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RE: [EnergyPlus_Support] Air Flow Network and Infiltration


When you use Airflow Network, you are defining a complex air flow based on wind pressure and temperature differences.� Normal infiltration settings are not counted.� If you want them, you will need to define additional Airflow Network objects that can generate the additional flow.� This is not an easy task unless you know a lot about your building and you have appropriate data.



I have a project where we measured actual building air infiltration, divided the flow across all windows and a known hole in the roof, and ran a simulation using a CFD wind analysis and actual site measured weather.� Our model was within 7% of the actual measured energy for winter heating.� When we applied “recommended” infiltration values without the airflow network, model predicted about 60% more energy use than we actually had.



So I guess the real question is what do you want to learn from the model?



Ned Lyon, P.E. (MA, WV)
Staff Consultant

SIMPSON GUMPERTZ & HEGER
781.907.9000�main
781.907.9350 direct�
617.285.2162 mobile�
781.907.9009�fax
www.sgh.com



From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]
Sent: Wednesday, May 14, 2014 4:20 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Air Flow Network and Infiltration





I am trying to use AirFlow Network objects for the first time to model natural cross ventilation thru a room with two windows on opposite facades.

How does the model account for infiltration? I am getting a warning saying that ZoneInfiltration objects will not be simulated if Specified AirflowNetwork Control = "MultizoneWithoutDistribution" and ZoneInfiltration:* objects are present.

Thanks!

ibone






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