Film Coefficient In Window & Film Coefficient In Therm (for a glazing system)

[S_ceng]

Dear Sir/Madam,

 

Hope you are doing good.

 

Regarding therm I have got one query and I hope you will help me out with this, While creating a new boundary condition in therm, what could be the value of film coefficient one should use?

 

Is It ok to use the value which is automatically generated in window module for a particular wind velocity and glass configuration which will be further incorporated into the aluminium profile in therm module or we can directly use 26 w/m2k.?

 

Your prompt response will be greatly appreciated.

 

Thanks,  

 

 

[Robin Mitchell]

In general we recommend importing a glazing system into THERM from WINDOW, and then THERM will automatically use the film coefficients from WINDOW for the glazing system. You might want to look at the NFRC THERM / WINDOW Simulation Manual, which has many rules about how to model glazing systems with frames. 

http://windows.lbl.gov/software/NFRC/SimMan/NFRCSim6.3-2013-07-Manual.pdf

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Robin Mitchell

Windows & Daylighting Group

Lawrence Berkeley National Laboratory

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[Robin Mitchell/LBNL]

[Mark Coulis]

I have read all of the documentation that you cite (and previous publications as well), and cannot find how to adjust the convective film coefficients (Hc) when changing the temperatures.  Example: interior, thermally improved aluminum frame at 75 degrees in lieu of the default 69.8F.  I can change the temperature, but how is the Hc adjusted?

On Monday, February 24, 2014 at 12:02:04 PM UTC-5, Robin Mitchell/LBNL wrote:

In general we recommend importing a glazing system into THERM from WINDOW, and then THERM will automatically use the film coefficients from WINDOW for the glazing system. You might want to look at the NFRC THERM / WINDOW Simulation Manual, which has many rules about how to model glazing systems with frames. 

http://windows.lbl.gov/software/NFRC/SimMan/NFRCSim6.3-2013-07-Manual.pdf

-- 

Robin Mitchell

Windows & Daylighting Group

Lawrence Berkeley National Laboratory

On Mon, Feb 24, 2014 at 1:21 AM, S_ceng <sandym...@gmail.com> wrote:

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