Ill follow that up with articles on the process we use in designing duct systems, including available static pressure, equivalent length, and. Ductwork installation and product guide fordustcollection systems. This course will discuss the basic fundamentals and principles of air conditioning duct design and layout. Ordinary heating, ventilating, and air conditioning duct systems read air pressures at 0. Ansismacna 0062006 hvac duct construction standards.
The smacna logo the smacna logo is registered as a membership identification mark. Download one of the free kindle apps to start reading kindle books on your smartphone, tablet, and. Below is a simple model for determining duct sizes. This involves return air unconditioned coming into the heatingcooling system. Smacna standards and manuals are developed by smacna contractors and the building trade association, and suitably address all facets of the sheet metal industry. Tests and leakage requirements are the same as for medium pressure ductwork except test at an air pressure of 2 inches 50 mm of water. Complete system design includes our step by step diy air duct installation dvd. Losses compare favorably with elbows with double wall turning vanes in several cases. Table 15 weight of steel duct per foot of length 75 lbft3 particulate plus 5 lbft2 superimposed load lb table 15m weight of steel duct per meter of length 1200 kgm3 particulate plus 7. The sheet metal and air conditioning contractors national association smacna has published the second edition of its rectangular industrial duct construction standards. Due to covid19, we are taking precautions to protect our staff that may result in delays in publications store order shipments. Target range for zone heating loads in ducting designs with equal.
Zoning duct design guide for mechanical system designers. Crimped joint connection length changed from 1 to 2 rectangular branch taps into round added for straight or 45 degree leadinentry 15. Several issues must be considered in an effective design. The basic principles of duct design, part 1 energy vanguard. We apologize for this potential inconvenience and thank you for your consideration during this difficult time for all. This book presents a global approach to the design of efficient air duct systems and is available in both a printed version and an electronic version on cdrom. The types of fittings to be used based on the designers calculations of fitting losses i. Duct system calculator this calculator, complete with detailed instructions, enables hvac system designers to design an average duct system without additional references. Sheet metal and air conditioning contractors national. As a fullservice design, build and install contractor, ivi, inc. Learn more about fundamentals of air system design at.
Apparent differences of about ten percent between fan delivery and sum of airflow measurements at terminals do not necessarily mean poor sealing and excess leakage. Code changes for duct system standards you should know. Smacna s mission is to provide products, services, and representation to enhance members businesses, markets, and profitability. Smacna hvac duct construction standards contains all the construction standards for duct construction including rerated rectangular, round, oval and flexible duct constructions for positive or negative pressures up to 10 inches water gage 2500 pa. Possessionofmembership anduseofthe logo in no way constitutes or reflects smacnaapproval ofany product, method, orcomponent. Ducts are conduits or passages used in heating, ventilation, and air conditioning hvac to. Major changes from first editionround, flexible and oval duct revisions duct pressure classes revised to be positive and negative at 2, 4 and 10 w. The sheet metal and air conditioning contractors national association smacna recently published duct cleanliness for new construction guidelines.
The first type of system is referred to as a positive pressure or supply air system, and the second type as a negative pressure, exhaust, or return air system. Ductwork installation and product guide fordustcollection. Jun 09, 2010 smacna architectural sheet metal manual, 7th edition smacna. Architectural sheet metal standards architectural cadd drawings business management design guides hvac duct construction standards indoor environmental air quality industrial duct construction standards inspection manuals residential standards safety seismic hazard standards. Related searches for duct design for dummies howto help and videos for dummies. Freshaire uv uvgi system design guide continued target optimal technology bacteria, viruses, fungi uvc lamps, induct. Utilize other duct design methods such as low velocities, directional changes, etc. Planning laying out, sizing, optimizing, detailing, and finding the pressure losses through a duct system is called duct design. Smacna architectural sheet metal manual, 7th edition by. Duct design manual is intended to be used in conjunction with the american society of heating, refrigerating and air conditioning engineers, inc.
The current 2014 state of the art for air leakage in ductwork. Ductwork installation and product guide fordustcollection systems installation and design guide product and price list order form this guide is limited to penn state industriesline of metal ductwork. The standard contains tables and details for constructing ductwork for. Cleanliness for ducts detailed in new smacna guidelines. The purpose of residential ductwork design is to properly distribute the airflow, produced by your heatingcooling system, to your house. Contains guidelines for inspection of commercial hvac duct systems for compliance with smacna ansi hvac duct construction standards, metal and flexible, 3rd edition and fibrous glass duct construction standards 7th edition. An actual duct design problem duct design procedures, building and system, and working through the problem. The pressure loss between two points in a duct system that are separated by a. This book is a good source for determining all the design needs for hvac systems from calculating the heating cooling load to duct design and fan selection which is essential to assure an economical, energyefficient, maintainable and flex design that will only not be technically adequate but also meet the user within the allocated budget.
