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

[Grando, John]

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(r) Accredited Professional

[cid:312045819 at 09042010-3512]<http://www.glumac.com/>
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