When deploying a new custom Excel sheet, benchmark its outputs against standard ASHRAE DFDB desktop software to verify formula integrity. If you want to build or refine your workbook, let me know:
is the total pressure loss (in inches of water column or Pascals) Ctcap C sub t is the non-dimensional total pressure loss coefficient Pvcap P sub v is the velocity pressure, defined as (in IP units) or (in SI units) The provides empirical Ctcap C sub t
= Velocity pressure of the air stream (Pa or in. wg.), calculated as in Imperial units or in Metric units. ashrae duct fitting database excel
The ASHRAE Duct Fitting Database (DFDB) provides a standardized method for calculating pressure losses in HVAC systems. While the primary software is a cloud-based or mobile application, it allows users to export results to for comprehensive External Static Pressure (ESP) analysis. 1. Report Overview
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Step-by-Step Worksheet Example: Calculating a Rectangular Elbow
Accurate HVAC design requires precise calculation of pressure drops across various duct fittings. For engineers and designers, the is the industry-standard resource for obtaining loss coefficients (C-factors). The ASHRAE Duct Fitting Database (DFDB) provides a
: Covers supply, exhaust, and common (supply/return) duct functions like elbows, transitions, junctions, and straight ducts. : Provides loss coefficients ( and associated pressure loss ( cap delta cap P based on user-input flow rates and dimensions. Platform Availability : Currently offered as a cloud-based subscription (Version 6.0) and a mobile app ( ) for iOS. Integrating Database Data into Excel
ASHRAE offers the Duct Fitting Database in several formats to suit different needs:
| Sheet Name | Purpose | |------------|---------| | | Dashboard, selection & calculation | | ASHRAE_Data | Raw coefficient tables (locked) | | Custom_Fittings | User‑added fittings | | Fitting_Schedule | Log of all fittings for a project | | Help | Instructions & references |