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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
Pump-Curve Interpolation: Stay Within the Selected Impeller Diameter and Catalog Points
A spreadsheet can produce a smooth pump curve from the wrong points. Lock the model, impeller and speed first, then interpolate only inside a documented interval.
15 hours ago5 min read
Condensate Pump Selection: Duty Flow Is Not Shutoff Head
A maximum-lift label does not establish useful pumping capacity. Calculate the operating flow, then check inflow, cycling, discharge routing and overflow protection.
3 days ago4 min read
Pump Impeller Trimming vs VFD Speed Reduction: Where Affinity Laws Need Care
An impeller trim and a speed change can produce similar preliminary numbers while requiring different evidence. Check the full curve before committing to either.
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
How to Size a Chilled Water Fan Coil Unit (FCU)
Learn the essential steps for sizing a chilled water fan coil unit, including cooling load, airflow, chilled-water flow, external static pressure and final manufacturer selection.
Aug 244 min read
Chilled Water Pump System Design Guidance
Learn how to design a chilled water pump system—from calculating water flow and pipe pressure losses to determining pump head, selecting the correct pump and planning efficient controls. Avoid common design mistakes and discover practical Nexora tools that make HVAC calculations faster and easier.
Aug 245 min read
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