I’m currently working on a stadium model in Grasshopper and using Ladybug to calculate solar radiation on the roof. I’ve implemented a parametric model to adjust the roof’s slope and analyze the impact of different roof angles on the amount of solar radiation it receives.
However, I’ve encountered an issue where, in certain cases, the roof appears to receive less solar radiation than the playing field, which doesn’t seem physically accurate. In some instances, the roof receives no radiation at all, even though it is exposed to direct sunlight.
I’ve double-checked the input parameters, but the results still seem off. Has anyone experienced a similar issue where the roof receives unexpectedly low or no solar radiation? Could this be a problem with the analysis settings, the geometry of the roof, or potentially the method I’m using to adjust the roof’s slope?
I’d appreciate any insights or suggestions on how to resolve this!
Hi @mikkel
Thanks for your reply.
I did what you said. Something is changed and I am going to optimize and I will check if there is any zero radiation in some point. Although it looks fixed, I think still there are some incorrect point cause north
Your simmulation looks absolutely fine. Your south facade shows >1300kWh/m2 which is a very large amount for most places on earth. I assume this is Qatar looking at your file, so the results look fine.
Hi @Byron
Thanks for your reply.
I am really new on this thats why I needed someone who is professional to confirm. Your comment was really beneficial for me. After optimisation results, I mean it will try different options, I hope there is no zero sun radiation. I am gonna update this post.
Best regards
I think @mikkel 's answer is still valid. Looks like the normals are facing inside and the radiation you see is what comes through the inside of the stadium.
Please ensure your surface normals are facing outside. The previous results you posted seemed correct.
@Byron Thanks for your interest. As I said, this was my first attempt, Although I did what he said, I think still there were some problem but I handle it right now. I hope I am gonna do optimisation soon and update the post.
Best regards
I flipped the roof loft and when I looked at the sun radiation, the result was still close to zero. However, when I flipped both the roof loft and the facade loft and combined them using Brep Join, the values for the sun radiation appeared normal. I only want to measure the sun radiation for the roof. Where could the problem be?
