: Assigning a "feet of straight duct" value to each fitting. Loss Coefficient ( : Calculating loss as Accessory Pressure Drop
: Section number, duct width/diameter, height, and length. Airflow Data : Volumetric flow rate (CFM or ) and air velocity ( esp calculation hvac excel sheet
Where the pressure loss ($\Delta P$) for any component is calculated as: $$\Delta P = C \times P_v$$ : Assigning a "feet of straight duct" value to each fitting
If you’ve ever commissioned an Air Handling Unit (AHU) or a Ducted Split system only to find the airflow is too low, you’ve likely battled . esp calculation hvac excel sheet
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If you’re designing large commercial systems, your Excel sheet should include:
Once your sheet calculates a number (e.g., ), you must verify it against the Fan Selection.