Description: Design flow rate in the inlet cross-section of the system divided by the inlet cross-section of the system; Name: Average design speed in the plant inlet
Description: Rated flow at the inlet area of the installation divided by the inlet area of the installation; Name: Mean rated velocity at inlet area of the installation
Description: input variable to a comparing element in a controlling system, which sets the desired value of the controlled variable and is deducted from the command variable; Name: reference variable