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<p class=MsoNormal><span style='color:#1F497D'>Christine,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>What result are you looking for
with the natural ventilation – air change rates, sizing of openings?<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=Default><span style='font-family:"Calibri","sans-serif";color:#1F497D'>If
you want air change rates, CONTAM is an airflow simulation tool available at no
charge from NIST <a href="http://www.bfrl.nist.gov/IAQanalysis/">http://www.bfrl.nist.gov/IAQanalysis/</a>.
It performs a multizone analysis of airflow, i.e., each zone is “well-mixed”
and has one temperature, airflow rate, etc. Currently, temperatures are scheduled
inputs. If you want indoor temperatures to be calculated/updated as a result of
natural ventilation, EnergyPlus is available at no charge from DOE <a
href="http://apps1.eere.energy.gov/buildings/energyplus/">http://apps1.eere.energy.gov/buildings/energyplus/</a>.
There is an “Airflow Network” capability that does almost the same things as
CONTAM (use the “MultizoneWithoutDistribution” option). The Airflow Network capability
in EnergyPlus is implemented by a text file whereas CONTAM has a GUI. CONTAM
can output building air change rates for every time step. I believe EnergyPlus
can output an average air change rate for each zone. To get air change rate for
each time, I believe you’d have to calculate it based on available outputs.<o:p></o:p></span></p>
<p class=Default><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=Default><span style='font-family:"Calibri","sans-serif";color:#1F497D'>If
you want to size openings, NIST has another tool, LoopDA also available at no
charge <a href="http://www.bfrl.nist.gov/IAQanalysis/software/LOOPDAdesc.htm">http://www.bfrl.nist.gov/IAQanalysis/software/LOOPDAdesc.htm</a>.
It’s basically solving the “inverse” problem.<o:p></o:p></span></p>
<p class=Default><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=Default><span style='font-family:"Calibri","sans-serif";color:#1F497D'>Lisa<o:p></o:p></span></p>
<p class=Default><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=Default><span style='font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<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";
color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:
"Tahoma","sans-serif";color:windowtext'> McArdle, Mike [mailto:Mike.McAardle@state.vt.us]
<br>
<b>Sent:</b> Friday, April 15, 2011 5:05 PM<br>
<b>To:</b> 'Bruce Easterbrook'; Rimes, Christie<br>
<b>Cc:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Natural Ventilation Only<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>Another method wd be to
manipulate the infiltration values which are based on building pressure
differentials ie wind affected. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Thank you, Sincerely,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Michael J. McArdle , P.E.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Buildings Engineer II, Project
Manager <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>State of Vermont, <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Buildings and General Services
(BGS)<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>2 Governor Aiken Avenue<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Montpelier, Vt. 05633<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Office: 802-828-5650;
cell: 802-272-4828<o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<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";
color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:
"Tahoma","sans-serif";color:windowtext'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Bruce
Easterbrook<br>
<b>Sent:</b> Friday, April 15, 2011 5:02 PM<br>
<b>To:</b> Rimes, Christie<br>
<b>Cc:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Natural Ventilation Only<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:13.5pt'>Building codes and ASHRAE
62.1 which most codes reference requires the outside air to be based on
building square footage and the number of people in the building. See the
app G economizer discussion currently going on. Your design needs to
guarantee your system can deliver the fresh air required and not depend on
whether the wind blows or not. One thing you might investigate would be
to use exhaust fans to meet this minimum flow. Also, some codes allow for
no mechanical ventilation if there is an operable window of a certain size in
the room but this only works for the perimeter of a building. eQuest is
used to model mechanical systems, I'm not sure how well it would work on
passive systems. From what I have read on discussions on this list it
doesn't totally mimic the stack effect either which would probably be critical
in a passive system.<br>
Bruce Easterbrook P.Eng.<br>
Abode Engineering<br>
</span><br>
On 15/04/2011 03:06 PM, Rimes, Christie wrote: <o:p></o:p></p>
<p class=MsoNormal>Hi,<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>I wanted to create a model in eQuest that only had natural
ventilation using the S-G method and no mechanical system. Is this possible?<o:p></o:p></p>
<p class=MsoNormal>I have come up with the following problems:<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in'>I have used a PSZ unit and
have 0 cooling capacity, no ventilation requirements and not installed heating
– however I am still getting cooling and fan energy<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in'>If I turn off the fans
then the unmet load hours are not calculated as they depend on when the fans
are scheduled<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in'>If I use a heating only
system, natural ventilation inputs are not allowed<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in'>I don’t want to just use
an economizer for natural ventilation as I want the outside air to be dependent
on the wind speeds and not forced with fans. <o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>Any thoughts?<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><b><span lang=EN-GB style='font-family:"Arial","sans-serif"'>Christie
Rimes, LEED BD+C</span></b><o:p></o:p></p>
<p class=MsoNormal><b><i><span lang=EN-GB style='font-size:9.0pt;font-family:
"Arial","sans-serif";color:#66737D'>Designer</span></i></b><o:p></o:p></p>
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<pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre>_______________________________________________<o:p></o:p></pre><pre>Equest-users mailing list<o:p></o:p></pre><pre><a
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