Modelling UFAD for LEED

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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

jai yadav's picture
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Joined: 2011-10-02
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That is the preferred way to do it for LEED.

--

Chris Schaffner, PE

The Green Engineer, LLP is a Certified B Corporation

From: jai yadav Reply-To: jai yadav Date: Wed, 12 Oct 2011 18:05:31 +0530 (IST)
To: "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

Christopher Schaffner's picture
Joined: 2011-09-30
Reputation: 0

Jai
You should use e+ for this kind of analysis. It has a couple of stratified
zone models to choose from without the need to fudge some kind of "plenum".
Kind regards
Chris

Chris Yates2's picture
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Joined: 2011-10-02
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Either EnergyPlus or IES VE.

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Nathan Kegel

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