<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv=Content-Type content="text/html; charset=us-ascii">
<meta name=Generator content="Microsoft Word 12 (filtered medium)">
<!--[if !mso]>
<style>
v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style>
<![endif]-->
<style>
<!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@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:12.0pt;
font-family:"Times New Roman","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;}
p
{mso-style-priority:99;
mso-margin-top-alt:auto;
margin-right:0in;
mso-margin-bottom-alt:auto;
margin-left:0in;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
span.EmailStyle18
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;}
@page Section1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.Section1
{page:Section1;}
-->
</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]-->
</head>
<body lang=EN-US link=blue vlink=purple>
<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Appendix ASHRAE 90.1 2007 Appendix G3.1.3.13 VAV Minimum Flow
Setpoints (System 5 and 7) states:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>“Minimum volume setpoints for VAV reheat boxes shall be
0.4 cfm/sf of floor area served or the minimum ventilation rate, whichever is
larger.”<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>For systems 5 & 7, I will set the minimum flow rate to 0.4 CFM/SF.
If I have high unmet hours due to the small amount of CFM, I will increase the
value on a room by room basis. The baseline’s flow rates are typically
30% less than my proposed model. The fans typically run more often in the
baseline model. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Does anyone else have a different way to model the flow rates
for the LEED Baseline model?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Carol Gardner
[mailto:cmg750@gmail.com] <br>
<b>Sent:</b> Tuesday, September 07, 2010 9:02 PM<br>
<b>To:</b> Kathryn Kerns<br>
<b>Cc:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Confirmation for finding the Baseline Energy
Model Supply Airfllow<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>You must use the 1.15 and 1.25
multipliers to meet LEED requirements. I would look at the throttling range
that eQ is defaulting to. if it's .5 F, which is I think what it is for PSZ, I
would raise that to1 or 2 F, which is reasonable. Then I would look at the
space loads, equipment especially and make sure all that looks good, then I'd
look at the schedules, make sure they are good, and then I'd look at the
cfm/sf. It's not unreasonable to match it to your proposed building and I don't
know of any issue LEED has with doing that.<br>
<br>
Carol<o:p></o:p></p>
<div>
<p class=MsoNormal>On Tue, Sep 7, 2010 at 4:23 PM, Kathryn Kerns <<a
href="mailto:kathryn.kerns@bceengineers.com">kathryn.kerns@bceengineers.com</a>>
wrote:<o:p></o:p></p>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Yes, Carol
I know the default airflow value is very low. Usually the eQuest airflow auto
sizing routine will select larger values than the default. The problem is: what
if the eQuest baseline energy model selects airflows larger than the default
cfm/sqft airflow values but the baseline energy model still ends up with
greater than 300 unmet hours or the baseline energy model has more than 50
unmet hours greater than the proposed energy model? </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Do you
start increasing the baseline energy model airflows above the auto sized
airflow value in the thermal blocks that are having unmet hours issues, or do
you retain the auto sized airflow value and start manually increasing the
baseline heating and cooling capacities that were also auto sized by eQuest
using the 1.15 and 1.25 oversized coefficients?</span><o:p></o:p></p>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'> </span><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><b><span style='font-family:"Arial","sans-serif";
color:black'>Kathryn Kerns</span></b><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><b><span style='font-size:11.0pt;
font-family:"Arial","sans-serif";color:navy'>Systems Specialist</span></b><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><b><span style='font-variant:small-caps;
color:teal'>BCE</span></b><b><span style='font-size:10.0pt;font-variant:small-caps;
color:teal'> </span><span style='font-variant:small-caps;color:teal'>Engineers,
Inc.</span></b><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><b><span style='font-size:9.0pt;
color:black'>| Ph: 253.922.0446 | Fx: 253.922.0896 |</span></b><span
style='font-size:7.0pt;color:black'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'> </span><o:p></o:p></p>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'> </span><o:p></o:p></p>
</div>
<div>
<div class=MsoNormal align=center style='text-align:center'>
<hr size=2 width="100%" align=center>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Carol Gardner
[mailto:<a href="mailto:cmg750@gmail.com" target="_blank">cmg750@gmail.com</a>]
<br>
<b>Sent:</b> Tuesday, September 07, 2010 2:22 PM<br>
