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

[Bruce Easterbrook]

     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] *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
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