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<p class="MsoNormal">Hi all,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">So, here’s a scenario. Not the first time I’ve had to deal with this but I’d like to know if there’s a better/alternative approach:<o:p></o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo2">A VAVS system serves hundreds of zones. Limited humidity control in this system accomplishes maintaining a minimum of 20% RH in the return airstream.<o:p></o:p></li></ul>
<p class="MsoListParagraph"><img width="307" height="138" style="width:3.1979in;height:1.4375in" id="Picture_x0020_4" src="cid:image004.png@01D38D34.A85BA330"><o:p></o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo2">For a selection (minority) of zones under the large VAVS system, humidity is further controlled to a tighter band of 40-60% by localized electric humidification units (representative
example: <a href="http://www.carnes.com/humidifiers.phtml">http://www.carnes.com/humidifiers.phtml</a>).<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo2">Because the VAVS runs 24/7, supplies mostly OA, and the spaces of concern have relatively light occupancy profiles being the only substantive contributor to moisture in the space,
the RH measured in the field for these select spaces is determined primarily as a function of the air supplied by the VAVS system.
<o:p></o:p></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">How should one go about accurately simulating the energies associated with localized humidification equipment?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I cannot simply add the more stringent humidity range of 40-60 to the central unit – this results in way more humidification and active dehumidification than is actually happening./<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Presently, I’m making a copy of the VAVS, assigning only those critical spaces to the copy, and applying the following system level humidification inputs to the (smaller) copied system only:<o:p></o:p></p>
<p class="MsoNormal"><img border="0" width="312" height="146" style="width:3.25in;height:1.5208in" id="Picture_x0020_3" src="cid:image003.png@01D38D33.D9220410">
<o:p></o:p></p>
<p class="MsoNormal">The main perceived problem with this approach is that the separate SYSTEM will not during the simulation observe the actual RH conditions caused by the larger (actual) VAVS system, which is determined as a combination of effects due to
OA conditions, RA conditions, and active humidification at the central unit. <o:p>
</o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Secondary problems (seemingly easier to address) include:<o:p></o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo2">Ensuring the (smaller) copied system is not over/undersized in airflow/coil capacities<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo2">Introducing the effects of the localized active humidification/dehumidification on the RA stream of the main unit requires transposing “free” latent loads to other zones<o:p></o:p></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">… Is there a better way to skin this cat? Can localized humidification equipment be more explicitly included in our doe2/eQuest simulations? Also interested to learn of any 3<sup>rd</sup> party tools or spreadsheet based calculations
others are used to performing for such situations.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks in advance!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">~Nick<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#3A7A46"><img border="0" width="726" height="9" style="width:7.5625in;height:.0937in" id="Picture_x0020_1" src="cid:image001.png@01D38D31.91BF1790"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#3A7A46">Nick Caton, P.E., BEMP</span></b><span style="color:#3A7A46"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469"> Senior Energy Engineer</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469"> Regional Energy Engineering Manager<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469"> Energy and Sustainability Services</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469"> Schneider Electric</span><span style="color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">D </span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">913.564.6361
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</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">M </span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">785.410.3317
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</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">E </span><span style="color:#1F497D"><a href="mailto:nicholas.caton@schneider-electric.com"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">nicholas.caton@schneider-electric.com</span></a><o:p></o:p></span></p>
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