<b>To:</b> Kathryn Kerns<o:p></o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'><br>
<b>Cc:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Subject:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Re: [Equest-users]
Confirmation for finding the Baseline Energy Model Supply Airfllow<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'>Kathryn,<o:p></o:p></p>
<div>
<div>
<p class=MsoNormal><br>
<br>
I think that .5 cfm/sf is too low. I never saw it used when I was designing
HVAC systems except for an occasionally used interior space. I immediately
change it to1.0 cfm/sf which I feel is a good place to start. For highly loaded
rooms with lots of internal gain I sometimes up that amount after I have
checked the other possible inputs.<br>
<br>
Carol<o:p></o:p></p>
</div>
</div>
<div>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>On
Tue, Sep 7, 2010 at 1:55 PM, Kathryn Kerns <<a
href="mailto:kathryn.kerns@bceengineers.com" target="_blank">kathryn.kerns@bceengineers.com</a>>
wrote:<o:p></o:p></p>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Everyone, </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'>We are having a
discussion at the office about how to define the supply airflow and energy
model baseline. I pick the baseline system type per Appendix G (packaged single
zone, packaged VAV, etc., set the heating sizing ratio to 1.25 and the cooling
sizing ratio to 1.15, leave the heating and cooling capacities blank so the
model will auto-size, and then set the default airflow to 0.5 cfm/sqft and let
eQuest run. I then check to see if the baseline energy model unmet hours are
less than 300 and are within 50 hours of the proposed model. If the baseline
energy model is above 300 unmet hours or isn’t within 50 hours of the
proposed model, I will then start tweaking the airflow in the baseline energy
model thermal blocks that are causing the unmet hour issues to solve the
problem. </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Is this what everyone
else is doing or do leave the airflow with the default values it calculated
with the 0,5 cfm/sqft limit and enter capacity values in the previously blank
HVAC cooling and heating capacities slots so the baseline energy model stops
auto-sizing? </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Thanks.</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'> </span><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><b><span style='font-family:"Arial","sans-serif";
color:black'>Kathryn Kerns</span></b><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><b><span style='font-size:11.0pt;
font-family:"Arial","sans-serif"'>Systems Specialist</span></b><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><b><span style='font-variant:small-caps;
color:teal'>BCE</span></b><b><span style='font-size:10.0pt;font-variant:small-caps;
color:teal'> </span><span style='font-variant:small-caps;color:teal'>Engineers,
Inc.</span></b><o:p></o:p></p>
<p style='margin:0in;margin-bottom:.0001pt'><b><span style='font-size:9.0pt;
color:black'>| Ph: 253.922.0446 | Fx: 253.922.0896 |</span></b><span
style='font-size:7.0pt;color:black'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:13.5pt;font-family:"Arial","sans-serif";color:black'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
</div>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><br>
_______________________________________________<br>
Equest-users mailing list<br>
<a href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org"
target="_blank">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a><br>
To unsubscribe from this mailing list send a blank message to <a
href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG" target="_blank">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a><o:p></o:p></p>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><br>
<br clear=all>
<br>
-- <br>
Carol Gardner PE<o:p></o:p></p>
</div>
</div>
</div>
</div>
</div>
<p class=MsoNormal><br>
<br clear=all>
<br>
-- <br>
Carol Gardner PE<o:p></o:p></p>
</div>
</body>
</html>
<pre>________________________________________________________________________________________
Fanning/Howey Associates, Inc. intends to send this transmission (including any attachments) only to the
designated individual or entity. If you received this message in error, please notify the sender by replying
to the electronic mail (if electronic) or by telephone at the number indicated on this document.
Fanning/Howey Associates, Inc. has taken reasonable precautions to ensure no viruses are present in the
electronic mail. Fanning/Howey Associates, Inc., will not accept responsibility for any loss or damage arising
from the use of this electronic mail or attachments. Use, disclosure, dissemination, distribution, or reproduction
of this message by unintended recipients is not authorized and maybe unlawful. Any information included in
this transmission that is not related to contracts with our authorization, verbal or written, by Fanning/Howey
Associates, Inc. may not be covered by our professional liability insurance.