blockExhaustDamper

Control of actuated exhaust air dampers without fans
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Information

Control sequence for actuated exhaust damper yExhDamPos without fans. It is implemented according to ASHRAE Guidline 36 (G36), PART 5.N.8. (for multi zone VAV AHU), PART 5.P.6 and PART3.2B.3 (for single zone VAV AHU).

Multi zone VAV AHU: Control of actuated exhaust dampers without fans (PART 5.N.8)

  1. The exhaust damper is enabled when the associated supply fan is proven on uSupFan = true, and disabled otherwise.
  2. When enabled, a P-only control loop modulates the exhaust damper to maintain a building static pressure of dpBui, which is by default 12 Pa (0.05 inchWC).
  3. When uSupFan = false, the damper is closed.

Parameters

TypeNameDefaultDescription
RealdpBuiSet12Building static pressure difference relative to ambient (positive to pressurize the building)
Exhaust damper P-control parameter
Realk0.5Gain, applied to building pressure control error normalized with dpBuiSet

Connectors

TypeNameDefaultDescription
Buildings.Controls.OBC.CDL.Interfaces.RealInputdpBuiBuilding static pressure difference, relative to ambient (positive if pressurized)
Buildings.Controls.OBC.CDL.Interfaces.BooleanInputuSupFanSupply fan status
Buildings.Controls.OBC.CDL.Interfaces.RealOutputyExhDamPosExhaust damper control signal (0: closed, 1: open)

Components

TypeNameDefaultDescription
Buildings.Controls.OBC.CDL.Reals.MovingAveragemovMeaAverage building static pressure measurement
Buildings.Controls.OBC.CDL.Reals.SubtractconErrControl error
Buildings.Controls.OBC.CDL.Reals.PIDconPBuilding static pressure controller
Buildings.Controls.OBC.CDL.Reals.SwitchswiCheck if exhaust damper should be activated

Revisions

  • October 15, 2020, by Michael Wetter:
    Moved normalization of control error to PID controller.
    This is for #2182.
  • October 17, 2017, by Jianjun Hu:
    Changed model name.
  • May 12, 2017, by Jianjun Hu:
    First implementation.