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Re: [EnergyPlus_Support] Airflow network compared to ZoneInfiltration:Effective Leakage Area



Are you sure ZoneInfiltration:EffectiveLeakageArea
is the right object? I thought it considered the possible pressure acting on an opening such as an air intake.

Also, infiltration is mostly wind pressure driven and the walls see the most pressure, not the roof.

For the simple method, there is a 4 coefficient model (can't remember the name...either ZoneInfiltration:something or ZoneVentilation:something), that considered delta T indoor to outdoor and wind m/s. There was a very nice ASHRAE journal article about how to set this up. Perhaps Jim Dirks remembers. We were posting about it, I believe.

On 16 Sep 2015 9:29 pm, "rueboudreaux@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
 

Hello,

I am comparing a simple box house using two different methods for determining the interior RH and temperature.

I used the ZoneInfiltration:EffectiveLeakageArea (ZI:ELA) and compared it to a MultiZonewithoutDistribution version of the airflow network(AFN).  I used the same area for the AFN as in the ZI:ELA just distributed on the flat roof and 4 sides.

When I compare the two I get similar interior temp and moisture outputs but for the AFN i get air change rates that can be 8-10 times that of when I use the ZI:ELA.  Any ideas why this may be the case?

Thanks,
Philip




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Posted by: Jean Marais <jeannieboef@xxxxxxxxx>


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