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Darcy vs Fanning Friction Factors: Catch the Fourfold Pipe-Loss Error
Mixing a Fanning factor with a Darcy equation changes straight-pipe friction loss fourfold. Check the coefficient convention before adjusting roughness or pump head.
15 hours ago5 min read
Internally Lined Ducts: Recalculate Clear Area Before Pressure Loss
Adding 25 mm lining to an 800 × 500 mm metal opening removes 15.6% of its air area. At unchanged airflow, the effect on velocity pressure is much larger.
16 hours ago5 min read
Duct Expansion Transitions: Angle, Static Recovery and Total-Pressure Loss
A widening duct can gain static pressure while still losing total pressure. Calculate both before assigning a benefit to a longer transition or crediting recovery in the fan calculation.
4 days ago4 min read
Pump Head Calculator Design Suite: Clearer Calculations, Better Design Reviews
Bring pipe losses, fittings, equipment resistance and pump duty into one editable Excel workflow. Explore Nexora’s Pump Head Calculator Design Suite.
Sep 196 min read
HVAC Duct Design and Sizing Handbook: Build a Complete Design Workflow
Explore a practical 25-chapter PDF handbook covering airflow, duct sizing, pressure loss, fan ESP and worked office, villa and large-AHU designs.
Sep 195 min read
How to Design a Chilled Water Piping System Step by Step
Learn how to design a chilled-water piping system step by step—from cooling-load and flow-rate calculations to pipe sizing, pressure-loss analysis, pump-head selection, valves, controls, insulation and commissioning. Includes practical equations, diagrams, tables and a complete worked example for HVAC and MEP engineers.
Aug 2424 min read
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