<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">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>
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<div style="RIGHT: auto"><SPAN style="RIGHT: auto">An example is a perfect balance on a cold day </SPAN></div>
<div style="RIGHT: auto"><SPAN style="RIGHT: auto">"People" + "Lighting" + "Plug Loads" - "Loss through Wall" = 0</SPAN></div>
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<div style="RIGHT: auto"><SPAN style="RIGHT: auto">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>
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<div style="RIGHT: auto"><SPAN style="RIGHT: auto">You could hand calculate the envelope energy demand for an empty unoccupied building, but with internal loads it gets foggy.</SPAN></div>
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<div style="RIGHT: auto"><SPAN style="RIGHT: auto">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>
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<DIV class=hr contentEditable=false 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"></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> bldg-sim@lists.onebuilding.org<BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Friday, August 26, 2011 2:52 PM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> [Bldg-sim] Building envelope average energy demands<BR></FONT><BR>Hi All,<BR><BR>Can anyone advise a good resource (article, <SPAN class="" id=misspell-2>webpage</SPAN>, 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>http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org</A><BR>To <SPAN class="" id=misspell-4>unsubscribe</SPAN> from this mailing list send a blank message to <A href="mailto:BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG" ymailto="mailto:BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG">BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG</A><BR><BR><BR></DIV></DIV><VAR id=yui-ie-cursor></VAR></div></body></html>