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<DIV><SPAN class=479163814-19122006><FONT face=Arial color=#0000ff
size=2>Ramana,</FONT></SPAN></DIV>
<DIV><SPAN class=479163814-19122006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=479163814-19122006><FONT face=Arial color=#0000ff size=2>The
ASHRAE 90.1 ECB sub-committee is working on a methodology for simulating natural
ventilation within the framework of Appendix G but I don't think its finished
yet. In the meantime here is what I would recommend.</FONT></SPAN></DIV>
<DIV><SPAN class=479163814-19122006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=479163814-19122006><FONT face=Arial color=#0000ff
size=2>Appendix G / 90.1 ECB allows you to use an exception
calculation method to simulate hybrid systems or unique efficiency
measures to demonstrate above-standard performance. I think this would
certainly apply in your case. </FONT></SPAN></DIV>
<DIV><SPAN class=479163814-19122006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=479163814-19122006></SPAN><SPAN class=479163814-19122006><FONT
face=Arial color=#0000ff size=2>Here's what I have done on projects requiring an
exception calculation method. </FONT></SPAN></DIV>
<DIV><SPAN class=479163814-19122006><FONT face=Arial color=#0000ff size=2>1.
Establish your energy cost budget and your design energy case
following the Appendix G guidelines. </FONT></SPAN></DIV>
<DIV><SPAN class=479163814-19122006><FONT face=Arial color=#0000ff size=2>2.
Create a second model using the Design Energy Case as the baseline and make the
necessary modifications to simulate radiant heating / no cooling via natural
ventilation. </FONT></SPAN></DIV>
<DIV><SPAN class=479163814-19122006><FONT face=Arial color=#0000ff size=2>3.
Report the energy savings from your exception calculation as a line item at the
end of your LEED EA-1 summary table (similar to how renewable energy is
reported). </FONT></SPAN></DIV>
<DIV><SPAN class=479163814-19122006><FONT face=Arial color=#0000ff size=2>4.
Include a seperate summary table for the exception
calculation showing the energy end-use breakdown and how you arrived at the
cost savings. Show both the baseline and proposed energy use.
</FONT></SPAN></DIV>
<DIV><SPAN class=479163814-19122006><FONT face=Arial color=#0000ff size=2>5.
Make sure the savings are reasonable and prudent for the system you are
proposing. </FONT></SPAN></DIV>
<DIV><SPAN class=479163814-19122006><FONT face=Arial color=#0000ff size=2>6.
Document any changes to the model especially changes to schedules that were
necessary to properly simulate your system. </FONT></SPAN></DIV>
<DIV><SPAN class=479163814-19122006><FONT face=Arial color=#0000ff size=2>7.
Make it easy for someone to review your assumptions and the methodology you
used to estimate the savings</FONT></SPAN></DIV>
<DIV><SPAN class=479163814-19122006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=479163814-19122006><FONT face=Arial color=#0000ff size=2>I hope
this helps. Good luck.</FONT></SPAN></DIV>
<DIV><SPAN class=479163814-19122006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=479163814-19122006><FONT face=Arial color=#0000ff
size=2>Mike</FONT></SPAN></DIV>
<DIV><SPAN class=479163814-19122006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV><!-- Converted from text/rtf format -->
<P><SPAN lang=en-us><FONT face="Swis721 Blk BT" size=2>Michael Tillou,
PE</FONT></SPAN> <BR><SPAN lang=en-us><FONT face="Swis721 Blk BT" size=1>ETC
Group, Inc - Energy Engineering for a Sustainable Future</FONT></SPAN> <BR><SPAN
lang=en-us><FONT face="Swis721 Blk BT" size=1>Ph:413-458-9870</FONT></SPAN> </P>
<BLOCKQUOTE style="MARGIN-RIGHT: 0px">
<DIV></DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><FONT
face=Tahoma size=2>-----Original Message-----<BR><B>From:</B>
bldg-sim@gard.com [mailto:bldg-sim@gard.com] <B>On Behalf Of </B>Ramana
Koti<BR><B>Sent:</B> Monday, December 18, 2006 4:53 PM<BR><B>To:</B>
bldg-sim@gard.com<BR><B>Subject:</B> [bldg-sim] Modeling buildings with
natural ventilation for Appendix G<BR><BR></FONT></DIV>Dear all,<BR><BR>Is
ignoring natural ventilation in both proposed and baseline designs an
accepted/fair way of modeling based on Appendix G (ASHRAE
90.1-2004)?<BR><BR>Part of the proposed design has (radiant heating + natural
ventilation) with no cooling which was modeled as a radiant slab, no cooling,
natural ventilation ignored. <BR><BR>But the Baseline HVAC system based on
Appendix G is System 5: Packaged VAV w/Reheat. (Natural ventilation can be
modeled based on Air Change method or Sherman Grimsrud method though I do not
know how to do it).<BR><BR>I cannot decide how to make the baseline and
proposed comparable with respect to Natural Ventilation (in a manner
acceptable to LEED review), suggestions will be
appreciated.<BR><BR>Thanks,<BR><BR>Ramana Koti, Sustainable Building Analyst
<BR>LEED AP<BR><BR>ELEMENTS | a division of berkebile nelson immenschuh
mcdowell architects<BR>106 W. 14th Street Suite 200<BR>Kansas City, Missouri
64105<BR><BR>p 816.783.1635 f 816.783.1501<BR>www.bnim.com| <A
href="http://elements.bnim.com">elements.bnim.com</A><BR><BR></BLOCKQUOTE><PRE>
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