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Hi All,<br>
<br>
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. <br>
<br>
I found this <a
href="http://www.sustainablefacility.com/articles/print/86593">http://www.sustainablefacility.com/articles/print/86593</a>
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? <br>
<br>
In particular I'm looking at expenditure through external vertical
walls/windows - hence facades especially in office buildings.<br>
<br>
Best<br>
<br>
Giulio<br>
<br>
Il 26/08/2011 23:06, Goldwasser, David ha scritto:
<blockquote
cite="mid:1B3908614A647745B6A63C7E0E2980D02CCAD391FF@MAILBOX2.nrel.gov"
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<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">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. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">Here is a link to the video.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><a moz-do-not-send="true"
href="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</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">And here is a link to COP adjusted end use graphs
in Google Documents<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><a moz-do-not-send="true"
href="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</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">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.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">David<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">--<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">David Goldwasser, LEED AP<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">National Renewable Energy Laboratory<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><o:p> </o:p></span></p>
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<div>
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medium medium; border-style: solid none none;
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<p class="MsoNormal"><b><span style="font-size: 10pt;
font-family:
"Tahoma","sans-serif";">From:</span></b><span
style="font-size: 10pt; font-family:
"Tahoma","sans-serif";">
<a class="moz-txt-link-abbreviated" href="mailto:bldg-sim-bounces@lists.onebuilding.org">bldg-sim-bounces@lists.onebuilding.org</a>
[<a class="moz-txt-link-freetext" href="mailto:bldg-sim-bounces@lists.onebuilding.org">mailto:bldg-sim-bounces@lists.onebuilding.org</a>] <b>On
Behalf Of </b>John Eurek<br>
<b>Sent:</b> Friday, August 26, 2011 2:36 PM<br>
<b>To:</b> Giulio Castorina;
<a class="moz-txt-link-abbreviated" href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Bldg-sim] Building envelope
average energy demands<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal" style="background: none repeat scroll
0% 0% white;"><span style="color: black;">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.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="background: none repeat scroll
0% 0% white;"><span style="color: black;"> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="background: none repeat scroll
0% 0% white;"><span style="color: black;">An example is
a perfect balance on a cold day <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="background: none repeat scroll
0% 0% white;"><span style="color: black;">"People" +
"Lighting" + "Plug Loads" - "Loss through Wall" = 0<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="background: none repeat scroll
0% 0% white;"><span style="color: black;"> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="background: none repeat scroll
0% 0% white;"><span style="color: black;">So if the
insulation was higher, your loss though the wall would
be less and the A/C power usage would be increased.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="background: none repeat scroll
0% 0% white;"><span style="color: black;"> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="background: none repeat scroll
0% 0% white;"><span style="color: black;">You could hand
calculate the envelope energy demand for an empty
unoccupied building, but with internal loads it gets
foggy.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="background: none repeat scroll
0% 0% white;"><span style="color: black;"> <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="background: none repeat scroll
0% 0% white;"><span style="color: black;">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.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="background: none repeat scroll
0% 0% white;"><span style="color: black;"><o:p> </o:p></span></p>
</div>
<div>
<div>
<p class="MsoNormal" style="margin-bottom: 12pt;
background: none repeat scroll 0% 0% white;"><b><span
style="font-size: 10pt; font-family:
"Arial","sans-serif"; color:
black;">From:</span></b><span style="font-size:
10pt; font-family:
"Arial","sans-serif"; color:
black;"> Giulio Castorina
<a class="moz-txt-link-rfc2396E" href="mailto:artitecture@gmail.com"><artitecture@gmail.com></a><br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><br>
<b>Sent:</b> Friday, August 26, 2011 2:52 PM<br>
<b>Subject:</b> [Bldg-sim] Building envelope average
energy demands<br>
</span><span style="color: black;"><br>
Hi All,<br>
<br>
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?<br>
<br>
Best,<br>
<br>
Giulio<br>
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<o:p></o:p></span></p>
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