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<p>Ali,</p>
<p> Types151 and 152 can both heat and cool. In the kind of VAV
that Types151 and 152 model there is a central unit that can
provide heating, cooling and reheat. The terminal units can only
provide heat/reheat. As long as one zone in the whole system
requires cooling then the central unit has to be in cooling mode.
Any zones that require heat will get that heat from their own
terminal unit boxes. All the terminal boxes (except for the one
that needs cooling) will back off as much as they can (to their
minimum air flow rate) and will provide the heat needed. If <i>all</i>
the zones need heat then the central unit's supply air temperature
can move upwards.</p>
<p>regards,</p>
<p> David</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 01/31/2022 15:26, Ali Shahrouzian
via TRNSYS-users wrote:<br>
</div>
<blockquote type="cite"
cite="mid:YTXPR0101MB2112B854221BADBA3CD71A359C259@YTXPR0101MB2112.CANPRD01.PROD.OUTLOOK.COM">
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<p class="MsoNormal">Dear TRNSYS users,<o:p></o:p></p>
<p class="MsoNormal"><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 am going to model a VAV air handler
system to supply the heating load of a residential building
over the course of the winter months. For this purpose, Type
151 and Type 152 components seem most appropriate .<o:p></o:p></p>
<p class="MsoNormal">However, I noticed that they are designed
(in TRNSYS code) in a way that are only suitable for meeting
cooling needs.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I was wondering whether these types (151
and 152) could be used to model a VAV air handler to meet
heating demands as well? How?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best Regards,<o:p></o:p></p>
<p class="MsoNormal">Ali <o:p></o:p></p>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
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<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy System Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI 53703 USA
P:+1.608.274.2577
<a class="moz-txt-link-abbreviated" href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.tess-inc.com">http://www.tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.trnsys.com">http://www.trnsys.com</a></pre>
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