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<p>Ismail,</p>
<p> Type56 assumes that zones have neutral pressure. If you add air
to a zone, it is assumed that the same mass of air leaves the zone
by some means. The same would be true if you were to actively
extract air from the zone; more air would come in to replace the
air that you extracted. The issue, I think, is where the air that
comes into the zone comes from. If it comes from a humid source
then the zone humidity is going to go up. If the air comes from a
dry source then the zone humidity will go down. One of the
challenges with natural ventilation is that if the building is
cooler than the ambient when natural ventilation is activated then
humid air comes into a cool space from outside and the RH in the
space goes way up (cool air can hold less moisture than warm air).
<br>
</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<br>
<div class="moz-cite-prefix">On 07/10/2017 08:43, Issmail OUHALLOU
via TRNSYS-users wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAA779b2O1NZb8NX3S9CZukw9qK78-yz-7oF8=kLD+1fabvi0EQ@mail.gmail.com">
<div dir="ltr"><img class="mailtrack-img" alt=""
src="https://mailtrack.io/trace/mail/4e128a5852e66629b3be71dbca54ce3c3175576b.png?u=633613"
moz-do-not-send="true" height="0" width="0">
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif;color:rgb(0,0,0)">
<div class="gmail_default" style="font-size:12.8px">Dear
colleagues,</div>
<div class="gmail_default" style="font-size:12.8px"><br>
</div>
<div class="gmail_default" style="font-size:12.8px">I am
trying to simulate the impact of natural ventilation by
calculating the mean air velocity entering through the
window (in m/s) according to the equation below:</div>
<div class="gmail_default"
style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:12.8px"><font
face="arial, helvetica, sans-serif" color="#000000"><img
src="cid:part2.4EE7FA73.178871F4@tess-inc.com"
class="gmail-CToWUd" style="margin-right: 0px;"
height="49" width="373"></font><br>
<font face="arial, helvetica, sans-serif" color="#000000">I
got the results as shown in attached files before and
after natural ventilation. The humidity has increased
enormously !</font></div>
<div class="gmail_default"
style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:12.8px"><font
face="arial, helvetica, sans-serif" color="#000000"><br>
</font></div>
<div class="gmail_default"
style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:12.8px"><font
face="arial, helvetica, sans-serif" color="#000000">I
figure out that in TRNBuild the air cannot be extracted
from the zone ! How can I extract the air from a zone
after activating natural or mechanical ventilation ?</font><br>
</div>
<div class="gmail_default"
style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:12.8px"><font
face="arial, helvetica, sans-serif" color="#000000"><br>
</font></div>
<div class="gmail_default"
style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:12.8px"><font
face="arial, helvetica, sans-serif" color="#000000">Does
anyone have experience to deal with such a problem ?</font></div>
<div class="gmail_default"
style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:12.8px"><font
face="arial, helvetica, sans-serif" color="#000000"><br>
</font></div>
<div class="gmail_default"
style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:12.8px"><font
face="arial, helvetica, sans-serif" color="#000000">Thanks
in advance,</font></div>
<div class="gmail_default"
style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:12.8px"><font
face="arial, helvetica, sans-serif" color="#000000">Best</font></div>
<div class="gmail_default"
style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:12.8px"><font
face="arial, helvetica, sans-serif" color="#000000">Ismail</font></div>
</div>
<br clear="all">
<div><br>
</div>
-- <br>
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<div dir="ltr"><i
style="font-size:10.6667px;color:rgb(0,0,0);font-family:Arial,sans-serif">************************************************</i></div>
<div dir="ltr"><i
style="font-size:10.6667px;color:rgb(0,0,0);font-family:Arial,sans-serif">Ismail
OUHALLOU</i><br>
</div>
<div dir="ltr">
<div><font face="Arial,
sans-serif" color="#000000"><span
style="font-size:10.6667px">Green building & Sustainability
consultant</span></font></div>
<div><br>
</div>
<div><font face="Arial,
sans-serif" color="#000000"><span
style="font-size:10.6667px"><b>Morocco</b></span></font></div>
<div><span
style="color:rgb(0,0,0);font-family:Arial,sans-serif;font-size:10.6667px">P:+212<b>
</b>620<b> </b>548<b> </b>116</span></div>
<div><font face="Arial,
sans-serif" color="#000000"><span
style="font-size:10.6667px">F:+212<b> </b>522<b> </b>326<b> </b>440</span></font></div>
<div><a
href="mailto:i.ouhallou@trusted-energy.com"
target="_blank"
moz-do-not-send="true"><font
style="background-color:rgb(238,238,238)" size="1">i.ouhallou@trusted-energy.com</font></a><br>
</div>
<div><a
href="mailto:issmail.ouhallou@gmail.com"
target="_blank"
moz-do-not-send="true"><font
style="background-color:rgb(238,238,238)" size="1">issmail.ouhallou@gmail.com</font></a><br>
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<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
P:+1.608.274.2577
F:+1.608.278.1475
<a class="moz-txt-link-abbreviated" href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>
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