<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
Anne,<br>
<br>
While LEED/ASHRAE 90.1 requires the ventilation rates to be the same
in both the Baseline and Proposed systems, the calculated difference
for the two systems is much higher than expected. Suggest taking
another look at the calculations and confirming that the critical
zone for the VAV system has been properly determined and whether
appropriate factors for the zone air distribution effectiveness (Ez)
and system ventilation efficiency (Ev) have been applied.<br>
<br>
Mark Sorensen<br>
Diversified Energy Services<br>
Fruitport, Michigan<br>
231-578-1264<br>
<br>
On 8/16/2011 9:12 AM, Jim Dirkes wrote:
<blockquote
cite="mid:025201cc5c16$1bbd2bc0$53378340$@buildingperformanceteam.com"
type="cite">
<meta http-equiv="Content-Type" content="text/html;
charset=ISO-8859-1">
<meta name="Generator" content="Microsoft Word 14 (filtered
medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal;
font-family:"Times New Roman","serif";
color:black;
font-weight:normal;
font-style:normal;}
span.EmailStyle18
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
<div class="WordSection1">
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">Dear
Anne,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);">I’m
not sure why you think the OA requirement varies by system.
I’m not well versed in Standard 62, but my basic
understanding is that one of the calculation methods is the
result of building area and number of occupants. Those are
unchanged by system selection … which is why it makes sense
for Appendix G to require matching volumes.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal" style="text-align: center;"
align="center"><b><span style="font-size: 13.5pt; color:
rgb(31, 73, 125);">The Building Performance Team<br>
</span></b><b><span style="color: rgb(31, 73, 125);">James
V. Dirkes II, P.E., BEMP , LEED AP<br>
</span></b><span style="color: rgb(31, 73, 125);">1631
Acacia Drive NW<br>
Grand Rapids, MI 49504<br>
616 450 8653<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span style="color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<div>
<div style="border-right: medium none; border-width: 1pt
medium medium; border-style: solid none none; border-color:
rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color;
padding: 3pt 0in 0in;">
<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>Anne Juran<br>
<b>Sent:</b> Tuesday, August 16, 2011 8:33 AM<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>Subject:</b> [Bldg-sim] DOAS and baseline OA<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size: 12pt; font-family:
"Times New Roman","serif"; color:
black;">I’m curious how everyone is handling the OA for
Appendix G simulations when using a DOAS in the proposed
system. We have a design that is DOAS + FCU with a total
OA of 8,000 CFM. When you run the OA calcs for this same
building with a VAV system (the baseline), the total OA
required to meet Standard 62 is 39,000 CFM. This difference
in OA represents a significant energy savings (in climate
zone 4A), yet Appendix G requires the OA volumes to match.
It does not seem “fair” to me that the proposed case cannot
take credit for design choice when it comes to OA. I feel
like Appendix G should make an exception for DOAS. Am I
missing something? Is there a way around this? Any
thoughts are appreciated!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 12pt; font-family:
"Times New Roman","serif"; color:
black;"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 12pt; font-family:
"Times New Roman","serif"; color:
black;">Anne<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 12pt; font-family:
"Times New Roman","serif"; color:
black;"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 12pt; font-family:
"Times New Roman","serif"; color:
black;"><o:p> </o:p></span></p>
</div>
<pre wrap="">
<fieldset class="mimeAttachmentHeader"></fieldset>
_______________________________________________
Bldg-sim mailing list
<a class="moz-txt-link-freetext" href="http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org</a>
To unsubscribe from this mailing list send a blank message to <a class="moz-txt-link-abbreviated" href="mailto:BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG">BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG</a>
</pre>
</blockquote>
<br>
</body>
</html>