Below is a simple model for determining duct sizes. Ductsize lets you create a complete duct system from start to finish, and gives you control over every aspect of the design. Larger volumes or higher static pressures should be dealt with on an individual. Principle of duct design in hvac systems cedengineering. This equalfriction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications.
Duct calculator is a powerful tool that provides access to duct calculation and sizing capabilities either. Duct design quick introduction duct sizing tools and methods recommended duct velocities and noise effects. Fibrous glass insulated hvac duct systems 4 sheet metal ducts with exterior fibrous glass exterior insulation flexible blanket fibrous glass duct wrap insulation is designed for application to the exteriors of commercial and residential sheet metal heating, ventilating, and airconditioning ducts and plenums operating at temperatures between 40. Increased friction rate in compressed flexible duct. Because of the complexity of designing duct systems, we highly recommend using the acca manual d for sizing ductwork, or consulting a professional hvac contractor. The types of fittings to be used based on the designers calculations of fitting losses i. Refer to the links on the left for more information. Quick introduction a good duct design is a balance between. The following duct sizes are based on a fraction drop of. Download hvac duct construction tables according to smacna and rule of thumbs pdf. New ductsizing calculator available from ashrae and adi. The table below can be used to compare equivalent diameters for rectangular and round circular ducts, ductwork sizing, friction loss, sheet metal gauges, etc. The manual d is a complete schematic drawing of the duct system including locations and sizes of trunklines, branch ducts, outlet registers, an inlet grilles getting a complete manual d hvac design done on your property plans is the best way to ensure that your heating and cooling system will deliver maximum comfort at high efficiency.
Related commercial resources ashrae handbook fundamentals chapter. Rightsizing of a heating, ventilation, and airconditioning hvac system is the selection of. Air flow problems have plagued the hvac industry for years. Design cfm 4 cfm 6 cfm 8 cfm 10 cfm 12 60 6x4 60 4x6 90 4x8 120 4x10 150 4x12 90 8x4 110 6x6 160 6x8 215 6x10 270 6x12 120 10x4 160 8x6 230 8x8 310 8x10 400 8x12 150 12x4 215 10x6 310 10x8 430 10x10 550 10x12 180 14x4 270 12x6 400 12x8 550 12x10 680 12x12 210 16x4 320 14x6 490 14x8 670 14x10 800 14x12 240 18x4 375 16x6 580 16x8 800 16x10 950 16x12 270 20x4 430 18x6 670. Insert ducts to your sketchup model with the engineering toolbox sketchup extension. A comprehensive duct layout indicating sizes, design airflows, pressure class, and routing of the duct system. Duct sizing and construction tables according to smacna pdf. Ductwork sizing, calculation and design for efficiency. Manual d hvac duct design and layout drawing service.
Residential duct sizing guide key points to remember when using this guide the sizing chart is designed for estimating the airflow in an average system. The model applies to system up to 60 feet from unit to register. This manual provides the hvac system designer detailed information on duct design and u. Dont kill your air flow with this flex duct disease. Full worked example included with cfd simulations to optimise your design to ensure the highest energy efficiency. New duct sizing chart purchase your hvac equipment.
The basic principles of duct design, part 1 energy vanguard. Free ductwork tables for sizing and construction of hvac air ducts. Today we use all that to find out how big the ducts need to be. Total pressure total pressure measures the total energy of the air in a duct fig 3 similar to the way watts measures the. Home software download mcquay duct sizer for hvac duct sizing download mcquay duct sizer for hvac duct sizing 10302016 01.
