Hi,

Is there a way to simulate direct sunlight in Diva to get (the percent of time occupied when direct sunlight is experienced)? I've seen something similar in a paper and was wondering if it can be done in Diva. The paper I'm referring to is: (page 3411).

Jakubiec, Alstan, and Christoph Reinhart. 2013. “PREDICTING VISUAL COMFORT CONDITIONS IN A LARGE DAYLIT SPACE BASED ON LONG-TERM OCCUPANT EVALUATIONS: A FIELD STUDY.” In Proceedings of BS2013, 13th Conference of International Building Performance Simulation Association, 3408–15. http://www.ibpsa.org/proceedings/BS2013/p_1034.pdf.

Thanks,

Belal

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Hello Belal,

We did it a little differently in the paper, but you can get pretty similar results by (1) running an grid annual climate-based simulation of Daylight Autonomy (DA); (2) Set the lighting threshold to 1000 lx; (3) Set the number of ambient bounces to 0 such that the relevant portion of the Radiance Parameters line reads -ab 0

This will calculate only direct light which is over 1000 lx at each sensor and return a value in percentage of occupied hours from 0 to 100.

Best regards,

Alstan

Thank you Alstan. That was helpful!

Belal

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