[EnergyPlus_Support] Re: why the U-factor changes

["Xing" <xing.shi.2006@xxxxxxxxx>]

Are you trying to model the Baseline case?  According to other replies, the minimum U-value in ASHRAE 90.1 is the U-value of the assembly with surface film.  

I guess you are doing a LEED certified project.  Based on my experience, this is a minor issue and sometimes it depends on what review team gets to review your submittals.  They may or may not care.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, º«ÐÇ <foolishstar@...> wrote:
>
> I built the model in DesignBuilder, and set the exterior wall heat transfer coefficient as 0.479W/m2-K. But after the .idf exported to the EPLUS, the exterior wall U-factor with film showed as 0.484W/m2-K, which cannot meet the ASHRAE standard. I wonder how the value could change. Is it OK not to change the value and submit it the USGBC, or I have to reset the U-factor value in EPLUS?
> 
> 
> Thanks!
> 
> 
> Han Xing
>




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