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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Dear Sambhav,<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'>There is good information available from ASHRAE which you should
read about DOAS.<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'>A brief understanding is that certain HVAC systems, such as
chilled beams, VRF and water-source heat pumps, are used to remove <u>zone</u>
sensible cooling or heating loads. They are very effective at this
function but do not provide <u>outdoor air ventilation</u> for the zones.
As a result, a separate HVAC system is provided for the express purpose of
providing ventilation air. This is called a Dedicated Outdoor Air System
(DOAS).<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 align=center style='text-align:center'><b><span
style='font-size:13.5pt;color:#1F497D'>The Building Performance Team<br>
</span></b><b><span style='color:#1F497D'>James V. Dirkes II, P.E., LEED AP<br>
</span></b><span style='color:#1F497D'>1631 Acacia Drive NW<br>
Grand Rapids, MI 49504<br>
616 450 8653<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>
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<p class=MsoNormal style='margin-left:.5in'><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"'> bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>sambhav
tiwari<br>
<b>Sent:</b> Saturday, March 27, 2010 12:37 AM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] DOAS system<o:p></o:p></span></p>
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<p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:.5in'>Hi All,<br>
I
would like to know what is DOAS system for what purpose it is used .I have only
heard about it but not used in any of the projects. It wil be so nice if anyone
can tell for what applications it is used.<br>
<br>
Thanks<br>
Sambhav Tiwari.<o:p></o:p></p>
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