[Bldg-sim] TRNSYS/EnergyPlus questions

[jon hand]

Bryant Walker Smith on the Bldg-sim list asked:
> 2. Are there any building simulation programs/add-ons that incorporate
> daylighting analysis? Alternately, is there any compatability between
> programs like EnergyPlus/TRNSYS and Radiance?

For a number of years ESP-r has supported several approaches to
simultaneous thermal and lighting simulation via Radiance. Esp-r 
includes a module which exports the current thermal model into 
a highly structured Radiance model with full attribution and 
then coerces Radiance modules to accomplish a number of 
lighting/visualisation tasks (external and internal views, 
daylight factors, glare assessments, etc.). 

The module is designed to protect practitioners from the "black hole of 
parameter tweaking" which typifies raw use of Radiance. Expert uses can 
use the module to tweak the parameters and the model description if they 
wish. 

In "simultaneous thermal/lighting assessments" the user can use Radiance 
derived fixed daylight factors within lighting control circuits or the 
simulation engine can call Radiance at each time step to enquire about 
the lux at various points for purposes of control. There is also an 
option pre-calculates daylight coefficients for each external glazing 
which can be useful for high-frequency long-period assessments. 

Additional information is available at <http://www.esru.strath.ac.uk>.

Regards, Jon Hand ESRU

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