What is your assumption to calculate radiation on inclined surfaces?

ahad · June 7, 2019, 7:04pm

hi all
i have some questions about calculating radiation.

sky is isotropic model? … clear sky?
how we can find those equations that was applied for calculating radiation?

minggangyin · June 8, 2019, 4:29am

Hi,@ahad
As I know, there are 3 method for radiation calculate.
1\Ladybuy radiation analysis.
2\Radiance-based radiation analysis.
3\EnergyPlus-based radiation analysis.
So could you me which one is your focus?

ahad · June 8, 2019, 12:54pm

I simulated in canvas of ladybug.

minggangyin · June 9, 2019, 2:17am

Hi,@ahad
Radiation calculation in ladybug is using Gendaymtx exe file.
It is written by Ian Ashdown and Greg Ward. For more information, check the Radiance manual at:
http://www.radiance-online.org/learning/documentation/manual-pages/pdfs/gendaymtx.pdf

ahad · June 9, 2019, 7:09am

Radiance-online.org server is down

minggangyin · June 9, 2019, 9:40am

Hi,@ahad
Here is another reference guide:

chris · June 9, 2019, 6:54pm

I’ll also add that all of the 3 listed methods at the top are anisotropic. Most times, people use the EPW hourly radiation values, which account for cloud cover but it is also possible to do a clear sky radiation simulation as you see here