ILO Home
Go to the home page
Site map | Contact us Franšais | Espa˝ol

CISDOC database

Document ID (ISN)64203
CIS number 95-715
ISSN - Serial title 0002-8894 - American Industrial Hygiene Association Journal
Year 1994
Convention or series no.
Author(s) Olcerst R.
Title Measurement of outdoor and recirculated air percentages by carbon dioxide tracer
Bibliographic information June 1994, Vol.55, No.6, p.525-528. Illus. 4 ref.
Abstract This article presents a technique to extend the utility of carbon dioxide dataloggers in the provision of information on the percentages of both outside air and recirculated air in a ventilated compartment. An electronic timed sampling valve is used to alternately collect air from the room supply and from the recirculated airstream. The timed valve provides a dataset for each location that can be used to calculate the percentages of outside and recirculated air. The technique uses ambient carbon dioxide as a natural tracer gas. The carbon dioxide tracer technique can be used when the psychrometric temperature method for calculating outside air percentage is indeterminate because the return air and outdoor air temperatures are equal.
Descriptors (primary) ventilation; microclimate; evaluation of technique; ventilation systems
Descriptors (secondary) description of technique
Document type D - Periodical articles
Country / State or ProvinceUSA
Subject(s) Heating, ventilation and climate
Broad subject area(s) Physical hazards
Browse category(ies) Ventilation