Duct Sizing by Velocity Reduction Method – Step-by-Step HVAC Design Tutorial
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SOLVED: A simple low-velocity duct system (max velocity = 1000 ft/min) is shown below. Size an appropriate circular air duct system if the plenum can provide 0.2 in. wg of static pressure. A diffuser will be installed at the end of each branch that is rated for 0.05 in. wg at the exit. Use the attached chart to design the duct system.40 ft200 cfm20 ftplenum35 ft20 ft40 ft300 cfm30 ftSpecifications: The working fluid is air, there are two 90° elbows on the bottom branch and one elbow on the top
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Duct sizing doesn't stop at velocity, pressure drop matters. In this clip, Jonathan (co-founder at h2x) explains how pressure drop is calculated and why it directly impacts system efficiency and fan sizing. Once you know your flow rate and velocity, pressure drop is the next piece of the puzzle. He walks through the Darcy-Weisbach formula and the key factors: friction factor, duct length, velocity, and diameter. If you design duct systems, this step is critical. This clip is part of a full duct
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Why does duct size directly control velocity? In this clip, Jonathan (co-founder at h2x) breaks down the simple formula that connects airflow, duct area, and velocity. The key insight: you want to size the smallest duct possible, but only if you can keep velocity within acceptable limits. The formula is straightforward: Velocity = Airflow ÷ Duct Area #hvacdesign #mechanicalengineering #ductwork #velocity #mechanicalengineer
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