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Measurement And Analysis Of Vitiation Of Secondary Air In Air Distribution Systems (Rp-1276), David P. Yuill, Grenville K. Yuill, Andrew H. Coward
Measurement And Analysis Of Vitiation Of Secondary Air In Air Distribution Systems (Rp-1276), David P. Yuill, Grenville K. Yuill, Andrew H. Coward
David Yuill
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, Er, 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 Er, and shows the results of the first …