<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">David,</SPAN></div>
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<div style="RIGHT: auto"><SPAN style="RIGHT: auto">I did the same thing with one of my buildings. I made "perfect insulation" which in Trace is simple deleting all the walls. The result was an increase of energy use. Since the internal loads were so high, too much insulation wouldn't allow the heat out. (I compare it to a wrestler running around in plastic trying to cut weight. It may<VAR id=yui-ie-cursor></VAR> be winter, but you get real hot real quick.)</SPAN></div>
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<div style="RIGHT: auto"><SPAN style="RIGHT: auto">So in the case of the super insulation increasing the energy use, what % of the total energy usage can I contribute to the skin load? Would it be a negative percentage?</SPAN></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> "Goldwasser, David" <David.Goldwasser@nrel.gov><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> John Eurek <redmodeler@yahoo.com>; Giulio Castorina <artitecture@gmail.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 4:06 PM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> RE: [Bldg-sim] Building envelope average energy demands<BR></FONT><BR>
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<div class=yiv1794840537MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'sans-serif'">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=yiv1794840537MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'sans-serif'">Here is a link to the video.</SPAN></div>
<div class=yiv1794840537MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'sans-serif'"><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=yiv1794840537MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'sans-serif'">And here is a link to COP adjusted end use graphs in Google Documents</SPAN></div>
<div class=yiv1794840537MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'sans-serif'"><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=yiv1794840537MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'sans-serif'">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=yiv1794840537MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'sans-serif'">David</SPAN></div>
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<div class=yiv1794840537MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'sans-serif'">David Goldwasser, LEED AP</SPAN></div>
<div class=yiv1794840537MsoNormal><SPAN style="FONT-SIZE: 11pt; COLOR: #1f497d; FONT-FAMILY: 'sans-serif'">National Renewable Energy Laboratory</SPAN></div>
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<div class=yiv1794840537MsoNormal><B><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'sans-serif'">From:</SPAN></B><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'sans-serif'"> bldg-sim-bounces@lists.onebuilding.org [mailto:bldg-sim-bounces@lists.onebuilding.org] <B>On Behalf Of </B>John Eurek<BR><B>Sent:</B> Friday, August 26, 2011 2:36 PM<BR><B>To:</B> Giulio Castorina; bldg-sim@lists.onebuilding.org<BR><B>Subject:</B> Re: [Bldg-sim] Building envelope average energy demands</SPAN></div></DIV></DIV>
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<div class=yiv1794840537MsoNormal 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=yiv1794840537MsoNormal 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=yiv1794840537MsoNormal style="BACKGROUND: white"><SPAN style="COLOR: black">"People" + "Lighting" + "Plug Loads" - "Loss through Wall" = 0</SPAN></div></DIV>
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<div class=yiv1794840537MsoNormal 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=yiv1794840537MsoNormal 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=yiv1794840537MsoNormal 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=yiv1794840537MsoNormal style="BACKGROUND: white; MARGIN-BOTTOM: 12pt"><B><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 'sans-serif'">From:</SPAN></B><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 'sans-serif'"> Giulio Castorina <artitecture@gmail.com><BR><B>To:</B> bldg-sim@lists.onebuilding.org<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
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