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RE: [EnergyPlus_Support] DX Cooling Coil Sizing in EnergyPlus with high outdoor air





Sorry for the jumbled text.  The “Rich Text Editor” doesn’t seem to work very well.  Somewhat improved version below.

 

The Building Performance Team
James V. Dirkes II, P.E., BEMP , LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653

 

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of jvd2pe
Sent: Thursday, December 01, 2011 4:48 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] DX Cooling Coil Sizing in EnergyPlus with high outdoor air

 

 

Dear E+ Forum, I have lately wrestled with autosizing feature in EnergyPlus, especially for DX coils with, say, more than 20% outdoor air
(OA). The extended story goes something like this:

• I want to "autosize" primarily for LEED / ASHRAE 90.1 simulations of a Baseline system.

• Often, I manually size the minimum outdoor air amount to match the Proposed system's outdoor air flow.

• This has unpredictable results. When the OA amount is low, say less than 15% of the total air flow, everything works smoothly. • When the OA flow is higher:

   o E+ calculates the correct

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