Engineers rely on the database to size ducts, select appropriate fittings, and verify that total pressure losses remain within the fan’s external static pressure (ESP) capability. By using DFDB coefficients, designers can accurately predict system performance and avoid costly oversizing or undersizing.
The reliability of the ASHRAE DFDB rests on a solid technical foundation. Each fitting’s loss coefficient is derived from laboratory testing that conforms to , which establishes uniform methods for testing ducts and fittings to determine their flow resistance.
Efficient HVAC design relies on accurate pressure loss calculations. The ASHRAE Duct Fitting Database (DFDB) Version 6.00.05 is the industry-standard software tool used by mechanical engineers to compute loss coefficients for both supply and exhaust duct systems. This version introduces key data updates, enhanced OS compatibility, and a streamlined interface to minimize calculation errors. What is the ASHRAE Duct Fitting Database? ashrae duct fitting database version. 6.00.05
utilizes the ASHRAE Duct Fitting Database to look up loss coefficients when performing pressure loss calculations for duct systems. The DFDB data ensures that Revit models reflect industry‑standard pressure loss behavior, making simulations more reliable.
where:
ΔP=C0×(ρ×V22)cap delta cap P equals cap C sub 0 cross open paren the fraction with numerator rho cross cap V squared and denominator 2 end-fraction close paren C0cap C sub 0 is the dimensionless , is air density, and is air velocity.
Specialized data for different flow directions. Engineers rely on the database to size ducts,
Version 6.00.05 built on these changes by integrating the database and adding real‑time calculation capabilities. For the mobile app, subsequent updates (Version 6.1) refined specific fittings such as SR7‑2, SR7‑3, SR7‑14, SR7‑15, SR7‑16, and SR7‑17.
helps minimize system-generated noise and ensures your equipment operates within its design parameters. Ready to upgrade? ASHRAE Bookstore Each fitting’s loss coefficient is derived from laboratory