javascript code 39 barcode generator Figure 542 Typical mixing-box con gurations in Software

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Figure 542 Typical mixing-box con gurations
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Design Procedures: Part 3 142 Five
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Figure 543 Mechanical air mixer (Air Blender , courtesy of Blender Products, Inc)
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A sure way to eliminate strati cation is by means of a mechanical mixer (Fig 543), which imparts rotation and turbulence to the airstream, or by means of propeller fans, which are mounted to blow across the duct or plenum, as in Fig 544 Note that good mixing is the result of turbulence which creates some energy loss in the airstream and increases the pressure requirement at the supply fan
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Figure 544 Using propeller fans for air mixing
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Design Procedures: Part 3 Design Procedures: Part 3 143
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Noise is generated in HVAC systems by motors and mechanical devices, principally fans and pumps, as well as by the airstream itself The subject of acoustics and noise control is discussed in Chap 20 511 Indoor Air Quality
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The issue of indoor air quality10 has taken on much signi cance in recent years as the effects of air quality on human health and even life safety have become better known There are many factors associated with air quality Concern is for airborne particulates and for gaseous contaminants; some may be introduced from the outside, but many are generated inside by habitation, by process, or by off-gassing of synthetic construction or furnishing materials Many of ce machines give off vapors or particulates which may offend the occupants In recent years, smoking has become a less common problem than it once was An extreme case of poor indoor air quality may lead to a facility being diagnosed as having sick building syndrome In such a case, occupants may object to odors or moisture levels, or may complain of irritated air passageways, irritated eyes, dry, itching skin, workplace induced illness, etc Poor lighting sometimes exacerbates the perception of a poor air quality condition Traditionally, internally generated air contaminants in buildings have been diluted to within acceptable levels by the introduction of at least a percentage of outside air into a generally recirculating, ventilating air stream In the past when buildings were not so air tight, in ltration also helped to maintain an acceptable indoor environment In current practice, designers should regularly address the issues of indoor air quality in the building HVAC system design All HVAC systems should include capability for the introduction of some outdoor air, either in minimum quality based on occupancy (15 20 cfm/person) or based on direct measurement of a pollutant of concern, such as carbon dioxide (800 1000 ppm maximum) If ambient outdoor air poses its own problems, special ltration may be required Designers should become familiar with local conditions, expectations, and reasonable solutions The ASHRAE publication Ventilation for Acceptable Indoor Air Quality treats the subject in some detail, and offers different approaches for determining required ventilation rates for air quality The topic is not without controversy See Chap 21 512 Summary
In this chapter we discussed air transport systems and air distribution, including fans, ductwork, grilles, registers, diffusers, dampers, and lters Air-handling systems are discussed in Chap 11
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Design Procedures: Part 3 144 Five
References
1 Air Moving and Conditioning Association (AMCA), Inc, Standard 210-85, Laboratory Method of Testing Fans for Rating, 1985, Arlington Heights, IL 2 AMCA, No 201-90, AMCA Fan Application Manual, Fans and Systems, 1990 3 ASHRAE Handbook, 2001 Fundamentals, Chap 34, Duct Design 4 Sheet Metal and Air Conditioning Contractors National Association (SMACNA), Standards for Duct Construction, several volumes, 1985 to 2002, Vienna, VA 5 National Fire Protection Association, national re codes, several volumes, issued annually, Quincy, MA 6 J H Klote and James A Milke, Jr, Design of Smoke Management Systems, 1992 [available from ASHRAE / SFPE (Society of Fire Protection Engineers)], Atlanta, GA 7 ASHRAE, Standard 901-1999, Energy Conservation in New Building Design 8 ASHRAE Handbook, 1997 Fundamentals, Chap 32, Space Air Distribution 9 ASHRAE, Standard 521-1999, Method of Testing General Ventilation Air-Cleaning Devices for Removal Ef ciency by Particle Size 10 ASHRAE Proceedings, IAQ (Indoor Air Quality), Managing Indoor Air Quality for Health and Energy Conservation, 1986
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