[Equest-users] HRVs with Active Chilled Beams

[Kasun, Darryl]

Thank you for the reply Bill.  I have not yet tried modeling the system as IU yet but might have to if I can’t get the work-around to work for me.  

 

I just want to understand how eQuest is modeling my inputs.  Right now I have a Single Zone Reheat system with a dummy zone attached to it, currently with no loads in the dummy zone.  Outdoor air from the SZR system is attached to FCUs, UFAD, displacement ventilation and chilled beam systems.  I’ve modeled the FCUs, UFAD & displacement vent. systems as a FCU system type in eQuest and the Chilled Beams as an IU system in eQuest.  In eQuest, you cannot  input any info on R/A for a Fan Coil system, while you can for an IU system.

 

What I want is the return air from all zones to make it back to the HRV but eQuest is not seeing any R/A.  So for the HRV to see a higher R/A temp I have to add a load to the dummy zone?  Will eQuest see this load before it delivers outside air to the other systems?  Or does the air get distributed to the dummy zone and other systems concurrently?  Thanks for any clarifications.

 

From: Bishop, Bill [mailto:wbishop at pathfinder-ea.com] 
Sent: April-14-11 4:35 PM
To: Kasun, Darryl; equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] HRVs with Active Chilled Beams

 

Darryl,

This is probably the most common work-around situation in eQUEST. I’ve heard a rumor that some brave modeler out there uses a dummy zone for heat recovery by adding just the right space load (on a separate meter) to the dummy zone to tweak the return air temperature back to the HRV. I tend not to read the “dummy zone” posts so this might be more common than I am aware. Instead, I suggest you abandon the dummy zone approach and model the AHU/HRV using the Induction Unit system type. The IU system allows heat recovery and zonal CHW coils, but does have its drawbacks (e.g. no VAV). You might need to break out the FCUs as separate systems to account for the fan energy. I haven’t been “fortunate” enough yet to model displacement ventilation but perhaps another eQUEST work-arounder will chime in.

Regards,

Bill

 

William Bishop, PE, BEMP, LEED® AP | Pathfinder Engineers & Architects LLP

Mechanical Engineer

 

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From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Kasun, Darryl
Sent: Thursday, April 14, 2011 2:29 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] HRVs with Active Chilled Beams

 

I’ve been attempting to model a building that has two AHUs complete with HRVs that serve active chilled beams, FCUs and displacement ventilation.  Based on some threads I’ve seen on here, I’ve set up the air to supply from the HRVs through a dummy zone and to the subsequent air systems that model the ACBs, FCUs, etc.  

 

I’ve ran the model and no air is making its way back from the zones served by the ACBs, FCUs ,etc to the HRVs.  How is this accomplished?  Thanks

 

 

 

Darryl Kasun ● Engineer in Training
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