Community
Forma Forum
Welcome to the Forma Community. Give feedback, report bugs, and tell us your ideas about Autodesk Forma
cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 

EUI - orientation/shading/overhangs

5 REPLIES 5
Reply
Message 1 of 6
karim_daw
134 Views, 5 Replies

EUI - orientation/shading/overhangs

I am wondering whether someone could indicate to me what exactly is affecting the EUI of the buidling.
I have looked at these two links:
https://help.autodeskforma.com/en/articles/8480701-rapid-energy-analysis-technical-documentation#h_4...
https://help.autodeskforma.com/en/articles/7053939-introduction-to-rapid-energy-analysis

While i understand that the parameters you have indicated, being the construction, compactness, galzing etc. Is there somethign in the model that takes into account the orientation of the building?

5 REPLIES 5
Message 2 of 6
larry.schirmer
in reply to: karim_daw

The rapid energy analysis passes a number of inputs to the energy model. The parameters you mentioned from the article are direct inputs for this model. We also process the geometry from the forma scene into derived features that the model uses to approximate the final result. For each building (or group of buildings if they share a wall or roof), we calculate the orientation, envelope area, roof and floor area, and the building's max height. These derived features and the settings specified in the right menu are passed to the model to generate an approximate EUI for each building. 

 

As for shading and overhangs though, we are looking to provide a more detailed energy analysis in the future which is able to take more detail of a building and it's surroundings into account. Today, the model is not able to process these factors. 

 

If you have anymore questions, I'd love to help.

 

 

Message 3 of 6
karim_daw
in reply to: larry.schirmer

So for my understanding. If you have a rectangular building in forma, the facade orientations are labeled and then used in the ML model? I did not see the explicit orientation labels in the feature list being inputted into the model. Can you confirm whether this is/is not the case

Also this model seems to be only trained on Residential projects correct?

Message 4 of 6
larry.schirmer
in reply to: karim_daw

That's correct. I'll bring this up with the team and see if we can update the documentation to include these details that we pass to the model about the buildings being analyzed. The model takes as input a measure of what percentage of the facade area is facing each direction. And it's also important to point out, as you said, that the current model is trained on the energy usage of multi-unit residential buildings. 

Message 5 of 6
karim_daw
in reply to: karim_daw

Understood. I conducted a test by building a building in Forma and calcualting the EUI. When i rotate it 90 degrees, there is no change to the EUI though..

Message 6 of 6
larry.schirmer
in reply to: karim_daw

I created a generic volume building with 1 floor where the width/height/length are the same and adjusted the settings to the most energy intensive category. The location and elevation of the building along with the other factors mentioned before will make this specific case unique. Just to isolate orientation though, I found rotating this building 45 degrees had a small effect on the estimated energy usage. At 90 degrees, the result was similar to 0 degrees.

 

  Kapture 2023-11-03 at 14.29.58.gif

Can't find what you're looking for? Ask the community or share your knowledge.

Post to forums  

Autodesk Design & Make Report