<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div style="RIGHT: auto"><SPAN style="RIGHT: auto">As an engineer reading that article I chuckled thinking "Do they realize 'energy loss' isn't always a bad thing?"</SPAN></div>
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<div style="RIGHT: auto">In your house, most of the time it is a bad thing. In an office building it can be a good thing. I think the answer you are looking for will be difficult to find. If you make a good energy model you can site yourself. And you get something like David <VAR id=yui-ie-cursor></VAR>talked about</div>
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<DIV class=hr style="BORDER-RIGHT: #ccc 1px solid; PADDING-RIGHT: 0px; BORDER-TOP: #ccc 1px solid; PADDING-LEFT: 0px; FONT-SIZE: 0px; PADDING-BOTTOM: 0px; MARGIN: 5px 0px; BORDER-LEFT: #ccc 1px solid; LINE-HEIGHT: 0; PADDING-TOP: 0px; BORDER-BOTTOM: #ccc 1px solid; HEIGHT: 0px" readonly="true" contenteditable="false"></DIV><B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Giulio Castorina <artitecture@gmail.com><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> "Goldwasser, David" <David.Goldwasser@nrel.gov><BR><B><SPAN style="FONT-WEIGHT: bold">Cc:</SPAN></B> John Eurek <redmodeler@yahoo.com>; "bldg-sim@lists.onebuilding.org" <bldg-sim@lists.onebuilding.org><BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Friday, August 26, 2011 4:17 PM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [Bldg-sim] Building envelope average energy demands<BR></FONT><BR>
<DIV id=yiv1649883970>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" target=_blank rel=nofollow>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:
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<div class=yiv1649883970MsoNormal><SPAN style="FONT-SIZE: 11pt; 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. </SPAN></div>
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<div class=yiv1649883970MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: rgb(31,73,125)">Here is a link to the video.</SPAN></div>
<div class=yiv1649883970MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: rgb(31,73,125)"><A href="http://www.youtube.com/watch?v=7U91jeksOAw&list=PLF80F250937E2A648&index=38&feature=plpp" target=_blank rel=nofollow>http://www.youtube.com/watch?v=7U91jeksOAw&list=PLF80F250937E2A648&index=38&feature=plpp</A></SPAN></div>
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<div class=yiv1649883970MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: rgb(31,73,125)">And here is a link to COP adjusted end use graphs in Google Documents</SPAN></div>
<div class=yiv1649883970MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: rgb(31,73,125)"><A href="https://docs.google.com/spreadsheet/ccc?key=0AhCALIzwiaGPdEI5ZHhaVmpfUHAtdGFDMjg5eW5tT1E&hl=en_US#gid=49" target=_blank rel=nofollow>https://docs.google.com/spreadsheet/ccc?key=0AhCALIzwiaGPdEI5ZHhaVmpfUHAtdGFDMjg5eW5tT1E&hl=en_US#gid=49</A></SPAN></div>
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<div class=yiv1649883970MsoNormal><SPAN style="FONT-SIZE: 11pt; 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.</SPAN></div>
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<div class=yiv1649883970MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: rgb(31,73,125)">David</SPAN></div>
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<div class=yiv1649883970MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: rgb(31,73,125)">--</SPAN></div>
<div class=yiv1649883970MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: rgb(31,73,125)">David Goldwasser, LEED AP</SPAN></div>
<div class=yiv1649883970MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: rgb(31,73,125)">National Renewable Energy Laboratory</SPAN></div>
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<div class=yiv1649883970MsoNormal><B><SPAN style="FONT-SIZE: 10pt">From:</SPAN></B><SPAN style="FONT-SIZE: 10pt"> <A class=yiv1649883970moz-txt-link-abbreviated href="mailto:bldg-sim-bounces@lists.onebuilding.org" target=_blank rel=nofollow ymailto="mailto:bldg-sim-bounces@lists.onebuilding.org">bldg-sim-bounces@lists.onebuilding.org</A> [<A class=yiv1649883970moz-txt-link-freetext href="mailto:bldg-sim-bounces@lists.onebuilding.org" target=_blank rel=nofollow ymailto="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=yiv1649883970moz-txt-link-abbreviated href="mailto:bldg-sim@lists.onebuilding.org" target=_blank rel=nofollow ymailto="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</A><BR><B>Subject:</B> Re: [Bldg-sim] Building envelope average energy
demands</SPAN></div></DIV></DIV>
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<div class=yiv1649883970MsoNormal style="BACKGROUND: 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.</SPAN></div></DIV>
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<div class=yiv1649883970MsoNormal style="BACKGROUND: white"><SPAN style="COLOR: black">An example is a perfect balance on a cold day </SPAN></div></DIV>
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<div class=yiv1649883970MsoNormal style="BACKGROUND: white"><SPAN style="COLOR: black">"People" + "Lighting" + "Plug Loads" - "Loss through Wall" = 0</SPAN></div></DIV>
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<div class=yiv1649883970MsoNormal style="BACKGROUND: 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.</SPAN></div></DIV>
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<div class=yiv1649883970MsoNormal style="BACKGROUND: 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.</SPAN></div></DIV>
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<div class=yiv1649883970MsoNormal style="BACKGROUND: 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.</SPAN></div></DIV>
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<div class=yiv1649883970MsoNormal style="BACKGROUND: white; MARGIN-BOTTOM: 12pt"><B><SPAN style="FONT-SIZE: 10pt; COLOR: black">From:</SPAN></B><SPAN style="FONT-SIZE: 10pt; COLOR: black"> Giulio Castorina <A class=yiv1649883970moz-txt-link-rfc2396E href="mailto:artitecture@gmail.com" target=_blank rel=nofollow ymailto="mailto:artitecture@gmail.com"><artitecture@gmail.com></A><BR><B>To:</B> <A class=yiv1649883970moz-txt-link-abbreviated href="mailto:bldg-sim@lists.onebuilding.org" target=_blank rel=nofollow ymailto="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>_______________________________________________<BR>Bldg-sim mailing list<BR><A href="http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org" target=_blank rel=nofollow>http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org</A><BR>To unsubscribe from this mailing list send a blank message to <A href="mailto:BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG" target=_blank rel=nofollow ymailto="mailto:BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG">BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG</A><BR><BR></SPAN></div></DIV></DIV></DIV></DIV></DIV></BLOCKQUOTE><BR></DIV><BR><BR></DIV></DIV></div></body></html>