Roof Thickness or U value for sf_urban_physics = 3

[hamzanisar470]

I wanted to know U value of roof or thickness of roof when using sf_urban_physics = 3. and how we can change it

 

[Ming Chen]

Would you please clarify your question? By saying U value of roof, do you mean U at roof height?

 

[hamzanisar470]

Would you please clarify your question? By saying U value of roof, do you mean U at roof height?

By U value I mean thermal transmittance and number of layers of roof.

 

[Ming Chen]

Thank you for the clarification. I will talk to our expert and get back to you.

 

[cenlinhe]

These model parameters can be changed based on your local urban observations or optimized to match with other observation data. Current default model setup for number of roof level is arbitrary which was used in previous studies. The thermal transmittance is also from previous studies which may not be applicable in all the cities. So you can change those values.