.Buildings.Controls.OBC.ASHRAE.G36.AHUs.MultiZone.VAV.SetPoints.ReturnFanAirflowTracking

Information

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.

• Return fan operates whenever associated supply fan is proven on (u1SupFan = true).
• 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.
• 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

Revisions

• May 20, 2021, by Jianjun Hu:
  First implementation.