[EnergyPlus_Support] RE: RE: Baseline and Proposed envelope model

[<jeannieboef@xxxxxxxxx>]

check out A3.1.3.2  -  1. a.

depending on density and thickness you can get the fitting Assembly U-value. It is stated that this value includes the air film resistances for internal and external sides. This means you can deturmine the U-value without film coefficients, which lets you calculate the conduction coefficient k of the mass as R=k/L (solve for k). Then create your e+ wall with the said thickness and k, and let e+ worry about applying the correct film values. The correct physics are in place to meet the Standard 90.1 requirements.









---In EnergyPlus_Support@xxxxxxxxxxxxxxx, <bscr_14@...> wrote:

Thanks for the reply,



For above-grade walls, it's a masonry wall (100% brick wall covered with concrete), so I think it qualifies as Mass. Standing in table A3.1A, there is a 'No Framing' row whose input is 'Rated R-Value of Insulation Alone'. As I said, we do not have insulation in our buildings, so I think the R-0 is the right choice. Now, I have three options depending on the density and type of the wall. I don't know which is correct ... In adittion, the three options say they are of 200 mm, however I have walls of different width. Please advice.







> ---In energyplus_support@xxxxxxxxxxxxxxx, <jeannieboef@...> wrote:
> 
> Depends on you wall build...could you describe it? The tables in Appx A include for elements without insulation.
> 
> 
> 
>> ---In EnergyPlus_Support@xxxxxxxxxxxxxxx, <bscr_14@...> wrote:
>> 
>> Two short questions about modeling the envelope:

>> 1. For my proposed model, am I required to follow the tables from appendix A even when my project is outside the US? In Peru, our reality is that there is no insulation for envelope elements of buildings; so what would be my input data for tables A?

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