Adrian,
The ventilation philosophies of (DOAS + xxx) and VAV are very different. For any DOAS system, the outdoor air amount is intended to be the minimum required for ventilation … only. For VAV, outdoor air is used for ventilation plus cooling (e.g. economizer).
Each has benefits, but outdoor air is treated differently.
For an interesting comparison between DOAS + chilled beam and VAV, see “VAV Reheat Versus Active Chilled Beams & DOAS” in the May 2013 ASHRAE Journal.
James V Dirkes II, PE, BEMP, LEED AP
www.buildingperformanceteam.com
Energy Analysis, Commissioning & Training Services
1631 Acacia Drive, Grand Rapids, MI 49504 USA
616 450 8653
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of adcamtor
Sent: Sunday, July 14, 2013 4:55 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] economizer [DOAS+Fancoil or PTHP] and [VAV] systems
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