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[EnergyPlus_Support] Re: U-factor floor in contact with ground



Thank you Jason, but I think that what you posted is useful if one knows the F-factor value and he wants EnergyPlus to use that value. I  would like to calculate the F-factor of the proposed building (as designed) before I create the model in EnergyPlus, in order to check in the design phase how good the level of insulation is in comparison with the requirements of ASHRAE 90.1.
Best Regards


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Jason Kirkpatrick <jason.alan.kirkpatrick@...> wrote:
>
> I suggest you use the object provided for incorporating F-Factor
> 
> Construction:FfactorGroundFloor,
>     ExteriorSlab_PerimeterW, !- Name
>     1.264,                               !- F-Factor {W/m-K}
>     =$ZoneArea,                    !- Area {m2}
>     =$PerimeterDistance;       !- PerimeterExposed {m}
> 
> Be sure to use the F-Factor for the unheated slab on grade floors (required
> in 90.1-2007 App. G3.1.5.b
> "? Slab-on-grade floors shall match the F-factor for unheated slabs from
> the same tables."
> 
> Look in the Engineering Reference for details about how SOG F-Factors are
> calculated, pp 131
>




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