Program Excel to calculate the cross-sectional area and subsequent air velocity automatically. For rectangular duct, use this formula for Velocity ( ) in feet per minute (FPM): = (CFM / (Width * Height)) * 144 Calculate Velocity Pressure ( Pvcap P sub v ) using standard air density ( ): = (Velocity / 4005) ^ 2 Step 3: Embed the Fitting Lookup
If you have access to the ASHRAE Duct Fitting Database (Version 5.0, 6.0, or Korean developed tools), you can generate your own Excel sheet:
Identifier for the duct run (e.g., AHU-1 Run A). ashrae duct fitting database excel link
Write a simple query to pull the exact tables containing the fitting coefficients.
The Ultimate Guide to the ASHRAE Duct Fitting Database and Excel Integration Program Excel to calculate the cross-sectional area and
: Changing a duct size or airflow rate automatically updates the velocity pressure and pulls the correct fitting coefficient.
It covers supply, exhaust, and common (supply/return) duct fittings. The Ultimate Guide to the ASHRAE Duct Fitting
ASHRAE periodically updates loss coefficients based on new research. Ensure your external data connections or local source tables are updated to the latest version of the DFDB.
For advanced automation, engineers program ASHRAE equations directly into Excel using VBA. Open the Excel Visual Basic Editor ( Alt + F11 ). Create a custom module.
Program Excel to calculate the cross-sectional area and subsequent air velocity automatically. For rectangular duct, use this formula for Velocity ( ) in feet per minute (FPM): = (CFM / (Width * Height)) * 144 Calculate Velocity Pressure ( Pvcap P sub v ) using standard air density ( ): = (Velocity / 4005) ^ 2 Step 3: Embed the Fitting Lookup
If you have access to the ASHRAE Duct Fitting Database (Version 5.0, 6.0, or Korean developed tools), you can generate your own Excel sheet:
Identifier for the duct run (e.g., AHU-1 Run A).
Write a simple query to pull the exact tables containing the fitting coefficients.
The Ultimate Guide to the ASHRAE Duct Fitting Database and Excel Integration
: Changing a duct size or airflow rate automatically updates the velocity pressure and pulls the correct fitting coefficient.
It covers supply, exhaust, and common (supply/return) duct fittings.
ASHRAE periodically updates loss coefficients based on new research. Ensure your external data connections or local source tables are updated to the latest version of the DFDB.
For advanced automation, engineers program ASHRAE equations directly into Excel using VBA. Open the Excel Visual Basic Editor ( Alt + F11 ). Create a custom module.