[Equest-users] Humidifier

Rob Hudson rdh4176 at gmail.com
Mon May 23 14:52:05 PDT 2011


Good questions, and even better translation tool!  i enjoy how almost every
engineer out there is a nerd in some way shape or form.

The unit started humidifying when i entered 1 cfm of OA into the system.
 Not sure why, but this is good enough for now.

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.

The space has 90 kW all year long at 100% during the day and 60% at night.

Thanks and may the force be with you

Rob


On Mon, May 23, 2011 at 5:41 PM, Nick Caton <ncaton at smithboucher.com> wrote:

>  Hrmmm...  No straight answers, but few questions have I!
>
>
>
> 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.
>
>
>
> 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.
>
>
>
> And just for fun… I just found a Yoda-speak translation tool<http://www.yodaspeak.co.uk/index.php>
> :
>
>
>
> *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.  *
>
>
>
> ~Nick
>
> [image: cid:489575314 at 22072009-0ABB]**
>
> * *
>
> *NICK CATON, E.I.T.***
>
> PROJECT ENGINEER
>
> Smith & Boucher Engineers
>
> 25501 west valley parkway
>
> olathe ks 66061
>
> direct 913 344.0036
>
> fax 913 345.0617
>
> www.smithboucher.com* *
>
>
>
> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Rob Hudson
> *Sent:* Monday, May 23, 2011 3:21 PM
>
> *To:* equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] Humidifier
>
>
>
> 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...
>
>
>
> Cooling coil is still bothering me though.
>
> On Mon, May 23, 2011 at 3:30 PM, Rob Hudson <rdh4176 at gmail.com> wrote:
>
> 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.
>
>
>
> 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.
>
>
>
> 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.
>
>
>
> This has been alluding me for about 2 hours, so any help is appreciated.
>
> --
> Rob Hudson
>
>
>
>
> --
> Rob Hudson
>



-- 
Rob Hudson
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