💡 Always verify the "Loss Coefficient" units. Some databases use different reference velocities (main stream vs. branch stream), which can lead to significant errors if not linked correctly in your Excel formulas. If you’d like to build a custom tool, let me know:
), which is vital for proper fan sizing and system balancing. How to Access the "Excel Link"
By nesting these formulas next to your database link, your spreadsheet will dynamically re-calculate system pressure drops the moment you alter the duct size or CFM. Best Practices for Excel-Based Duct Sizing
Efficiency and accuracy dictate the success of modern HVAC engineering. Manual calculation of ductwork pressure loss is tedious and highly susceptible to human error. To combat this, the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) developed the ASHRAE Duct Fitting Database (DFDB). ashrae duct fitting database excel link
: A free version available for iPhone and iPad on the App Store that covers a subset of common fittings.
for organizing your ESP calculations with these ASHRAE fitting values? Duct Fitting Database - ASHRAE
Check out the cloud-based subscription on the ASHRAE Bookstore for the full library. 💡 Always verify the "Loss Coefficient" units
Structure your Excel workbook chronologically. Model the airflow pathway from the most demanding terminal device back to the air handling unit (the critical path). Use distinct columns for: Fitting ID / Tag ASHRAE Fitting Code Reference Airflow Volume (CFM or L/s) Duct Cross-Sectional Dimensions Calculated Velocity and Velocity Pressure Imported ASHRAE Loss Coefficient ( Total Section Pressure Drop Automate Velocity Pressure Computations
The ASHRAE Duct Fitting Database is a collection of experimentally determined loss coefficients for various duct fittings, such as elbows, tees, and transitions. The database contains over 300 duct fittings, each with its own unique loss coefficient data. The database is widely used in the HVAC industry to ensure accurate duct sizing and system design, which is critical for energy efficiency, indoor air quality, and occupant comfort.
For advanced automation, engineers program ASHRAE equations directly into Excel using VBA. Open the Excel Visual Basic Editor ( Alt + F11 ). Create a custom module. If you’d like to build a custom tool,
No. Duct Fitting Database Ver. 6.00.05 is only available as a single-user product. Multiple-user licensing is not available.
The ASHRAE DFDB Lite App and the full iOS version allow users to generate reports. These reports often include a that can be emailed and opened on a desktop, providing a raw data link for further analysis. 3. Third-Party Excel Calculators