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

["FrancescoP" <direzionecontraria@xxxxxxxx>]

In ASHRAE 90.1:2007 I found that in order to estimate the F-factor we can use Table A6.3


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "FrancescoP" <direzionecontraria@...> wrote:
>
> 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) in order to compare that value with the limits of ASHRAE 90.1.
> Best Regards
> Francesco Passerini
>




------------------------------------

Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/join
    (Yahoo! ID required)

<*> To change settings via email:
    EnergyPlus_Support-digest@xxxxxxxxxxxxxxx 
    EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx

<*> To unsubscribe from this group, send an email to:
    EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/