Fluids

Fluids

Solar boundary condition

    • tungseng99
      Subscriber

      Hi, I have a question about the solar boundary condition while setting the wall boundary conditions. The values of absorptivity of the direct visible and direct IR are the same as the absorption coefficient of the wall materials?

      It would be much appreciated if anyone could help me out with this.

      Thank you in advance:)

    • Karthik R
      Administrator
      Hello Absorptivity is not the same as the absorption coefficient. Please check these links.
      14.3.11. Solar Load Model (ansys.com)
      8.8.1. Absorption Coefficient (ansys.com)
      This should help you understand the difference.
      Karthik
    • tungseng99
      Subscriber
      Hi Karthik Thanks for your reply! Yes, I have read through the links that you attached and now I have a basic understanding of the difference between absorptivity and absorption coefficient. So can I say that the absorptivity under the solar BC is based on the surface finish of the wall?
      Thank you in advance:)

    • Karthik R
      Administrator
      Hi Yes, this is correct! Not just on the finish but also on the material properties of the wall.
      Karthik
    • tungseng99
      Subscriber
      Hi Karthik Alright! Thanks for your help and I really appreciate it.
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