Provides a tool to perform the various flow rate estimations based on predefined processing in the software. This tool is not an HVAC analysis software. You use the Flow Calculator when you select duct size or confirm the flow rate of routed duct.
This dialog box provides three types of calculation methods. After you change the method, the input and output values change dynamically. After clicking the Calculate button with required input values, the software completes the calculation and displays the results on the dialog box.
Method
Organizes the possible options to use in the estimation. The input and output controls change dynamically, depending on the method that you select. Select one of the following methods:

Flow rate and velocity >= diameter and loss per length (default setting)

Flow rate and loss per length >= diameter and velocity

Flow rate and diameter >= velocity and loss per length
Calculation values
Organizes the values used in the estimation. The boxes under the Inputs heading contain the values that the algebraic equations use. In the Results column, the software displays the outcome of the equations.
Flow rate
Defines the flow rate to use in the estimation. In this context, flow rate is the quantity of fluid flowing per unit of time. Flow rate is used as input for all methods.
Velocity
Defines the velocity to use in the estimation. Velocity is used as input for the first method and used as output for the second and third methods.
Diameter
Defines the diameter to use in the estimation. Diameter is used as output for the first and second methods and used as input for the third method.
Press loss per length
Defines the loss of pressure in a length of a duct run. The value for Press loss per length is used as output for first method and third methods and used as input for the second method.
Shape conversion
Organizes the values that change the properties for a rectangular or flat oval feature during the estimation.
Rectangle
Displays a row of values used to estimate for a rectangular feature. The values include Width ratio (for each cross section based on the ratio of depth / width), Corner radius (of the rectangular cross section), Width (which is converted from the diameter), and Depth (which is converted from the diameter).
Flat oval
Displays a row of values used to estimate for a flat oval feature. The values include Width ratio (for each cross section based on the ratio of depth / width), Width (which is converted from the diameter), and Depth (which is converted from the diameter).
Calculate
Runs the equations based on the values that you have entered when you click this button.