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[EnergyPlus_Support] Re: Airflownetwork zone infiltration air change rate
Hi Annamaria,
I think it means that zone infiltration is the sum of airflow from outside into the zone through openings such as windows and cracks in the exterior surface. If there is no such flows (From the outside to the zone) then the infiltration is zero. But you could still have flows through the constructions and windows from the zone to the outside but then it would be called exfiltration.
This would be the case if you have a fan blowing air into the zone creating a overpressure in the zone which forces air flow through the windows and cracks. Then the infiltration is zero but the exfiltration non-zero.
Best regards
Michael
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Belleri Annamaria <annamaria.belleri@...> wrote:
>
> Hi all!
> I'm trying to understand the airflownetwork output "Airflownetwork zone infiltration air change rate (ACH)". As written in the input output reference, it is "the sum of ventilation and crack flows from the exterior into the zone. "
> The following sentence is: "Zone Infiltration Air Change Rate will be zero if all flows through the zone's exterior surfaces are out of the zone."
> Could anybody explain what does it mean and give some examples?
> Thank you in advance!
>
> _ _
>
> Annamaria Belleri
> Institute for Renewable Energy
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