Re: [EnergyPlus_Support] OA to zone calculation

[Vinay Devanathan <vinay.devanathan@xxxxxxxxx>]

Dr. Li,

 

Thanks for your reply. So the OA inlet to zone is a fraction of the total OA fed in to the system right? How is that fraction calculated by E+? Is it based on a simple total airflow ratio to each zone vs. total system airflow?

 

Vinay

On Sun, Jul 24, 2011 at 1:20 PM, YuanLu Li <yli006@xxxxxxxxxxx> wrote:

 

Once the inlet air is mixed with return air, it  is just mixed air in the air loop.  The inlet OA is a fraction of the total air fed to the zones. 
 
The zone sizing is only a guide to add the OA amount.  The OA controller has the control of the air inlet amount. The OA controller is an item you add in for simulation. The inlet OA actuator may not normally be  found in a real building.
 
It is only those who wanted 100% OA supply  to the zones worry about this.
 
In a hospital, the oxygen and clean fresh air supply are piped to each bed location.

 Dr. Li  

 

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To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: vinay.devanathan@xxxxxxxxx
Date: Sat, 23 Jul 2011 23:33:32 -0400
Subject: [EnergyPlus_Support] OA to zone calculation

 

Hello,

I have been wondering about this question for a while now.

Let's say the system's OA requirements are defined by using a
Controller:OutdoorAir object. So this is the amount of minimum/maximum
OA that system brings in. But if there is no zone sizing done (all air-
side parameters hardwired), how does EnergyPlus calculate the
distribution of OA supply to different zones the system is serving?

Thank you.

Vinay

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