I have used the AirFlowNetwork with IdealLoads. I think the assumption is IdealLoads can provide heating and cooling that does not change space pressure at
all (perfectly balanced). A defined mechanical system (supply or exhaust) is going to interact with building pressure and change the air flow pressure relationships. I haven’t tried it yet (I’m working on calibrating a building now that has a constant exhaust),
but having an outdoor air supply or exhaust form a space should change the AirFlowNetwork results.
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: Tuesday, October 07, 2014 11:30 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] How does Airflow Network really work?
Hello all,
It seems that Airflow Network has some things that "Cannot Do or Restricted".
For example, IOReferece says specifically:
"The model is restricted to using a constant volume fan (Fan:ConstantVolume and Fan:OnOff) and cannot model variable volume fan equipment."
However, it seems that AirflowNetwork:Distribution:Component:Fan admits a Variable Fan.
Is IOReference outdated?
Also, what happens if you define an AirLoopHVAC but do not "connect" its definition to the AirflowNetwork (e.g. you define a Fan:VariableVolume but don't define the corresponding AirflowNetwork:Distribution:Component:Fan)
Or if you use IdealLoads systems, which do not have any connection to the Airflow Network definition?
What aspects from the HVAC systems are considered somehow in the Airflow Network simulation and which are not?
I think this is not clear in E+ reference.
Regards,
Germán Campos
__._,_.___
Posted by: "Edward G. Lyon" <EGLyon@xxxxxxx>
Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx
The primary EnergyPlus web site is found at:
http://www.energyplus.gov
The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/
Attachments are currently allowed but be mindful that not everyone has a high speed connection. Limit attachments to small files.
EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
__,_._,___