Som:
Asked same question of E+ help desk several months back.
Here’s the response I got…
The mass flow rates (kg/s) are used in internal
calculations in the AirflowNetwork model. The volume flow rates are used for
report only and mainly designated for multizone airflows and not for airflows
in an air distribution system. They are calculated by dividing the mass flow
rates by the outdoor air density for multizone airflow rates and zeros for
distribution links. I will make changes for the next release. Thanks for
bringing this issue. Lixing
Dave
--
David R. Roberts, P.E.
Senior Engineer
Residential Buildings Group
Electricity, Resources & Building Systems Integration Center
National Renewable Energy Laboratory (NREL)
303.384.7496
From:
EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On
Behalf Of somsgr
Sent: Tuesday, August 25, 2009 7:39 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] AirflowNetwork Volume Flow Rate
I am using AirflowNetwork to estimate duct heat
gain/loss and airflow through each duct section. I got reasonable output for
"AirflowNetwork Mass Flow Rate from Node 1 to 2", but the
"AirflowNetwork Volume Flow Rate from Node 1 to 2" is zero for the
same link (for all links). I appreciate any suggestion to fix the issue.
Som Shrestha
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