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[EnergyPlus_Support] Re: U-factor floor in contact with ground
- To: EnergyPlus_Support@xxxxxxxxxxxxxxx
- Subject: [EnergyPlus_Support] Re: U-factor floor in contact with ground
- From: "FrancescoP" <direzionecontraria@xxxxxxxx>
- Date: Fri, 15 Jun 2012 16:39:33 -0000
- Delivered-to: mailing list EnergyPlus_Support@xxxxxxxxxxxxxxx
- Delivery-date: Fri, 15 Jun 2012 10:39:37 -0600
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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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