Measurement and analysis of vitiation of secondary air in air distribution systems (RP-1276).(Report): An article from: HVAC & R Research
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ISBN / ASINB002F1RAPU
ISBN-13978B002F1RAP9
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This digital document is an article from HVAC & R Research, published by American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc. on May 1, 2008. The length of the article is 4617 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available immediately after purchase. You can view it with any web browser.
From the author: Appendix A of ANSI/ASHRAE Standard 62.1-2007, Ventilation for Acceptable Indoor Air Quality, describes the recycling of unvitiated ventilation air in a recirculating air-handling system. Equation A-2 considers air delivered through the primary air path (central air distribution system) and secondary air paths, such as fan-powered boxes or transfer-air fans. It contains a variable, [E.sub.r], that describes the extent to which the secondary air comes from the zone in question, as opposed to coming from "average system return air." This paper describes the development of an equation that can be used to quantify [E.sub.r], and shows the results of the first experimental measurements of [E.sub.r]. For these measurements, tracer gas experiments were carried out on an office building in Omaha, Nebraska. The study showed that the theoretical range of [E.sub.r] is from zero to infinity. Its range in the test building is from 0.74 to 1.01 as built, but could range from 0.14 to 1.13 if the fan-powered boxes had been located in different, but realistic, locations. These findings contradict the standard, which defines [E.sub.r] as ranging from 0 to 1.
Citation Details
Title: Measurement and analysis of vitiation of secondary air in air distribution systems (RP-1276).(Report)
Author: David P. Yuill
Publication:HVAC & R Research (Magazine/Journal)
Date: May 1, 2008
Publisher: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc.
Volume: 14 Issue: 3 Page: 345(13)
Article Type: Report
Distributed by Gale, a part of Cengage Learning
From the author: Appendix A of ANSI/ASHRAE Standard 62.1-2007, Ventilation for Acceptable Indoor Air Quality, describes the recycling of unvitiated ventilation air in a recirculating air-handling system. Equation A-2 considers air delivered through the primary air path (central air distribution system) and secondary air paths, such as fan-powered boxes or transfer-air fans. It contains a variable, [E.sub.r], that describes the extent to which the secondary air comes from the zone in question, as opposed to coming from "average system return air." This paper describes the development of an equation that can be used to quantify [E.sub.r], and shows the results of the first experimental measurements of [E.sub.r]. For these measurements, tracer gas experiments were carried out on an office building in Omaha, Nebraska. The study showed that the theoretical range of [E.sub.r] is from zero to infinity. Its range in the test building is from 0.74 to 1.01 as built, but could range from 0.14 to 1.13 if the fan-powered boxes had been located in different, but realistic, locations. These findings contradict the standard, which defines [E.sub.r] as ranging from 0 to 1.
Citation Details
Title: Measurement and analysis of vitiation of secondary air in air distribution systems (RP-1276).(Report)
Author: David P. Yuill
Publication:HVAC & R Research (Magazine/Journal)
Date: May 1, 2008
Publisher: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc.
Volume: 14 Issue: 3 Page: 345(13)
Article Type: Report
Distributed by Gale, a part of Cengage Learning
