Duct Fitting Database Excel | Ashrae

Because ASHRAE coefficients vary dynamically across two variables (e.g., Reynolds number and aspect ratio), a simple lookup is rarely enough. Engineers utilize two-dimensional lookups or interpolation formulas. Using INDEX and MATCH for 2D Arrays

While the standalone ASHRAE DFDB software is useful, an format offers several advantages:

The is a comprehensive collection of loss coefficients (C-values) for a wide range of HVAC duct fittings—elbows, tees, transitions, offsets, dampers, and more. While ASHRAE’s official data is published in the ASHRAE Handbook—Fundamentals (Chapter 34, Duct Design) and the ASHRAE Duct Fitting Database (CD or online tool), many engineers and software developers have transcribed or linked this data into Excel for easier lookup, automation, and integration with design spreadsheets. ashrae duct fitting database excel

For those with access to the official DFDB software, the simplest method is to use the export‑to‑clipboard feature. Navigate to the desired fitting, view its loss coefficient table, copy the data to the Windows clipboard, and paste directly into Excel. This approach gives you full control over how the data are organized and referenced in your workbook.

: Select the longest duct route or the one with the most fittings to determine the maximum pressure drop. Tag Components While ASHRAE’s official data is published in the

Accurate pressure drop calculations are critical for designing efficient HVAC systems. Operating a system with poorly calculated duct hydraulics leads to energy waste, noisy grilles, and space comfort issues. The is the gold standard for identifying loss coefficients ( -factors) for various duct geometries.

The database was developed to meet a pressing industry need: as air distribution system design and optimization procedures became more sophisticated, a computerized database of duct fitting loss coefficients became essential. The DFDB was populated with data for 228 fittings, all of which were documented and checked for accuracy, and an interactive program was developed to access fittings, determine loss coefficients, and compute pressure loss in both IP and SI units. This approach gives you full control over how

Fittings_Library : A master index matching ASHRAE fitting codes (e.g., SD5-1) to their respective descriptive names.

The mobile and desktop versions allow you to email reports that include a spreadsheet attachment for further analysis.