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RE: [EnergyPlus_Support] Design Builder vs Energy Plus - Maximum U-Value
Josep's approach is good.
If you prefer to use your approach, I do not think there is a hard limit, but
you will probably find that the convection coefficients for the "bridge"
surfaces must be increased or they will become the primary resistance of these
surfaces. Use the ConvectionCoefficients object to set these.
Mike
On 20 Feb 2008 at 9:28, josep.sole@xxxxxxxxxxx wrote:
> In order to introduce the thermal bridges impact I usually use a "small"
> sub-surface in aproximatively at the same position than in the building.
>
>
>
> For the thermal bridging construction I use a very simple; only one layer
> defined by it's R value pre calculated in manner that the thermal transmittance
> resultant is the same considering this construction and it's surface than the
> linear thermal transmittance and it's length.
>
>
>
> I didn't found any problems to calculate in this way due to U (or R) value.
>
>
>
> In my opinion it's not possible to do this approach on DesignBuilder but yes on
> Energy+
>
>
>
>
>
> Josep Solé
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> ________________________________
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> De: EnergyPlus_Support@xxxxxxxxxxxxxxx
> [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] En nombre de André Lopes Enviado el:
> martes, 19 de febrero de 2008 20:08 Para: EnergyPlus Support Asunto:
> [EnergyPlus_Support] Design Builder vs Energy Plus - Maximum U-Value
>
>
>
> Hi
>
> What can be the maximum U-Value that the Design Builder or the Energy Plus can
> calculate? See the attacched picture.
>
> The objective is to put in 1 square meter per Zone the losses due to the Thermal
> Bridges (Linear and Superficial), so in this case the U-value can be 200 or 300
> W/m2.ºK
>
> Regards
>
> A L
>
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx
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