Re: [EnergyPlus_Support] Economizer-Outside air

["Michael J. Witte" <mjwitte@xxxxxxxx>]

My apologies for the slow response.

There is a misunderstanding of the meaning of these report variables:

  Zone Mechanical Ventilation Total Volume of Outside Air [m3]

  Zone Mechanical Ventilation Volume Flow Rate [m3/s]

Both of these variables report the quantity of outside air delivered to the 
zone.  Please see the definitions in the Input Output Reference (In v2.2, p.. 
1547, pdf p. 1588).

There are no equivalent report variables that report the total supply air flow 
rate to a zone.  So, Miguel's response (14 Apr) was correct that you must 
report system node flow rates in order to dtermine the total system flow rate.

Mike


On 14 Apr 2008 at 16:27, carmen herrero prada wrote:

> Hello,
> 
> I am trying to simulate an office building with an air system and getting the most of the free cooling available through the use of the economizer. I have set the minimum of outside air per zone to acomplish with the indoor air quality standard regulations, so the outside air varies from that minimum quantity to the maximum needed to meet the cooling load when outside conditions are appropirate.
> 
> But, when i ask for the Zone Mechanical Ventilation Total Volume of Outside Air, that amount is the same that the output for Zone Mechanical Ventilation Volume Flow Rate. My question is, how can I assure that there is some return air flow? Because it seems the system airflow is always outside air with no return rate.
> 
> Thank you,
> 
> Carmen Herrero.
> 
> 
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