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Residential Duct Systems Design

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ACCA Manual D, 3rd Edition Residential Duct Systems Design Calculations Excel Spreadsheet

Description:

Use the printed D3 manual for guidance to enter information into the Effective Length, Friction Rate and Duct Sizing tabs.

Help Section

Refer to Manual D Residential Duct Systems, Third Edition Version 1.xx

Step 1:

  • Go to the Effective Length Tab and enter up to 4 supply runs to determine the longest equivalent run in the system.
  • Enter the linear feet of trunk and runout ducts in the length sections for the supply ducts.
  • Click on the Group Code and find the equivalent feet for all fittings used in the selected supply runs.
  • The program will automatically select the "Total Equivalent Feet" to be used in the Friction Rate Tab.
  • Repeat the steps above for the return ducts.

Step 2:

  • Go to the Friction Rate Tab and enter the "External Static Pressure" and "CFM" for the selected equipment.
  • Next enter "Component Pressure Losses" for all components and accessories external of the fan unit.
  • The program will automatically calculate the "Design Friction Rate" value to be used for Duct Sizing.

Step 3:

  • Go to the Duct Sizing 1 Tab and enter the heating and cooling BTUH for each supply run.
  • There is a maximum of 14 supply runs per unit.
  • For larger rooms divide the BTUH by the number of runs required for proper distribution of airflow.
  • The program will automatically select the duct size for round metal ductwork.
  • For rectangular metal ductwork enter the height and the program will automatically select the duct size.
  • If Flex Duct is used refer to the Equivalent Flex column to select the correct duct size.
  • Under the supply truck section, select the associated supply runs for this supply trunk section and the CFM will automatically calculate.
  • The program will automatically select the duct size for round metal ductwork.
  • For rectangular metal ductwork enter the height and the program will automatically select the duct size.
  • If Flex Duct is used refer to the Equivalent Flex column to select the correct duct size.
  • If more than four (4) supply trunk sections are required select the Duct Sizing 2 Tab .
  • Repeat the steps above for the return ducts.

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Residential Duct Systems Design Calculations Excel Spreadsheet

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