Fabric Duct and Pressure Test Results
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Transcript of Fabric Duct and Pressure Test Results
![Page 1: Fabric Duct and Pressure Test Results](https://reader035.fdocuments.in/reader035/viewer/2022071815/55a932531a28ab3a368b46e4/html5/thumbnails/1.jpg)
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Friction loss on fabric duct system by DuctSox
Effects on velocity pressure, static regain and static pressure
Effects on the uniformity of the outlet air
![Page 3: Fabric Duct and Pressure Test Results](https://reader035.fdocuments.in/reader035/viewer/2022071815/55a932531a28ab3a368b46e4/html5/thumbnails/3.jpg)
Research done at the Mechanical Engineering department of Tennessee Tech University (TTU)
Same research lab trusted by ASHRAE to create ASHRAE’s Duct Fitting Database
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DuctSox comparing two fabric duct systems:
› Fabric duct with an internal frame
› Fabric duct without an internal frame
Results:
› Pressure loss difference between two types of systems is very small
![Page 5: Fabric Duct and Pressure Test Results](https://reader035.fdocuments.in/reader035/viewer/2022071815/55a932531a28ab3a368b46e4/html5/thumbnails/5.jpg)
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Static pressure is provided by the HVAC unit (AHU)
Inflation and operation of a fabric duct system is dependent on static pressure (SP), NOT inlet velocity
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Velocity pressure (VP) is kinetic energy and slowly changes forms to a useful potential energy or static pressure regain (SPR) as the air travels down the constant diameter duct
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For most systems, the pressure will be higher at the endcap than at the inlet due to SPR
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In fabric duct system, SPR is common occurrence due to constant diameter sizing
Internal damper (or AFD) is used to adjust SP and reduce the pressure difference
AFD creates more uniform air dispersion through the whole length of duct
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