Source book for efficient air duct systems in europe 1 introduction one aim of this source book is to increase hvac designer awareness of the important role the ductwork plays with respect to function, costs and energy use of the hvac system. Chapter layout and fabrication of sheet metal and. Explain how the acca manual j, s and d load calculation. No part of this work may be reproduced or used in any form or by any means graphic, electronic, or. Supply air ducting, designed for medium pressure and. University of california san francisco medical center design guidelines june 2015 4 section 23 hvac b. Consequently, the total pressure or total energy of air flowing in a duct system is generally equal to the sum of the static pressure and the velocity pressure. This information should be consulted to ensure that the proper type and location of duct system is selected for the structure in question. Related commercial resources chapter 35 duct design bernoulli. Duct design 81 introduction 81 pressure head and energy equation 82 friction loss analysis 87 dynamic losses 87 ductwork sectional losses 88 fan system interface 88 pressure changes system 89 duct system design 89 design considerations 812 duct design methods 8 duct design procedures 8 automated duct.
Fairey, iii nted at the affordable comfort conference 2001, april 30may 5, 2001, milwaukee, wi. The dallasfort worth international airport hereinafter referred to as dfw airport design criteria manual has been developed to ensure a unified approach to the design of the renovation of existing facilities or the construction of new facilities throughout the dfw airport complex. 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. Quick introduction a good duct design is a balance between. Fellow ashrae 0 f the three duct design procedures recommended by the 1997 ashrae handbookfundamentals, only the tmethod incorporates lifecycle cost. Deficiencies in duct design can result in systems that operate incorrectly or. Identify code requirements regarding sizing, design, and selection of hvac equipment and ducts. Measured performance and design guidelines for large. Duct design submitted in partial fulfillment of requiredment for the award of the degree of bachelor of technology in mechanical enginneering submitted by md zeeshan x01a0366 sandeep singh x01a0392 zafaryab haider x01a03c2 md. Identify the procedures associated with joining and installing sheet metal duct. Lowvelocity design will lead to larger duct sizes, but it may be worth since, doubling of duct diameter.
Highvelocity hv duct systems are characterized by air velocities in the range of 2500 to 3500 fpm. Smacna 0162012 english secure pdf hvac air duct leakage test manual, 2nd edition handbook manual guide published 2012 by sheet metal, allowable leakage based on smacna leakage class calculation of allowable leakage using leakage class is derived from smacna hvac air duct leakage test manual. The ventilation technical guide is designed to assist in both the management and execution of. One of the most signi cant studies for ducted propeller design was carried out by ryan and glover 3. Dynamics of propeller blade and duct loading on ventilated. Technical notes 19 residential fireplace design january 1993 abstract. 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. Leaktight laser welded seams, instead of lockform or spiral duct which badly leaks and allows debris harbors and snag opportunities. Installation of ductwork should comply with smacna hvac duct construction. Ordinary heating, ventilating, and air conditioning duct systems read air pressures at 0. Duct system sizing is a balance between first cost and energy cost.
Consult the duct layout and design manual for more specific information on duct sizing. The recommendations are limited to singleface fireplaces. Specifically, a larger duct is necessary for the 3660 or 4860 unit before splitting the flow or if the plenum length is more than 150 feet. On the noncritical runs duct sizing is only a balance between first cost and acoustical criteria. Sheet metal plenum design and installation instructions. The static regain principle and duct static pressure control. In addition to the basic engineering guidelines for the sizing of hvac ductwork systems, the. Immersion is referred to immersion of the propeller shaft centreline and is. This method requires many computations, which makes noncost optimizing techniques more attractive. No part of this work may be reproduced or used in any form or by any means graphic, electronic, or mechanical, including photocopying. 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. It also revealed that the issues often inherent with existing ductwork e. It is worth noting that the design of a space conditioning system is an iterative process.
Table 1 lists the maximum airflow for various round duct sizes. Small hvac system design guide new buildings institute. This manual provides the hvac system designer detailed information on duct design and u. Rules of duct design acca manual d residential duct systems. Principle of duct design in hvac systems cedengineering. The types of fittings to be used based on the designers calculations of fitting losses i. University of colorado boulder, co, usa overview system description secondary hvac systems air distribution room diffusers and air terminals duct design fan characteristics air handling units water distribution cooling coils pipes and pumps primary hvac systems electric chillers. Identify the different types of fiberglass duct systems. Source book for efficient air duct systems in europe. For residential air duct designs accas manual d is the procedure recognized by the american national standards institute ansi and specifically required by residential building codes. Design information designing your dust collection system.
Smacna cad standard second edition v notice to users of this publication 1. State the safety regulations associated with sheet metal and fiberglass duct systems. This technical notes covers the components, design and dimensions of residential woodburning fireplaces. Design guide for heating, ventilating, and air conditioning systems. Table 1 in accas manual j lists design con ditions for locations in the u. The fourth edition of hvac systems duct design presents the basic methods and procedures required to design hvac air distribution systems.
Whilst systems that are not noise critical can be simply sized using a. Are there multiplesized vehicles being serviced within the facility. Hvac design for cleanroom facilities ced engineering. To use portable air cleaners, furnace filters, or other ductmounted air cleaners to good effect, it is crucial to understand the difference between two parameters that influence the. Duct design fundamentals static pressure ps measure of the static energy of air flowing air which fills a balloon is a good example of static pressure equally exerted in all directions the atmospheric pressure of air is a static pressure 14. Manual dampers add series resistance to the flow and this resistance. Ansismacna 0062006 hvac duct construction standards. Good duct design as stated, good duct design involves sizing the ducts, determining the pressure losses, calculating the noise levels, determining the out of balance pressures and optimising this against the total cost of the system. The propeller was modeled by lifting line method, and duct and hub by axisymmetric surface vorticity method. 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. Identify the different types of sheet metal duct systems.
Consequently, the total pressure or total energy of air flowing in a duct system is generally equal to the sum of the static pressure and. Design the ductwork system page 14 calculate static pressure page 15. Lowvelocity ductwork design is very important for energy efficiency in air distribution systems. These systems are notorious for consuming more energy than is necessary to properly heat. Small hvac system design guide overview 1 overview this design guide focuses on packaged heating, ventilation and air conditioning hvac syst ems up to 10 tons per unitthe most common hvac systems for small commercial buildings in california. Designing your dust collection system there are five simple steps to designing an effective and efficient dust collection system. Facilities is the only detailed design requirements. It also has a section for specific operations that specifies volumetric flow rate, minimum duct velocity, and hood entry losses.
Design and construction of interior duct system report number. Duct system design guide first edition 2003 mcgill airflow corporation mcgill airflow corporation one mission park groveport, ohio 43125 duct system design i notice. Does the facility pr ovide dedicated service bays for cars, light trucks and. Compliance to the design manual, which promulgates minimum performance design standards for va owned and leased. Concepts for increased energy efficiency as a supplemental heating unit are also addressed. This 2017 va hvac design manual for the department of veterans affairs va healthcare facilities is the only detailed design requirements manual for va. The procedures of residential hvac design see figure 1 are covered in detail by a series of. This document is not a procedural stepbystep set of instructions on how to create a duct design. A comprehensive duct layout indicating sizes, design airflows, pressure class, and routing of the duct system. For rectangular duct sizes, size the duct for equal. Handbook of heating, ventilation and air conditioning. This 2017 va hvac design manual for the department of veterans affairs va healthcare. Smacnas hvac air duct leakage test manual 1985 to verify the intent of the.
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