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RE: [EnergyPlus_Support] ASHRAE 90.1 - VAV with reheat will overheat zone at very high ODA
Sounds perfect (and consistent with normal design practice and physics)
James V Dirkes II, PE, BEMP, LEED AP
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From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Jean marais
Sent: Friday, October 12, 2012 3:07 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] ASHRAE 90.1 - VAV with reheat will overheat zone at very high ODA
Dear group,
Until now I have used the following interpretation of Appx G.
The supply air temperature to the zone is defined as the "design supply air temperature"..."design" meaning for the design day or worst case. To me this is a maximum, not a constant. Therefore, the reheating coil should try and maintain the room temp, not the outlet coil temp, but the outlet coil temp may not exceed the maximum of the "design supply air temperature". This way you can avoid overheating a room that has very high ODA requirements.
Do you follow?
Regards,
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