[Bldg-sim] Modeling Laboratory DCV and ASHRAE 62?

[Shaun Martin]

Hi James,

 

In a recent project we used a combination of CFD, the 62.1 IAQ procedure,
and short-term exposure limits from OHS regulations to verify the ACH rate.
The VRP rates were comparatively low.  For an acetone spill event we arrived
at a figure of 8 ACH.  The baseline, then, would be the same.  We had DCV on
the system, but not for lab spaces where ventilation flow was simply turned
down at night.   

 

Shaun

 

 

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of James Hansen
Sent: 4-Feb-13 12:20 PM
To: Building SimForum
Subject: Re: [Bldg-sim] Modeling Laboratory DCV and ASHRAE 62?

 

Sorry, that last sentence didn't make any sense (thanks Bill).  Should read:

 

We have a client that wants a specific ACH rate (100% OA, once-thru system)
that is well above the ASHRAE 62.1 OA requirements for laboratory space in
Table 6-1.  We would like to use VAV hoods, occupancy-based exhaust
modulation, etc.  But since this is considered DCV, is GBCI really going to
require us to bring the lab OA volume down to ASHRAE 62.1 minimum
requirements for the baseline model?  Or will we be allowed to set the
baseline OA flow for the laboratory at the minimum prescribed rates (say 8
ACH), and take credit for flow reduction in the proposed system?

 

 

GHT Limited
James Hansen, P.E., LEED AP
Senior Associate
1010 N. Glebe Road, Suite 200
Arlington, VA  22201-4749
703-243-1200 (office)

703-338-5754 (cell)
703-276-1376 (fax)

www.ghtltd.com <http://www.ghtltd.com/> 

 

From: James Hansen 
Sent: Monday, February 04, 2013 3:06 PM
To: Building SimForum
Subject: Modeling Laboratory DCV and ASHRAE 62?

 

Hi All,

 

Does anyone have clarity on modeling OA flow rates in laboratory spaces,
specifically how they relate to the LEED baseline requirement for OA flow
when the proposed model has DCV?  

 

We have a client that wants a specific ACH rate (100% OA, once-thru system)
that is well above the ASHRAE 62.1 OA requirements for laboratory space in
Table 6-1.  We would like to use VAV hoods, occupancy-based exhaust
modulation, etc.  But since this is considered DCV, is GBCI really going to
require us to bring the lab OA volume(flow reduction) in the proposed
system?

 

Thanks for any advice!

 

GHT Limited
James Hansen, P.E., LEED AP
Senior Associate
1010 N. Glebe Road, Suite 200
Arlington, VA  22201-4749
703-243-1200 (office)

703-338-5754 (cell)
703-276-1376 (fax)

www.ghtltd.com <http://www.ghtltd.com/> 

 

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