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[EnergyPlus_Support] DSF

I have two questions about double skin facade model.

1. I input the DSF as a separate zone. In a DSF, there should have two  
opening to let the air flow in and out. I had input the opening as two 
methods. The first one is add two windows in Heat transfer surface:sub 
on the surface of DSF. The second one is add two opening in Airflow 
Network: Detailed Opening Component on the surface of DSF. But they 
have two different results of volume flow rate. Which one is correct??

2. Also, the airflow rate from node 1 to node 2 (inside to outside) in 
DSF should be equal to the airflow rate from node 2 to node 1 (Outside 
to inside), because of the conservation of mass. However, they are not 
equal. It's there any reasons??



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