clear sky-calculated indoor illuminance is too lower than that of cloudy sky???

How does ESP-r model the sky and how did you create the sky
for your Radiance scene? A clear sky has a different distribution
than an overcast sky and this could influence the illuminance
in your scene, especially if you're parameters for the ambient
calculation are too low (-ab option as mentioned by Lars).



On 15 Jul 2008, at 09:03, ZZ wrote:

I'm trying to use ESP-r coupling Radiance to perform thermal integrating
daylight use simulation.

That1 day is a very clear sky because that day has a highest
direct and diffuse radiation of those 7days, but the simulated illuminance
with radiance is
much lower than other six days. Anybody can tell why? and how to modifiy?