Mandates strict limits on fan system brake horsepower (BHP). Accurate fitting data prevents over-sizing fans, keeping designs within legal energy boundaries.
Instead of static look-up tables, the software calculates coefficients dynamically. Users input specific dimensional ratios (e.g., radius-to-diameter ratio , aspect ratio ) and flow ratios ( ). The software instantly computes the exact Cocap C sub o
Version 6.00.05 introduced several UI and algorithmic enhancements designed to streamline the workflow for mechanical designers. 1. Expanded Fitting Selection ashrae duct fitting database version 60005
For junction fittings like tees and wyes, the database requires users to specify the flow split. Ensure you are accurately identifying the "Main" stream versus the "Branch" stream as defined by the provided ASHRAE diagrams.
The is available as an annual subscription through the ASHRAE Bookstore . Key Application Workflow Mandates strict limits on fan system brake horsepower (BHP)
Enter the volumetric flow rate (CFM or L/s) and velocity.
Understanding the ASHRAE Duct Fitting Database (Version 6.00.05) Users input specific dimensional ratios (e
Instead of relying on outdated, static tables, the DFDB provides detailed, graphically represented data that allows engineers to accurately calculate pressure drop across various fitting types in round, rectangular, and flat oval ducts. Key Features of Modern DFDB (Version 6.00.05 and Later)
ASHRAE TC 5.2 (Duct Design) revisited the empirical data for common fittings, particularly and rounded rectangular elbows . Some coefficients changed by as much as 15% compared to previous versions, meaning designs based on older databases may be significantly under- or over-estimating pressure drop.
While Building Information Modeling (BIM) programs like Autodesk Revit feature native pressure drop calculations, their built-in fitting tables can sometimes be generic or misaligned with ASHRAE standards. Engineers frequently use the standalone DFDB Version 6.00.05 to verify questionable Revit calculations or manually input custom Cocap C sub o
Modern building codes (such as ASHRAE Standard 90.1) mandate strict fan power limitations. Designers must keep static pressure losses as low as possible. By utilizing Version 6.00.05, engineers can quickly test "what-if" scenarios—such as replacing a hard 90-degree mitered elbow with a radius elbow—to observe the immediate drop in system resistance. Enhanced Visualization