Return fan control for AHUs using return fan with airflow tracking
Sequence for controlling return fan yRetFan for AHUs using return fan
with airflow tracking.
It is implemented according to Section 5.16.11 of ASHRAE Guideline G36, May 2020.
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Return fan operates whenever associated supply fan is proven on
(
u1SupFan = true).
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Return fan speed shall be controlled to maintain return airflow equal to supply
airflow less differential
difFloSet, as determined per section 3.2.1.5.
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Relief or exhaust dampers shall be enabled when the associated supply and return
fans are proven on and closed otherwise. Exhaust dampers shall modulate as the inverse
of the return air damper per section 5.16.2.3. This is implemented in
Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.Economizers.Subsequences.Modulations.ReturnFan
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May 20, 2021, by Jianjun Hu:
First implementation.
Generated at 2025-03-13T19:24:49Z
by OpenModelicaOpenModelica 1.24.5 using GenerateDoc.mos
.Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.SetPoints.ReturnFanAirflowTracking