.AixLib.Fluid.Movers.Compressors.BaseClasses.PartialModularCompressors.VolumetricEfficiency .AixLib.Fluid.Movers.Compressors.BaseClasses.PartialModularCompressors.VolumetricEfficiencymodel VolumetricEfficiency = Utilities.VolumetricEfficiency.SpecifiedEfficiencies.ConstantEfficiency;