A multiple tracer gas technique for the measurement of airflow patterns in large industrial premises

Abstract This paper deals with a multiple tracer gas measurement system suitable for characterization of airflow patterns and ventilation effectiveness in large industrial premisesand commercial structures. The highly automated system consists of a multipoint sampling unit, an IR-analyzer and a microcomputer. Up to now, nitrous oxide, dichlorodifluoromethane and carbon dioxide have been used as tracers. The method was applied to study the distribution of the supplied air and the cleaned recirculated air in a finishing department of a steel foundry.