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

[Bruce Easterbrook]

Thanks John, chilled beams are also called induction diffusers.
Bruce

On 09/04/2010 03:59 PM, Grando, John wrote:
> 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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> *From:* equest-users-bounces at lists.onebuilding.org 
> <mailto:equest-users-bounces at lists.onebuilding.org> 
> [mailto: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 
> <mailto: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
>
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