[Bldg-sim] Building envelope average energy demands

[Giulio Castorina]

Hi All,

thank you all for your quick response. Actually I don't want to 
calculate that value, but just need to cite/reference a source that 
gives information about this data.

I found this http://www.sustainablefacility.com/articles/print/86593 
where a graph is shown...but not really references fully. It says about 
ASHRAE Std 90 - I dont have access to this. Is this a chart inside the 
Do you know if it is inside the ASHRAE standards?

In particular I'm looking at expenditure through external vertical 
walls/windows - hence facades especially in office buildings.

Best

Giulio

Il 26/08/2011 23:06, Goldwasser, David ha scritto:
>
> Maybe not quite what you are looking for, but we have a video 
>  tutorial showing an envelope elimination parametric. In this example 
> we used a full service restaurant but you can do this with any model. 
> The approach is to run a baseline simulation and then to switch all 
> exterior and ground exposed surfaces to an adiabatic boundary 
> condition. Next remove all fenestration surfaces. Then re-run the 
> model. Due to the load driven nature of this project the maximum 
> savings through envelope improvements was just over 3%, but maybe 
> would be 15-20% for an office. Of course it depends where the project 
> is located; the harsher the climate, the more potential savings 
> through envelope improvements. And it depends on the quality of the 
> envelope that you use as a starting point; building activity, and 
> mechanical system efficiency.
>
> Here is a link to the video.
>
> http://www.youtube.com/watch?v=7U91jeksOAw&list=PLF80F250937E2A648&index=38&feature=plpp 
> <http://www.youtube.com/watch?v=7U91jeksOAw&list=PLF80F250937E2A648&index=38&feature=plpp>
>
> And here is a link to COP adjusted end use graphs in Google Documents
>
> https://docs.google.com/spreadsheet/ccc?key=0AhCALIzwiaGPdEI5ZHhaVmpfUHAtdGFDMjg5eW5tT1E&hl=en_US#gid=49 
> <https://docs.google.com/spreadsheet/ccc?key=0AhCALIzwiaGPdEI5ZHhaVmpfUHAtdGFDMjg5eW5tT1E&hl=en_US#gid=49>
>
> This doesn't mean that only 3% of the energy is due to the envelope, 
> but it does show potential savings for retrofits on various elements. 
> You could get more specific and just isolate the roof, or even solar 
> gain from the windows. Or run create an elimination run for plug loads 
> where you set loads to nothing.
>
> David
>
> --
>
> David Goldwasser, LEED AP
>
> National Renewable Energy Laboratory
>
> *From:*bldg-sim-bounces at lists.onebuilding.org 
> [mailto:bldg-sim-bounces at lists.onebuilding.org] *On Behalf Of *John Eurek
> *Sent:* Friday, August 26, 2011 2:36 PM
> *To:* Giulio Castorina; bldg-sim at lists.onebuilding.org
> *Subject:* Re: [Bldg-sim] Building envelope average energy demands
>
> I don't know if this answers your question, but I have tried to 
> determine the % of energy use due to the envelope on a recent building 
> by running multiple energy models.  What I found was the energy 
> balance in complex.
>
> An example is a perfect balance on a cold day
>
> "People" + "Lighting" + "Plug Loads" - "Loss through Wall" = 0
>
> So if the insulation was higher, your loss though the wall would be 
> less and the A/C power usage would be increased.
>
> You could hand calculate the envelope energy demand for an empty 
> unoccupied building, but with internal loads it gets foggy.
>
> The energy model will show you what you can expect from various 
> R-values, but I have not found a way to say x% of energy is due to the 
> envelope.
>
> *From:*Giulio Castorina <artitecture at gmail.com>
> *To:* bldg-sim at lists.onebuilding.org
> *Sent:* Friday, August 26, 2011 2:52 PM
> *Subject:* [Bldg-sim] Building envelope average energy demands
>
> Hi All,
>
> Can anyone advise a good resource (article, webpage, book, etc..) 
> which states what is the average energy demands (construction+running 
> costs) due to Envelopes only in buildings? I would need just a figure 
> in percentage over the whole energy demands of a typical office 
> building. Is this data somehow available?
>
> Best,
>
> Giulio
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