Features

• Calculates optimal air conditioning duct sizes.
• Computes round and rectangular duct sizes.
• Four sizing methods available: Nearest Inch, Exact, Use Schedule, and Presize.
• Fitting Selector dialog displays drawings of hundreds of ACCA duct fittings.
• Both supply and return duct systems can be entered in the same project. Return-side duct system losses are automatically accounted for when calculating the supply-side duct system.
• The number of trunks & runouts is virtually unlimited.
• Provides comprehensive color reports which can be printed, previewed on screen and saved to disk.
• Works with high-velocity duct systems as well as conventional systems.
• Uses either English or metric units.

Requirements

You must have active licenses for both Rhvac and Drawing Board.

Overview

Graphic Manual D Ductsize works as a component within Drawing Board and Rhvac to calculate optimum duct sizes. It automatically creates runout ducts in each room of your floor plan and assigns them the proper airflows as calculated by Rhvac. Reports show the static pressure loss of each individual duct as well as the cumulative loss at each point in the system.

Calculation Method

The Graphic Manual D Ductsize component is based on the design procedures given in ACCA's Manual D. The equal friction sizing method is used to determine optimum duct sizes to the nearest inch or centimeter. You can also select to size ducts based on a user-defined schedule of sizes, or exact (nearest tenth of an inch, or millimeter). Or you can select Presize for the sizing method and enter your own diameter or height and width for the duct. Static pressure losses resulting from fittings and dampers are based on Manual D's equivalent length definitions, with the several hundred fitting definitions from Manual D built in to the program, including pictures.

Program Input

Inputting data consists of drawing duct objects and setting their properties in the Object Properties window of Drawing Board, as well as with popup dialogs.

Program Output

The reports are integrated with those of Rhvac, so to see a report of the results just check the checbboxes in the "Graphic Manual D Ductsize" frame on Rhvac's Select Reports dialog. New reports will then be included in the Print Preview window's list of reports. One reports will show you detailed information for each duct followed by a duct system summary that lists key data about the duct system such as the runout with the highest pressure loss and the duct with the largest calculated diameter. The Pressure Changes Graph report will show you the static and total pressure available at each point along the route with the highest static pressure loss.