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Pressure Control with VAV Diffusers

Posted by Price Industries on December 31, 2019 at 9:13 AM

Consider Various Pressure Control Methods in a VAV System

All diffusers become noisier with higher pressures at their inlet and this is true for VAV diffusers.  Pressure is often reduced by the use of a balancing damper or terminal unit, but VAV diffusers are unique as they have a built in VAV damper that can close down to a minimum flow. 

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Topics: Diffusers, Pressure Drop, HVAC Fundamentals, hvac, Design Engineering, Tech Tip

What is System Effect?

Posted by Price Industries on September 10, 2019 at 9:47 AM
In duct design and installation, system effect is the generation of higher than expected pressure drops through changes in duct direction or geometry. It can also be caused by improper installation of  fittings, which result in excessive, unanticipated turbulence in the airflow. In short, system effect is the installed pressure drop which is different from the design pressure drop.
 

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Topics: System Effect, Static Pressure, Outlet Conditions, Pressure Drop, Velocity Profile, Inlet Conditions

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