Duct design clicking on a companys name will take you to their web site. A proper hvac duct sizing will guarantee that your. This will provide the knowledge necessary to recognize possible design errors and understand the effects of various design decisions. Equipment sizing load blower cfm equipment sizing load btuhour 1. Design cfm 4 cfm 6 cfm 8 cfm 10 cfm 12 60 6x4 60 4x6 90 4x8 120 4x10 150 4x12 90 8x4 110 6x6 160 6x8 215 6x10 270 6x12 120 10x4 160 8x6 230 8x8 310 8x10 400 8x12 150 12x4 215 10x6 310 10x8 430 10x10 550 10x12 180 14x4 270 12x6 400 12x8 550 12x10 680 12x12 210 16x4 320 14x6 490 14x8 670 14x10 800 14x12 240 18x4 375 16x6 580 16x8 800 16x10 950 16x12 270 20x4 430 18x6 670 18x8 930 18x10 1100. Studies show that hvac air duct systems are one of the major electrical energy consumers in industrial and com. The ashraefundamentals handbook contains hvac design criteria for most countries around the world. Duct sizing, duct calculation, duct design, energy efficient ductwork design. Heat conduction and thermal resistance for steady state conditions and one dimensional heat transfer, the heat q conducted through a plane wall is given by. Philadelphia, pa piedmont, sc indianapolis, in southaven, ms fremont, ne caldwell, id. This method requires many computations, which makes noncost optimizing techniques more attractive. Small ducts 66 design velocity 66 maximum velocity 67 sizing high pressure ducts 68 return air ducts hvac. Includes different duct types and both major unit systems. Duct designer streamlines duct design and improves calculation precision, letting you optimize your designs.
The fourth edition of hvac systems duct design presents the basic methods and procedures required to design hvac air distribution systems. This 3hour hvac training online video series provides guidance on how to properly use a friction chart andor accas duct slide rule values for sizing duct in the field. Larger volumes or higher static pressures should be. Hvac ducting principles and fundamentals 2012 instructor. Residential duct sizing guide the following duct sizes are based on a fraction drop of. Figure 3 is a sketch of an air conditioning cycle plotted on a psychrometric chart. Rightsizing of an hvac system involves the selection of equipment and the design of the air distribution system to meet the accurate predicted heating and cooling loads of the house.
Duct system sizes and airflow quick chart created date. A new ductsizing calculator from ashrae and the air distribution institute adi allows hvac airdistributionsystem designers to size ducts more accurately, especially flex ducts under varying amounts of compression, based on research results the duct size calculator is a quick reference tool for approximating duct size and equivalent sizes of sheetmetal duct and flexible duct. Over sizing systems cost more and does not maintain the desired air flow and undersized duct work causes the system to strain mechanically and can be noisy. In addition to the basic engineering guidelines for the sizing of hvac ductwork systems, the. The chart assumes the blower motor and total effective length of the duct system to be adequate for a. A preliminary duct layout can be compiled as in figure 2 with each duct numbered, and showing the volumes required in each room. To this point in our little series on duct design, weve been calculating intermediate quantitites. Ducts conforming to nfpa 90a or 90b shall meet the following requirements. The course concludes with the basic instructions for filling out a manual d speedsheet. Fibrous glass insulated hvac duct systems 3 sheet metal ducts lined with fibrous glass insulation fibrous glass duct liner insulation is designed for application to the interiors of commercial and residential sheet metal heating, ventilating, and airconditioning ducts to attenuate noise generated by central air handling. Design of flexibleduct junction boxes current standards ashrae 2012 hvac systems and equipment, box plenum systems using flexible duct constrains box width to 23x entrance width constrains box length to 2 x box width flat pressure loss 0.
Hvac essentials series air distribution course ss105 version 2 2012 hvac learning solutions page 6 of 44 1. Were following the manual d protocol for duct design, a standard developed by the air conditioning contractors of america acca. Residential main supply trunk ducts, nonzoned systems. Put your presentation title or confidentiality info here. Handbook of heating, ventilation and air conditioning. Pdf hvac calculations and duct sizing suryaprakash. Ansismacna 0062006 hvac duct construction standards. Ordinary heating, ventilating, and air conditioning duct systems read air pressures at 0. Duct system design guide first edition 2003 mcgill airflow corporation mcgill airflow corporation one mission park groveport, ohio 43125 duct system design. Ductsizing table construct a table, like table 4, showing the volume and assigned velocity for each duct, with the duct diameter selected from a ductsizing chart such as table 5. Rightsizing the hvac system begins with an accurate. Consequently, the total pressure or total energy of air. Another important factor in the installation process is to make sure the duct work is sized properly. Duct design quick introduction duct sizing tools and methods recommended duct velocities and noise effects duct fitting pressure losses do and donts of duct design duct applications as 4254.