Engineering Fundamentals: Friction Loss in Commercial Systems
In high-performance commercial HVAC design, calculating the Static Pressure Loss is critical for proper fan selection and energy efficiency. Most modern duct sizing is based on the constant friction method.
The Darcy-Weisbach Equation
Pressure loss is a function of duct length, diameter, and velocity. We utilize a modified version for air at standard conditions (STP) to ensure accuracy across all Reynolds numbers.
System Effect Factors
Remember that fittings, elbows, and transitions introduce additional turbulence. AeroFlow calculations assume straight runs; add dynamic loss coefficients (C-factors) for total static pressure.