Learning Forum

[ansys beginner]

Hi,

 

Could someone please provide me of all equations that Solar Ray Tracing Model in ANSYS Fluent uses from the sunray leaves the sun until it reaches the verical surface of a building with solar panels on the façades and rooftop?

 

Regards

[SRP]

Hi,

You can check fluent user's guide: 16.3. Modeling Radiation (ansys.com)

[ansys beginner]

hi,

 

i cannot access to that link. could you provide me the info in other way please?

 

Regards

[Rob]

You want the User's Guide  https://ansyshelp.ansys.com/public/account/secured?returnurl=/Views/Secured/prod_page.html?pn=Fluent&prodver=24.2&lang=en  Or get to it via Help in Fluent. 

[ansys beginner]

are these 3 equations Idirect, I diffuse and I reflected how the solar ray tracing calculate the heat flux on vertical surface? i need to explain it in my master thesis all equations that Ansys fluent resolve to calculate the heat flux on a vertical surface

[Rob]

Heat flux or solar calculator?  The solar calculator works out how much energy is emitted, and at what angle, that's projected onto a face (model dependent) based on the theory in the manuals. If it's not clear in the manual please be specific, if it's not in the manual or Learning then it may be beyond what I can cover on here. 

[ansys beginner]

thanks for your feedback.

 

I mean I select solar ray tracing in SOLAR LOAD MODEL and I click solar calculator and define a set up. once I run the simulation I get W/m2 in the vertical faces of my building. I want to know alll equation that Ansys fluent solves from the moment that a sun ray leaves the sun, passes through the sky/atmosphere and reach the façade to turn into W/m2.

i hope it is clear my doubt

 

Regards Rob

[Rob]

The documentation is here, https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v242/en/flu_ug/flu_ug_sec_radiation.html%23flu_ug_sec_solar_load and the model looks to be based on ASHRAE sources. 

[ansys beginner]

i cannot access to that info due to Ansys Customer Support Space Registration Form

[Rob]

Click on Help in Fluent and then paste the link into the browser. Or look in here https://ansyshelp.ansys.com/public/account/secured?returnurl=/Views/Secured/main_page.html?hl=f  as we've moved most of the documentation into the public side of the system. 

[ansys beginner]

 

i dont get anything but no worrries, leave it.. i dont waste more my time trying to find the equations..  

 

[Rob]

Fluent uses the ASHRAE model, so isn't solving atmospheric effects, it's using the model which also includes effects for time & date to calculate the sun relative angle to the domain. It also doesn't account for shade effects from adjacent buildings. 

[ansys beginner]

Thanks for the reply. What do you mean that doesn't consider atmospheric effect? Don't take into account the effect of clouds, dust particles, aerosols, gases?

[Rob]

The model might, but Fluent is just using the ASHRAE model. Fluent is not calculating anything other than the model: any and all effects are included (or not) in there. 

[ansys beginner]

then, is it the ASHRAE Clear Sky Solar Model?

[Rob]

What did you find in the documentation? 

[ansys beginner]

i did not say anything apologise

[ansys beginner]

hi

 

how can i get this values for other location such as cordoba spain on 1 st July?

 

[Rob]

Day, date and position: ie latitude and longitude in the Solar Model. For the table I would assume there is a reference somewhere. 

[ansys beginner]

i mean about the parameters. where can i get, OET, A, B,C, E0)? i want to make a comparation about manual calculation and ansys fluent results

 

[Rob]

I have no idea. What are they?