Learning Forum

[moranlouie]

I am trying to recreate a study on a Concentrated Solar Power reflector similar to this paper, instead using Direct Ordinates

>> endobj 2 0 obj > endobj 3 0 obj >/Font>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.32 841.92] /Contents 4 0 R/Group>/Tabs/S/StructParents 0>> endobj 4 0 obj > stream x??=k??F?? ???K","url":"https://ankitgujrathiblog.files.wordpress.com/2019/05/analysis-of-parabolic-trough-collector-using-ansys-fluent-software-2.pdf","embedType":"link","name":""}"> https://ankitgujrathiblog.files.wordpress.com/2019/05/analysis-of-parabolic-trough-collector-using-ansys-fluent-software-2.pdf

[Karthik Remella]

Hi,nYou can set up the absorptivity and scattering coefficient under the material properties. Internal emissivity can be set under the Boundary Conditions settings. You can set up the reflectivity also from the boundary conditions panel. You might want to look at the 'Diffuse Fraction' for setting transmittivity and reflectivity on semi transparent wall.nPlease check this link.nThanks.nKarthikn

[moranlouie]

Hello, again, Karthik,nI have a problem with the settings: the absorptivity given in the two studies I found are unitless, exactly 0.9. While the input Ansys asks for is in the reciprocal of a unit length. How do I make the conversion?nThanksn

[Rob]

That'll depend on how the study did the calculation: we're not going to try and second guess a paper I've not seen (and don't post it on here!). n

[DrAmine]

Hello, again, Karthik,I have a problem with the settings: the absorptivity given in the two studies I found are unitless, exactly 0.9. While the input Ansys asks for is in the reciprocal of a unit length. How do I make the conversion?Thanks/forum/discussion/comment/99256#Comment_99256

Might Be related to emissivity of surface as absorption equals emission after Kirchhoff.n