 asked in category: General Last Updated: 29th February, 2020

# What is velocity pressure in duct?

Velocity pressure: It is the pressure generated by the velocity and weight of the air, which is used for measuring the flow (cfm) in a system. Static pressure plus velocity pressure equals total pressure. Pressure in the ductwork is measured in inches of water column (in-wc).

Similarly, it is asked, what is velocity pressure in HVAC?

In a moving fluid, velocity pressure (VP) is the pressure that would induce an equivalent velocity if applied to move the same fluid through an orifice, so that all pressure energy is converted into kinetic energy. It is used in air conditioning, heating and ventilating work to determine air velocity.

Additionally, how is velocity pressure related to air velocity? Application Note: Basics of Air Velocity, Pressure and Flow. Air velocity can be measured by sensing the pressure produced by the movement of the air. As the velocity of the air increases the pressure also increases inside the pitot tube with respect to the ambient atmosphere.

Thereof, how do you calculate velocity pressure in duct?

Velocity pressure is calculated by taking the difference of the total pressure and static pressure. To measure the velocity pressure, connect a Pitot or averaging tube to a velocity sensor and place the tube into the air flow of the duct.

How do you convert pressure to velocity?

Pressure is inversely proportional to velocity, so we have lower pressure at the exit of the nozzle. But as per definition of pressure, P=F/A, i.e., pressure is inversely proportional to the area which contradicts the above explanation on basis of continuity and Bernoulli equation.

### What does flow rate mean?

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29th February, 2020

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