The is the industry-standard resource for loss coefficients ( Cocap C sub o
Defines the cross-sectional shape (e.g., R for Rectangular, C for Round, F for Flat Oval).
To build a reliable calculation engine, structure your Excel workbook into three distinct operational layers: 1. The Raw Data Tab (The Database)
Here’s a concise write-up on the format, covering its purpose, typical content, and practical uses. ashrae duct fitting database excel
Click to pipe clean data straight into your Fitting_Data tab. Custom VBA Functions for
: Search by code (e.g., SR4-2 for rectangular transitions, CR3-1 for elbows). Generate Results : The software calculates the loss coefficient (K-factor) and the associated pressure loss in Pascals or inches of water column. 2. Transfer Data to Excel
[System ID] -> [Segment Description] -> [Airflow (CFM)] -> [Duct Size] -> [Velocity (FPM)] -> [Velocity Pressure (in. w.g.)] -> [Fitting Code] -> [Looked-up Co] -> [Fitting Pressure Drop] -> [Cumulative Loss] 3. The Summary Dashboard The is the industry-standard resource for loss coefficients
High-velocity systems or extreme fitting geometries can result in calculation errors (like #DIV/0! or #VALUE! ). Always wrap your lookup formulas in an IFERROR statement to maintain a clean sheet layout and provide fallback safety factors. Compliance and Best Practices
Shape (Round/Rectangular), Width/Diameter, Height, Length (ft or m) Friction Calculation: Friction Factor ( ), Straight Pressure Drop per 100 ft, Section Friction Loss
The standard velocity pressure formula assumes standard air density ( Click to pipe clean data straight into your Fitting_Data tab
An Excel calculation sheet displays the logic clearly:
CSV and XML export capabilities mean that Excel can serve as a bridge between the DFDB and other tools in the ecosystem. You can export fitting data from the database, manipulate and augment it in Excel, and then import it into CFD software, energy modeling tools, or proprietary design applications.