[BLDG-SIM] Modeling VAV Exhaust in PowerDOE

Robert Lord rgl.lsbris at lincolne.com.au
Tue Mar 26 13:44:04 PST 2002


I am currently working on a 'green' laboratory building for US Govt - we don't use DOE in any form so excuse my ignorance - our simulation programs (ATAS/BTAS) allow us to model cooling and also dehumidification as separate to exhaust/airflow/pressure needs - we model a "heat neutral" (i.e. air @ "design room air temperature & humidity") supply air that tracks the exhaust and a conventional system that controls sensible & and another that controls latent gains - then we re-combine these airflows. It is often an outworking of that approach that if separate airflows were provided as part of the design, there should be significant energy savings....costs bit up front though...from a modelling point-of-view we are only allowed 8 different day types and 8 different events per day - should be enough -

cheers, and I do think Russell Crowe should have got the Oscar for A Beautiful Mind!

Regards


Rob Lord
Lincolne Scott
1 Gardner Close
Milton Qld 4064
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-----Original Message-----
From: Brian K. Schultz [mailto:brians at paemail.com]
Sent: Wednesday, March 27, 2002 3:58 AM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] Modeling VAV Exhaust in PowerDOE



We are trying to use PowerDOE to model Variable Air Volume Exhaust in the
laboratory spaces in a five-story engineering building.  At the same time we
are trying to adhere to the ECB in ASHRAE 90.1, which does not allow
changing schedules.  We have tried to model it by giving these spaces their
own dedicated VAV unit that supplies 100% outside air (so the exhaust will
track the supply), and has a minimum of 4 air changes per hour of outside
air (per fire code).  This seems reasonable, but does not take into account
the instances when a fume hood is completely open and the exhaust rate
exceeds the required supply for the space.

Does anyone have any experience with VAV exhaust?  Any insight would be
greatly appreciated.  Thanks.


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