[Equest-users] Active Chilled Beam/Fan Coil System

[Carol Gardner]

Greg,

Three questions. Have you talked to Mitch in your Portland office? He's a
great resource but I don't know how things are at Glumac right now. Are
running your OA through a HRV, and lastly is your OA constant volume or are
you varying it?

Carol

On Fri, Apr 9, 2010 at 1:32 PM, Greg Collins <GCollins at glumac.com> wrote:

>  I have tried it, but I end up getting an error saying the leaving air
> temp off the coil needs to be at least 6F higher than the entering water
> temp to the coil, and for some reason I don’t get the same error for the
> FCU.  In an active chilled beam, the coil is actually just cooling the room
> induction air, then mixing it with the primary air from the DOAS.  I think
> that equest assumes the air mixes before entering the coil, which
> fundamentally is the same thing, but the numbers trip this error message.
>  I’ll look into more why the FC system doesn’t make that happen, but the two
> seem to be essentially the same system except for the fan (which I make
> 0.000001 kW/cfm anyway).
>
>
>
> *From:* Grando, John [mailto:JGrando at cosentini.com]
> *Sent:* Friday, April 09, 2010 1:00 PM
> *To:* Greg Collins; Bruce Easterbrook
>
> *Cc:* equest-users at lists.onebuilding.org
> *Subject:* RE: [Equest-users] Active Chilled Beam/Fan Coil System
>
>
>
> Have you looked into SYSTEM TYPE = IU (Induction Unit).  This may be a
> better path to try.
>
>
>
>
> *John Grando** **LEED AP**| **Mechanical Engineer
> *
>
>
>
>
>
>
>  ------------------------------
>
> *From:* Greg Collins [mailto:GCollins at glumac.com]
> *Sent:* Friday, April 09, 2010 2:00 PM
> *To:* Bruce Easterbrook
> *Cc:* equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] Active Chilled Beam/Fan Coil System
>
> Bruce,
>
>
>
> I agree with your theory and the justification, but the question is
> ultimately “how to model it?”  I don’t think you can put in negative heat
> for a baseboard system, hook it up to a chilled water loop and get results
> you can count on.
>
>
>
> Greg
>
>
>
> *From:* Bruce Easterbrook [mailto:bruce5 at bellnet.ca]
> *Sent:* Friday, April 09, 2010 8:59 AM
> *Cc:* equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] Active Chilled Beam/Fan Coil System
>
>
>
>     I'm not totally up on using DOAS with eQuest or with chilled beams
> being in Canada but it would seem to me the OA will have to be used to
> control humidity in the space.  The chilled beam should not be used for
> latent cooling, sensible only, to prevent condensation issues.  The DOAS
> will need to control the dewpoint of the room air and maintain it below the
> operating temperature of the coil in the chilled beam.  The chilled beam
> would only be dealing with the sensible load from the space.  The DOAS would
> do everything else.  The question would be will eQuest allow a single zone
> AHU c/w economizer and a baseboard system with negative heat?  I have never
> tried that with eQuest.
> Bruce Easterbrook
> Abode Engineering
>
> On 08/04/2010 04:46 PM, James Hansen wrote:
>
> I’m interested in this as well – I know that in DOAS systems like active
> chilled beams, the primary air often takes on a fairly large chunk of space
> latent cooling, and if this can’t be passed on from the DOAS system to the
> space, then I don’t see how we can believe the results.
>
>
>
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> **James Hansen, PE, LEED AP*
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> *From:* equest-users-bounces at lists.onebuilding.org [
> mailto:equest-users-bounces at lists.onebuilding.org<equest-users-bounces at lists.onebuilding.org>]
> *On Behalf Of *Greg Collins
> *Sent:* Thursday, April 08, 2010 4:39 PM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] Active Chilled Beam/Fan Coil System
>
>
>
> Hi all,
>
>
>
> I’m working on modeling an active chilled beam system.  It consists of the
> chilled beams and a dedicated unit to provide primary air (mainly
> ventilation air) to the beams at 55 degrees.  I’ve modeled the chilled beam
> system as a fan coil system, but am wondering about my options for modeling
> the primary air.
>
>
>
> My question is this:  If I attach the primary/ventilation air unit to the
> fan coil system in the FC’s Outdoor Air tab under “Outside Air from System”
> will the temperature of the air coming from that unit have an impact on the
> load in the space?  I have a ton of hours at very low load during the winter
> months, and I want eQuest to use the 55 degree primary air as the first
> stage of cooling for the space and not “double up” the cooling energy by
> cooling the 55 degree air and then not use that for cooling in the zones.
>
>
>
> If anybody has some input, it would be appreciated.
>
>
>
> *Greg Collins*
> Design Engineer / Energy Analyst
>
> Mechanical Department
> LEED® Accredited Professional
>
> [image: http://www.glumac.com/glumacsig.gif] <http://www.glumac.com/>
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