Learning Forum

[Zhenming.Peng]

hi all,

i would like to perform a building simulation. the radiation from the sun will be taken into account.

here i have a question about setting the solar irradiation in the setting card.

which direction of the direct irradiation does it mean? i mean it can be horizontal irradiance or tilted irradiance or normal irradiance.

which irradiance does the input of direct irradiance mean?

thanks for the help!

[Karthik Remella]

Hello You should be able to specify the Sun Direction Vector of the sun.
Regarding the definitions of Direct and Diffuse Irradiations, please take a look at the following link.
https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v211/en/flu_ug/flu_ug_Radiation_Model.html?q=solar%20radiation
I hope this helps.
Karthik

[Zhenming.Peng]

Hi Karthik
thanks for the reply.
i know wen can define the sun direction.
but i dont know how ansys defines the direct solar irradiation because if depends on the observed area.
i couldnt open the link, nor login to the custom portal.
Could you please briefly here describe whats their definitions in ansys?
that would help a lot thanks!

[Rob]

This will help with the link /forum/discussion/22563/using-help-with-links

[Zhenming.Peng]

Hi Karthik

i had already read the help documentation before.
there is no clear definition of the direct radiation
it shows:
Illumination Parameters
Direct Solar Irradiation
is the amount of energy per unit area due to direct solar irradiation.
it basically doesnt explain which direct radiation i should use as input (the value of horizontal irradiance, or normal irradiance)
regards