Help Needed: Determining Uf Value and Heat Flux for Curtain Wall System

[Hicham Boublal]

Hello everyone,

I need some help with a thermal calculation for a facade/curtain wall system.

I am trying to determine the profile thermal transmittance (Uf value) and the heat flux. I have attached the facade section drawing and the glazing technical datasheet in this post.

Could anyone help me determine the Uf value and heat flux, or explain the calculation method used?

 If any additional information is required to perform the calculation, please let me know and I will provide it.  

Any guidance, references, or practical experience would be greatly appreciated.

Thank you in advance!

[Collin Robinson]

Hello ______,

After doing this a few times and receiving no reply, I think there's either a missing will or a missing human on the other end. 

Everything you need to know is spelled out here: https://windows.lbl.gov/documentation-therm

If you have a specific question, ask away. 

[Robin Mitchell]

I think in general this forum is more useful when there has been more progress on a project, ie, a THERM file has been generated and there are issues with how to model something or figuring out what is causing errors in the simulation. 

Asking the group to start from scratch is probably too big a lift for the amazing people on this forum who volunteer their time to help each other. 

You should be able to calculate a U-factor with THERM, so I would suggest that you take a look at the user manual, and possibly the videos. 

https://windows.lbl.gov/documentation-therm

There are also very good THERM instruction videos on the Virginia Tech YouTube Channel:

 https://www.youtube.com/@building-science

There are also a lot more such tutorials on YouTube by various users. 

Robin 

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Robin Mitchell

Windows & Envelope Materials Group
Lawrence Berkeley National Laboratory