Annex60.Fluid.Actuators.BaseClasses.PartialDamperExponential

# .Annex60.Fluid.Actuators.BaseClasses.PartialDamperExponential

Partial model for air dampers with exponential opening characteristics

## Information

Partial model for air dampers with exponential opening characteristics. This is the base model for air dampers and variable air volume flow boxes. The model implements the functions that relate the opening signal, the pressure drop and the mass flow rate. The model also defines parameters that are used by different air damper models.

For a description of the opening characteristics and typical parameter values, see the damper model Annex60.Fluid.Actuators.Dampers.Exponential.

## Revisions

- January 27, 2015 by Michael Wetter:
  Set `Evaluate=true` for `use_constant_density`. This is a structural parameter. Adding this annotation leads to fewer numerical Jacobians for `Buildings.Examples.VAVReheat.ClosedLoop` with `Buildings.Media.PerfectGases.MoistAirUnsaturated`.
- December 14, 2012 by Michael Wetter:
  Renamed protected parameters for consistency with the naming conventions.
- January 16, 2012 by Michael Wetter:
  To simplify object inheritance tree, revised base classes `Annex60.Fluid.BaseClasses.PartialResistance`, `Annex60.Fluid.Actuators.BaseClasses.PartialTwoWayValve`, `Annex60.Fluid.Actuators.BaseClasses.PartialDamperExponential`, `Annex60.Fluid.Actuators.BaseClasses.PartialActuator` and model `Annex60.Fluid.FixedResistances.PressureDrop`.
- August 5, 2011, by Michael Wetter:
  Moved linearized pressure drop equation from the function body to the equation section. With the previous implementation, the symbolic processor may not rearrange the equations, which can lead to coupled equations instead of an explicit solution.
- June 22, 2008 by Michael Wetter:
  Extended range of control signal from 0 to 1 by implementing the function exponentialDamper.
- June 10, 2008 by Michael Wetter:
  First implementation.

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