Note: Using 1 for the match type allows Excel to interpolate between standard ASHRAE values if your exact geometric ratio falls between database entries. Step 4: Automate Velocity Pressure Calculations
ΔP=Co×Pvcap delta cap P equals cap C sub o cross cap P sub v
If you search Google for "ASHRAE duct fitting database excel link free," you may find file-sharing sites hosting pirated Excel sheets. These pose significant risks:
For decades, the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) has provided the gold standard for pressure loss coefficients through the ASHRAE Duct Fitting Database (DFDB). However, manually looking up coefficients for hundreds of fittings is incredibly time-consuming.
If you own the standalone ASHRAE Duct Fitting Database software desktop application, you can use its built-in reporting tools. Model your duct run within the DFDB software. ashrae duct fitting database excel link
including entry/exit areas, angles, and aspect ratios.
) for more than 200 round, rectangular, and flat oval duct fittings. Why Loss Coefficients Matter
How to Establish the ASHRAE Duct Fitting Database Excel Link
Eliminate manual data-entry typos when transferring coefficients from a lookup table to a calculation sheet. Note: Using 1 for the match type allows
: While Revit 2013 and newer include the DFDB tables internally, you cannot easily "live-link" them to external Excel sheets. Instead, most firms use Revit Pressure Loss Reports and export the schedule data to Excel for final verification. Pro Tip for Excel 🔗
Diameter for round or Width/Height for rectangular. Velocity (v): Air velocity in FPM or m/s.
By establishing an , engineering firms can automate static pressure drop calculations, reduce human transcription errors, and dynamically update calculations when duct sizes or flow rates change. Why Link the ASHRAE Duct Fitting Database to Excel?
Absolutely. The ASHRAE coefficients are derived from real tests (ASHRAE RP-1293, etc.) and are widely accepted for energy modeling. However, manually looking up coefficients for hundreds of
pv=0.602×Velocity2 (SI units)p sub v equals 0.602 cross Velocity squared (SI units) Best Practices for Maintaining Your Link
Many commercial duct design and BIM software suites feature built-in Excel links that utilize the ASHRAE database.
Includes elbows, transitions, junctions, obstructions, and hoods.