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Ductsize - HVAC Duct Sizing and Analysis

Duct Sizing - with Full Control

Ductsize lets you create a complete duct system from start to finish, and gives you control over every aspect of the design. You can let the program size all the ducts for you (using three different sizing methods), or enter your own sizes to analyze an existing design. Or you can do any combination of the two, where you specify the duct sizes through tight areas where there is little room for ductwork, and let the program calculate the sizes everywhere else. If you are an engineer or HVAC designer who wants to step up to the ultimate in a duct sizing program, then Ductsize is for you.

Features

Overview

Ductsize quickly calculates optimal duct sizes using either the static regain, equal friction, or constant velocity method. Data entry can be accomplished manually or taken graphically from either Drawing Board or 32-bit versions of Autodesk Building Systems 2006 or 2007, or 32-bit AutoCAD MEP 2008 to 2012 . Duct sizes can be calculated on a round, rectangular, and flat oval basis. Noise levels and required attenuation are printed for each runout duct. A library of fan data for noise calculations is built into the program. Ductsize allows an unlimited number of duct sections, and is suitable for both constant volume and VAV systems as diversity is accounted for. Ductsize also has an option for specifying duct height and width constraints to control sizes. This feature is also useful for analyzing problems in existing systems where the duct sizes are already specified. Ductsize is based on the design procedures given in the ASHRAE Handbook of Fundamentals and the SMACNA HVAC Systems Duct Design Manual. Important new features include a Project Explorer and corresponding report that provide a tree-style graphical representation of all trunks and runouts in the project. In addition, both supply and return duct systems can be entered in the same project.

Calculation Method

The Ductsize Program is based on the design procedures given in the ASHRAE Handbook of Fundamentals, the ASHRAE Duct Fitting Database, and the SMACNA HVAC Systems Duct Design manual. The program can calculate using either the static regain, equal friction, or constant velocity methods. The user's manual gives detailed information on the exact equations used, and explains how to manually verify program results.

Program Input

All input data is checked at the time of entry so that no improper data can be entered. Four types of data are requested: general project data, system and fan data, trunk data, and runout data. The general project data includes the project name, location, client name, duct material, desired sizing method, and more. The fan system data includes the fan type, minimum and maximum allowable air velocities, desired noise levels and more. The trunk and runout data includes such information as duct length, connection numbers, material type, insulation R-values, fitting quantities, runout cfm values, and any duct height and width constraints. Optionally, input data can be taken directly from a duct drawing file created in 32-bit versions of Autodesk Building Systems 2006 or 2007, or 32-bit AutoCAD MEP 2008 to 2012, or from Ductsize's own Drawing Board window.

Program Output

Ductsize provides four basic output reports: general project data, trunk and runout sizing information, and noise analysis. In addition to these reports, if you also purchase Drawing Board you can print out the floor plan view of your duct system, complete with duct and fitting names, flow arrows, and register sizes and orientation.

Link to 32-bit versions of AutoDesk Building Systems 2006 and 2007, and 32-bit AutoCAD MEP 2008 to 2012.

The Static Regain version of Ductsize can import duct systems from a dwg file created with 32-bit versions of Autodesk Building Systems 2006 or 2007, or 32-bit AutoCAD MEP 2008 to 2012. You simply click on the main trunk of the system you want to import from the dwg, and Ductsize then imports all the duct information from that system of duct objects. Then Ductsize will calculate duct sizes and pressure loss information and automatically assign this data back to the objects on the dwg. Then you can click "Resize System" in ABS or AutoCAD MEP and it will update the drawing and redraw the ducts and fittings with the sizes that Ductsize calculated. This powerful and easy to use feature is only fully enabled in the Static Regain level of Ductsize, but is included with the Demonstration and Equal Friction versions as well in a limited form so you can try it out.

Screenshots

 

Ducts Entered with Drawing Board

Here's a picture of a duct system being entered in Ductsize with the Drawing Board component.

Link to 32-bit versions of AutoDesk Building Systems 2006 and 2007, and 32-bit AutoCAD MEP 2008 to 2012.

Below is the Autodesk Building Systems program, waiting for you to select the Main Trunk for Ductsize to start its import process.

Material Database and Return Trunk Data

System Data and Project Explorer

Supply Trunk Data and Fitting Selector


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