) from the ASHRAE Database, you can manually calculate the total pressure loss ( ΔPcap delta cap P ) using the following formula:
For elbows, the ratio of the centerline radius to the duct diameter/width. Retrieve Coefficient : The database generates the value based on these inputs. 3. Manual Calculation (Verification) Once you have the coefficient (
: Provides an "Explorer" view for an integrated graphic view of all fittings and pictorial outlines of each fitting. ashrae duct fitting database 2016
: Select the specific geometry (e.g., a 90∘90 raised to the composed with power mitered elbow vs. a 90∘90 raised to the composed with power pleated elbow). Input Design Parameters : Airflow Rate ( ): The volume of air moving through the duct.
| Edition | Key Features | Limitations | | :--- | :--- | :--- | | | ~200 fittings, basic PDF diagrams | No interactive calculator, no Reynolds correction | | 2005 | Added 50 round/rectangular fittings | Poor flat oval data | | 2013 | First web-enabled version | Clunky interface, no mobile support | | 2016 | 350+ fittings, Re correction, API-ready | No native cloud storage | | 2021 | Cloud-based, BIM integration | Requires subscription; 2016 still widely pirated/used | ) from the ASHRAE Database, you can manually
The 2016 edition of the ASHRAE Duct Fitting Database includes several key features that make it an indispensable resource for HVAC professionals. Some of the notable features include:
The ASHRAE Duct Fitting Database is a collection of data on duct fittings, which are used to connect ducts, change airflow direction, and control airflow in HVAC systems. The database provides detailed information on the aerodynamic performance of various duct fittings, including their pressure drop, airflow characteristics, and geometry. This data is essential for HVAC engineers and designers to accurately size ducts, select fittings, and optimize system performance. Input Design Parameters : Airflow Rate ( ):
A 350-bed hospital in Ohio faced excessive static pressure in its isolation ward supply duct. The original design (1999) assumed mitered elbows with (C=1.5). Engineers re-analyzed using the and found: