Base class: efficiency characteristic (eta = f(Q,H,P))
partial function baseEfficiency extends Modelica.Icons.Function; input Real Q "Volume flow in m³/h"; input Modelica.Units.SI.Height H "Head in m"; input Modelica.Units.SI.Power P "Power in W"; input Modelica.Units.SI.Density rho "Density in kg/m³"; output Real eta "efficiency"; end baseEfficiency;