Good questions, and even better translation tool! i enjoy how almost every engineer out there is a nerd in some way shape or form.<div><br></div><div>The unit started humidifying when i entered 1 cfm of OA into the system. Not sure why, but this is good enough for now.</div>
<div><br></div><div>The coils is over sizing, and altitude is 1.02, and my CFM is set at 18,000, which should be enough for the space. I'm expecting to see coil size of 360 to about 425 kBtu/h, but am ending up with 520 kBtu/h. </div>
<div><br></div><div>The space has 90 kW all year long at 100% during the day and 60% at night.</div><div><br></div><div>Thanks and may the force be with you</div><div><br></div><div>Rob</div><div><br><div><br><div class="gmail_quote">
On Mon, May 23, 2011 at 5:41 PM, Nick Caton <span dir="ltr"><<a href="mailto:ncaton@smithboucher.com">ncaton@smithboucher.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div lang="EN-US" link="blue" vlink="purple">
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Hrmmm... No straight answers, but few questions have I!</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Humidifier isn’t running? With no outside air and
little/no exhaust … seems to me the moisture present at the beginning of
the simulation isn’t ever leaving the space – so why supply more
moisture? The dehumidifier is probably only removing the moisture from
the people also, so I expect it’s not major. You might get
different results if you specify “OA from system” with a corresponding
minimum quantity, if in the real world new, moisture-ridden/barren air is
introduced from other spaces.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">Coil size off? If the simulated design loads do check out
(check reports), keep an eye on the specified/calculated CFM as well.
Note project altitude may mess with you in this regard if you’re
specifying. Also: 90kW*3413/12,000 = about 35.8 tons, so 36 is
probably the floor for what to expect. Also: 90kW is an important
number, but equally important is the schedule… is that running @ 100%
24/7 or for a single hour at a time? You’d end up with different
coil sizes I bet.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">And just for fun… I just found a <a href="http://www.yodaspeak.co.uk/index.php" target="_blank">Yoda-speak translation tool</a>:</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span></p>
<p class="MsoNormal"><i><span style="font-size:11.0pt;color:#1F497D">Coil size off, hmm? If check out (check reports), the
simulated design loads do, as well keep an eye on the specified/calculated
cfm. Specifying, note project altitude may mess with you in this regard
if you are. Also: 90kw*3413/12,000 = about 35.8 tons, so probably
the floor for what to expect, 36 is. Also: An important number,
90kw is, but the schedule, equally important is... For a single hour at a
time is that running at 100% 24/7 or, hmm? End up with different coil
sizes I bet, you would. </span></i></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D">~Nick</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><img border="0" width="119" height="37" src="cid:image001.jpg@01CC1965.2DCBBD20" alt="cid:489575314@22072009-0ABB"></span><b><span style="font-size:11.0pt;color:#2D4D5E"></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;color:#2D4D5E"> </span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;color:#2D4D5E">NICK CATON, E.I.T.</span></b><b><span style="color:#2D4D5E"></span></b></p>
<p class="MsoNormal"><span style="font-size:7.5pt;color:#CC9900">PROJECT ENGINEER</span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#2D4D5E">Smith & Boucher Engineers</span><span style="font-size:7.5pt;color:#CC9900"></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#2D4D5E">25501 west valley parkway</span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#2D4D5E">olathe ks 66061</span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#2D4D5E">direct <a href="tel:913%20344.0036" value="+19133440036" target="_blank">913 344.0036</a></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#2D4D5E">fax <a href="tel:913%20345.0617" value="+19133450617" target="_blank">913 345.0617</a></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"><a href="http://www.smithboucher.com" title="blocked::www.smithboucher.com" target="_blank"><span style="font-size:10.0pt">www.smithboucher.com</span></a></span><u><span style="font-size:10.0pt;color:blue"> </span></u><span style="font-size:11.0pt;color:#1F497D"></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;color:#1F497D"> </span></p>
<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">From:</span></b><span style="font-size:10.0pt">
<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>
[mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Rob
Hudson<br>
<b>Sent:</b> Monday, May 23, 2011 3:21 PM</span></p><div class="im"><br>
<b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
</div><b>Subject:</b> Re: [Equest-users] Humidifier<p></p>
</div><div><div></div><div class="h5">
<p class="MsoNormal"> </p>
<p class="MsoNormal">After more putzing around, i have notices that if you set
the OA to 0 then you cannot humidify, so i set it to 1 cfm, and now it works...</p>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt">Cooling coil is still bothering
me though.</p>
<div>
<p class="MsoNormal">On Mon, May 23, 2011 at 3:30 PM, Rob Hudson <<a href="mailto:rdh4176@gmail.com" target="_blank">rdh4176@gmail.com</a>> wrote:</p>
<p class="MsoNormal">I have an Equipment Rack Room (ERR) that has a chilled
water/hot water single zone system, with de-humidification and humidification.
When i try to model this, i enter in the appropriate inputs into the
system and zone levels, and then for humidification i enter in my design
parameters, 60% and 35% with electric cansister humidifier type. </p>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">My problems begin now, when i run the model the humidifier
is never turning on throughout the year, and dehumidification seems to work
just fine. Also the program is currently sizing my cooling coil to a size
much larger than previously determined by hand. </p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">More notes: the Rack load is 90kW with minimal other
loads (lights and people). 99% sensible heat ratio. Using this i
need about 30 tons of cooling, which translates to a coil that should be
slightly larger than that, due to de/humidification. my thermastat is set
to 72deg and design temperature is also 72 deg.</p>
</div>
<div>
<p class="MsoNormal"> </p>
</div>
<div>
<p class="MsoNormal">This has been alluding me for about 2 hours, so any help is
appreciated.<br clear="all">
<br>
-- <br>
Rob Hudson</p>
</div>
</div>
<p class="MsoNormal"><br>
<br clear="all">
<br>
-- <br>
Rob Hudson</p>
</div>
</div></div></div>
</div>
</blockquote></div><br><br clear="all"><br>-- <br>Rob Hudson<br>
</div></div>