Ashrae Duct Fitting Database Excel Patched Access

Fittings like elbows (CD3-1), branches (CD5-1), and transitions (CD7-1).

A free mobile app for iOS that includes a subset of common fittings for quick field use.

Despite the sophistication of modern 3D modeling software like Revit or Carrier HAP, a significant portion of detailed HVAC engineering still happens in Microsoft Excel. Engineers prefer Excel for its speed, transparency, and customizability.

For advanced users, basic Excel formulas can make files sluggish when handling hundreds of fittings. ashrae duct fitting database excel

This hidden or protected tab houses the ASHRAE loss coefficient data tables. Because fitting coefficients often depend on ratios (like entry-to-exit area or branch-to-main velocity), structure your tables with clear headings for , Geometry Ratio Inputs , and corresponding Cocap C sub o values . 2. The Calculation Engine Tab

Accurate pressure drop calculation is the foundation of efficient HVAC design. Oversized ducts waste material and space, while undersized ducts lead to noisy systems and overworked fans. For decades, the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) has provided the gold standard for these calculations through the ASHRAE Duct Fitting Database (DFDB).

) based on laboratory testing. These coefficients are critical for calculating dynamic pressure loss using the standard equation: Engineers prefer Excel for its speed, transparency, and

The ASHRAE Duct Fitting Database (often referred to as DFDB) is a comprehensive collection of pressure loss coefficients (

For mobile use in the field, ASHRAE offers a free app for iOS devices that allows pressure loss calculations for select supply, common, and return/exhaust fittings in both I‑P and SI units.

There are two ways this is typically achieved: Because fitting coefficients often depend on ratios (like

Use Data Validation on the "Shape" and "Fitting Code" columns to restrict user inputs to predefined database items. This prevents typographical errors from breaking your backend string-matching formulas.

Pv=(Velocity4005)2cap P sub v equals open paren the fraction with numerator Velocity and denominator 4005 end-fraction close paren squared Excel Formula (Velocity in column D): =(D2 / 4005) ^ 2 Automating the Fitting Coefficient Lookup