[Equest-users] Underfloor Air Distribution Supply Air

[Pasha Korber-Gonzalez]

I've used this guidebook in the past (see attached) and it has yielded
reasonable results to depict the potential energy savings with UFAD systems
& stratified loads.  Feel free to contact me if you would like more detail
about my experiences simulating UFAD & TD systems.

pasha

On Tue, Jun 8, 2010 at 7:15 AM, Bishop, Bill <wbishop at pathfinder-ea.com>wrote:

> Jonathon,
>
> This Design Guide has information on how to model UFAD using eQUEST:
>
> http://www.archenergy.com/ieq-k12/Public/Proj2_Deliverables/D2.9c_FinalDVDesignGuide_2006-0630.pdf
>
> Regards,
> Bill
>
> William Bishop, EIT, BEMP, LEED® AP | Pathfinder Engineers & Architects LLP
> Mechanical Engineer
>
> 134 South Fitzhugh Street
> Rochester, NY 14608
> T: (585) 325-6004 Ext. 114
> F: (585) 325-6005
> wbishop at pathfinder-ea.com
> www.pathfinder-ea.com
>
> -----Original Message-----
> From: equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] On Behalf Of Andrew Phelps
> Sent: Tuesday, June 08, 2010 8:36 AM
> To: equest-users at lists.onebuilding.org
>  Subject: Re: [Equest-users] Underfloor Air Distribution Supply Air
>
> Jon:
>
> If I understand your email/system description correctly, isn't your
> underfloor system just a series fan powered box, with a zone fan to mix to
> 65F?
>
> I do agree with you that your idea to setup a different AHU for the
> underfloor system by making reasonable assumptions for fan energy (and make
> sure you change the other AHU as well) is a good one.
>
> However, you might want to consider how the UFAD system is heated.  This
> could be an issue especially if your system gets 55F constantly, or if the
> supply air to be mixed is varied based on a reset schedule.  I know that we
> don't really think about it much, but heating energy can be tricky,
> especially in UFAD systems.
>
>
>   Andy Phelps, PE - Mechanical Engineer -  Larson Binkley, Inc.
>      6363 College Blvd., Ste 400 Overland Park, KS 66211 | (T-direct)
> 913-383-5861  |(T-main) 913-383-2621 |(F) 913-383-2831 |
> andrew.phelps at larsonbinkley.com
>
>
>
> Message: 6
> Date: Mon, 7 Jun 2010 15:06:00 -0700
> From: Jon Pfantz <gatorlord at gmail.com>
> To: equest-users at lists.onebuilding.org
> Subject: [Equest-users] Underfloor Air Distribution Supply Air
>        Temperature
> Message-ID:
>        <AANLkTikmr8olZSxB0qtgKmNtjspATCVj5alDCY4kl4b8 at mail.gmail.com>
> Content-Type: text/plain; charset="windows-1252"
>
> Hello all,
>
> Is anybody aware of a method of modeling an underfloor air distribution
> system with different supply air temperatures?  My air handling unit
> partially serves an overhead system with 55 degree SAT and partially serves
> an underfloor system which mixes the 55 degree air with some return air to
> achieve 65 degree SAT.  I?m assuming the best way to model this would be to
> create two separate systems, one for the overhead and one for the
> underfloor, however I?m concerned that I won?t be able to achieve realistic
> system performance.
>
> Thanks,
>
> Jonathon
>
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