceptably rigorous ambient resolution can be -- is generally -- time-
prohibitive.
As mentioned in a recent thread on this list, Thomas Bleicher's
"su2rad" plugin for SketchUp can export a SU model to Radiance format
and there is also an E+ plugin to allow one to use the same SU model
for E+ analysis; in theory, these three components (SketchUp, su2rad
and the E+ plugin) allow for a "single model" approach to energy and
daylight modeling. However, because the su2rad exporter wants to take
the entire model and create a single Radiance scene description, that
creates the aforementioned problem of the ambient calculation getting
out of hand fairly quickly. I suppose through intelligent layering
and model structuring, one could create a model that could be exported
to Radiance in "space components", but I'm not sure if this is
compatible with the E+ plugin's layering/model organization
requirements.
- Rob Guglielmetti
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