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[EnergyPlus_Support] U-factor floor in contact with ground
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- Subject: [EnergyPlus_Support] U-factor floor in contact with ground
- From: "FrancescoP" <direzionecontraria@xxxxxxxx>
- Date: Fri, 15 Jun 2012 14:25:53 -0000
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- Delivery-date: Fri, 15 Jun 2012 08:25:56 -0600
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In the report EnvelopeSummary I can read also the U-factor for the floor which divides the internal environment from the ground (EXTFLOOR).
I'm wondering how EnergyPlus calculates it.
I think it is
U-factor = 1/Reff
where Reff is defined in EnergyPlus Engineering Reference as the effective thermal resistance in m^2*K/W
If I know the dimensions of the building, the thermal conductivity of the soil, thickness and thermal conductivities of the layers composing the slab-on-grade floor, how can I calculate the U-factor (or Reff or the F-factor)?
I would like to calculate the U-factor (or Reff or the F-factor) before I create the EnergyPlus model in order to compare that value with the limits of ASHRAE 90.1 Table 5.5.
Best Regards
Francesco Passerini
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