.BuildingSystems.Fluid.HeatPumps.ModularReversible.RefrigerantCycle.Frosting.FunctionalIcingFactor.icingFactor .BuildingSystems.Fluid.HeatPumps.ModularReversible.RefrigerantCycle.Frosting.FunctionalIcingFactor.icingFactorReplaceable function to calculate current icing factor
function icingFactor = BuildingSystems.Fluid.HeatPumps.ModularReversible.RefrigerantCycle.Frosting.Functions.partialIcingFactor;