This is reflected in the latest revisions of the following ashrae handbooks and standards. A complete line of dust collection equipment is available in our full catalog. Hvac duct construction standards metal and flexible, 3rd edition. Online shopping from a great selection at books store. I have an r1 use group, four stories in height, type va construction, fully sprinklered. Source book for efficient air duct systems in europe inive.
Smacna technical manuals pmsmca plumbing mechanical sheet. Smacna hvac duct systems inspection guide, 3rd edition 2006. Total pressure, velocity pressure, and static pressure. The basic fluid flow equations are not included here, but may be found in the ashrae handbook. The current 2014 state of the art for air leakage in ductwork over the last five years there has been a major shift in the way ashrae has approached air leakage in ductwork. The average irradiance for a typical air duct application should range from 1,000 to 10,000 wcm2 depending on the microbe to be inactivated and operating conditions such as air temperature, air velocity, and humidity. Analyzing the highlevel apis of the most widely used ml frameworks such as tensorflow, pytorch, keras, gluon, chainer, and onnx, itas easy to recognize that the dominance of the python language is overwhelming. A primary issue is the tradeoff between the initial cost of the duct system and the energy cost of the air distribution system. Smacna hvac duct construction standards metal and flexible, 3rd ed. Where fittings of configurations not shown in the hvacdcs are shown on the contract drawings, they shall be constructed as though they were therein. Fashion design for dummies interior design for dummies books dummies for sale web design for dummies book 1 2 ad related to duct design for dummies expert ductwork design. A number of duct fittings are used to illustrate airflow movement variations through a duct system.
We present two methods for sizing the network for the transport of the air, from. Test one representative low pressure supply air duct section on each floor consisting of ductwork between the terminal reheat coil, or vav terminal and the outlets. Duct systems are designed to properly distribute air throughout a building. It is intended to help commercial duct installation contractors, engineers and building owners towards achieving a clean, full. The fourth edition of hvac systems duct design presents the basic methods and procedures required to design hvac air distribution systems. In addition to the basic engineering guidelines for the sizing of hvac ductwork systems, the manual also provides related information on economics of duct systems, duct system layout, pressure losses, fan selection, duct leakage, acoustic considerations, and testing, adjusting and balancing tab. Book by sheet metal and air conditioning contractors national association, 2006. Smacna duct design manual hvacr engineering engtips. Installation of ductwork should comply with smacna hvac duct construction. Book by sheet metal and air conditioning contractors national association, 2005. A comprehensive duct layout indicating sizes, design airflows, pressure class, and routing of the duct system. The third edition of the hvac duct construction standards metal and flexible is intended primarily for commercial and institutional duct construction. Smacnas mission is to provide products, services, and representation to enhance members businesses, markets, and profitability.
Ductwork taps shall be conical or clinch collar with 45 degree or boot connections. The only calculator in the industry to include the 0. The hvac air duct leakage test manual provides practical and detailed procedures for conducting leakage tests. Design guide for heating, ventilating, and air conditioning systems. The velocity of supply air as it leaves the supply outlet. Contains guidelines for inspection of commercial hvac duct systems for compliance with smacnaansi hvac duct construction standards, metal and flexible, 3rd edition and. Smacna architectural sheet metal manual, 7th edition smacna. The association prescribes acceptable use of the logo and expresslyforbidstheuseofittorepresentanythingotherthanpossessionofmembership. Duct flow news newspapers books scholar jstor july 2009 learn how and. The smacna hvac system duct design manual offers new loss coefficients for elbows with 45degree throats on square and radius heels and radius throats with square heels. Duct sound liner that is directly exposed to the air stream shall not to be used, except in exceptional circumstances and only with the permission of the um design manager. This manual provides the hvac system designer detailed information on duct design and u. They want to use a subduct system for the exhaust fans serving the bathrooms and eliminate the need for fire and smoke dampers at the shaft penetration. Choosing the rightsized duct is critical to maintain proper air flow in the system.
Potential accuracy of flow measurements should be evaluated. Smacna hvac duct systems inspection guide, 3rd edition. Then, by heatingcooling that air, delivering the newly conditioned air to your home. Contains guidelines for inspection of commercial hvac duct systems for compliance with smacnaansi hvac duct construction standards, metal and flexible, 3rd edition and fibrous glass duct construction standards 7th edition. Provide balancing dampers at supply, return, and general exhaust branches when connected to larger ducts, as required, for air balancing.
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