BuildingSystems.Fluid.HeatPumps.ModularReversible.RefrigerantCycle.Frosting.Functions.wetterAfjei1997

# .BuildingSystems.Fluid.HeatPumps.ModularReversible.RefrigerantCycle.Frosting.Functions.wetterAfjei1997

Correction of COP for icing and defrost according to Wetter, Afjei and Glass

## Information

Correction of the coefficient of performance due to icing/frosting according to Wetter, Afjei and Glass (1997).

For more information on the `iceFac`, see the documentation of BuildingSystems.Fluid.HeatPumps.ModularReversible.RefrigerantCycle.BaseClasses.PartialRefrigerantCycle

#### References

Thomas Afjei, Michael Wetter and Andrew Glass.
TRNSYS type: Dual-stage compressor heat pump including frost and cycle losses. Model description and implementation in TRNSYS.
TRNSYS user meeting, November 1997, Stuttgart, Germany.
https://simulationresearch.lbl.gov/wetter/download/type204_hp.pdf

#### Interface

>     function wetterAfjei1997
>       extends BuildingSystems.Fluid.HeatPumps.ModularReversible.RefrigerantCycle.Frosting.Functions.partialIcingFactor;
>     end wetterAfjei1997;

## Revisions

- December 7, 2023, by Michael Wetter:
  Reformulated to make function once continuously differentiable, and to avoid an event that is triggered based on `TEvaInMea`).
- November 26, 2018 by Fabian Wuellhorst:
  First implementation (see issue AixLib #577)

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