functionwetterAfjei1997
Correction of COP for icing and defrost according to Wetter, Afjei and Glass
Extends from Buildings.Fluid.HeatPumps.ModularReversible.RefrigerantCycle.Frosting.Functions.partialIcingFactor (Base function for all icing factor functions).
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
Buildings.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
Inputs
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.ThermodynamicTemperature | TEvaInMea (from partialIcingFactor) | Evaporator supply temperature. Should be equal to outdoor air temperature | |
| Modelica.Units.SI.ThermodynamicTemperature | TEvaOutMea (from partialIcingFactor) | Evaporator return temperature | |
| Modelica.Units.SI.MassFlowRate | mEva_flow (from partialIcingFactor) | Mass flow rate at the evaporator |
Outputs
| Type | Name | Default | Description |
|---|---|---|---|
| Real | iceFac (from partialIcingFactor) | Icing factor (0: no heat transfer; 1: no effect) |
Revisions
-
April 17, 2025, by Fabian Wuellhorst:
Fix degC unit, for IBPSA #1975 -
December 7, 2023, by Michael Wetter:
Reformulated to make function once continuously differentiable, and to avoid an event that is triggered based onTEvaInMea). -
November 26, 2018 by Fabian Wuellhorst:
First implementation (see issue AixLib #577)