BuildingSystems.Fluid.HeatPumps.ModularReversible.RefrigerantCycle.Inertias.VariableOrder

# .BuildingSystems.Fluid.HeatPumps.ModularReversible.RefrigerantCycle.Inertias.VariableOrder

Inertia using a critical damper with variable order

## Information

Model that uses a variable order delay to account for inertia.

Following the associated publication by Wuellhorst et al. (2021), this model was used to calibrate the heat pump model. If first order is selected, the frequency `refIneFreConst` equals the inverse of the time constant of a first order delay element.

In usage, be careful with the order of the delay. While a second or third order delay may result in a better fit in calibration, simulation speed is impacted. See the discussion in the paper for more information: https://doi.org/10.3384/ecp21181561

## Revisions

- October 2, 2022 by Fabian Wuellhorst:
  First implementation (see issue #1576)

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