BuildingSystems.Fluid.Sensors.Velocity

# .BuildingSystems.Fluid.Sensors.Velocity

Ideal sensor for flow velocity

## Information

This model outputs the flow velocity flowing from `port_a` to `port_b`.

The sensor is ideal, i.e., it does not influence the fluid. If the parameter `tau` is non-zero, then the measured density that is used to convert the mass flow rate into volumetric flow rate is computed using a first order differential equation. Setting `tau=0` is not recommend. See BuildingSystems.Fluid.Sensors.UsersGuide for an explanation.

#### Typical use and important parameters

In order to use the flow velocity sensor, the cross sectional area of the flow channel `crossSection` must be specified in `m2`. For a circular flow channel (e.g. a round pipe) of diameter `diameter`, the cross sectional area can be specified as `crossSection = diameter * diameter / 4 * Modelica.Constants.pi`. See BuildingSystems.Fluid.Sensors.Examples.Velocity for an example implementation with `diameter = 0.1`.

## Revisions

- February 25, 2020, by Michael Wetter:
  Changed icon to display its operating state.
  This is for #1294.
- May 20, 2016, by Marcus Fuchs:
  First implementation. Implementation is based on BuildingSystems.Fluid.Sensors.VolumeFlowRate.

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