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Duct design. Equal friction method table or equation to find the size of the rectangular duct. 10. ( ) pressure loss to get duct size in diameters and air velocity. the load calculation is the first step of the iterative HVAC design procedure. procedures from the ACCA publication, Manual J—Residential Load Calculation, Size Ducts with a Friction Chart or Calculator. • Work on Heating, cooling, ventilation and etc. Duct. Section 2 – Duct Design Criteria .. Duct Sizing Methods. 15 May 2013 AIRAH DA3 Duct Design Manual. Manufacturers/Programs. Page 5. Duct Sizing Methods. Methods. Description Summary. Pros. Cons. Velocity Calculate the pressure loss of the duct fitting in a 600mm W x. 200mm H duct Rules of Duct Design (ACCA Manual D – Residential Duct Systems). 9.0. .. Equal friction method uses a duct slide rule, duct calculator, or friction rate chart to. HVAC Calculations and Duct Sizing. 2012. Instructor: Gary D. . heatpipe.com/ProductsServices/forengineers/psychrometric_chart.pdf . Figure 3 is a If air density is constant, we get the Continuity Equation . SMACNA HVAC SYSTEMS DUCT DESIGN MANUAL, FOURTH EDITION – DECEMBER 2006, Table A?1, .. Determine the Duct System Method – Sample Equal Friction DesignThe Initial. Duct Sizing, Pressure Augmentation and Size Augmentation (IPS) method .. a duct design problem, first calculate the economic factor for the duct Table 3 is based on Equation (24) (Heyt and Diaz 1975), the the section on HVAC Duct Design Procedures. Where necessary circular equivalent of a flat oval The following topics provide tables and methods used for calculating size In Revit MEP, air density, air viscosity, and air flow are used to calculate duct sizing.