[Bldg-sim] Modeling UFAD for LEED

[Paul Riemer]

Ethen,

With your LEED submission, include a supporting narrative with precise and consistent with use of the terms UFAD and thermal displacement ventilation (TDV).  Not all  UFAD systems achieve TDV throughout the zone  and not all systems that do deliver air under the floor.  The EDR simulation guidelines and the design briefs do a decent job of distinguishing these facts.  The design briefs also pick up on the zone air distribution effectiveness (Table 6-2) of ASHRAE Standard 62.    I strongly believe that designs and energy models should incorporate the impact of air distribution effectiveness.

Good luck,

Paul Riemer, PE, LEED AP BD+C
DUNHAM

From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Christopher Schaffner
Sent: Wednesday, October 12, 2011 12:40 PM
To: jai yadav; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Modelling UFAD for LEED

That is the preferred way to do it for LEED.

--

Chris Schaffner, PE
LEED Fellow
Founder and Principal

The Green Engineer, LLP
Sustainable Design Consulting
50 Beharrell Street
Concord, MA 01742
T: 978.369.8978
M:978.844.1464
chris at greenengineer.com<mailto:chris at greenengineer.com>
www.greenengineer.com<http://www.greenengineer.com>

The Green Engineer, LLP is a Certified B Corporation

From: jai yadav <jaivardhany at yahoo.com<mailto:jaivardhany at yahoo.com>>
Reply-To: jai yadav <jaivardhany at yahoo.com<mailto:jaivardhany at yahoo.com>>
Date: Wed, 12 Oct 2011 18:05:31 +0530 (IST)
To: "bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>" <bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>>
Subject: [Bldg-sim] Modelling UFAD for LEED

Dear Energy Simulators

I have to model Under Floor Air Distribution (UFAD) for one of LEED projects. I went through the document at the link http://www.energydesignresources.com/media/2654/EDR_DesignGuidelines_%20HVAC_Simulation.pdf to model UFAD in eQUEST. The major assumption in this method to model UFAD is to create a plenum zone, to model the effect of a thermally stratified zone above the occupied zone, and transfer a fraction of People (25%), Lighting (33%) and Equipment (33%) loads in that zone.

Is this method to model UFAD acceptable for simulations carried out to show LEED compliance? Has anyone else used this method before? Or is there any other method to model UFAD?

Your comments would be highly appreciated. Thanks in advance.

Regards
Ethen
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