External Static Pressure is the sum of all resistance the fan must overcome outside the unit casing. In your Excel sheet, your final "Total ESP" cell should follow this logic: Duct Friction Loss Fitting Dynamic Loss Accessory Pressure Drops
is the resistance to airflow imposed on an air handling unit (AHU) or furnace by the ductwork and components external to the unit cabinet itself. esp calculation hvac excel sheet
Use load calculations (Manual J) to determine the required airflow. 2. Measure or Estimate Duct Resistance External Static Pressure is the sum of all
Calculate actual segment loss: = (Friction_Rate / 100) * Segment_Length 4. Automation and Advanced Excel Features
Compile the manufacturer-rated pressure drops for all components housed inside or inline with the air stream. Ensure you use the "dirty filter" pressure drop specification rather than the "clean filter" drop to ensure the system can deliver design airflow over its entire maintenance cycle. 4. Automation and Advanced Excel Features