Air recirculation practices and research in Sweden.
The recirculation of industrial exhaust air: proceedings of a symposium, October 6-7, 1977, Cincinnati, Ohio. Cincinnati, OH: U.S. Department of Health, Education, and Welfare, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, DHEW (NIOSH) Publication No. 78-141, 1978 Apr; :129-137
Current Swedish practices and research on air recirculation were reviewed. Air recirculation practices, which were based partly on regulations for office buildings and partly on old regulations for hazardous dusts, were not specific for industrial air recirculation. In order to provide the basis for new, uniform regulations, the influence of different parameters on contaminant concentrations was being examined in an analytical model. The model included airflow rates, contaminant generation rates, hood capture efficiencies, and air cleaner efficiencies. Methods were also being designed, tested, and used for measuring hood capture efficiencies and for measuring air cleaner efficiencies for some industrial dusts. Distinctions and general requirements concerning central and local air recirculations systems were suggested and included the design of central systems by air conditioning engineers in cooperation with industrial hygienists, no limits for the proportion of recirculated air in relation to supply air in central systems versus limits in local systems, system bypass or shutoff, instructions for use and maintenance of systems, and a list to specify allowable versus nonallowable contaminants.
NIOSH-Contract; Contract-210-77-0056; Industrial-safety; Industrial-ventilation; Industrial-design; Exhaust-systems; Analytical-processes; Air-quality-monitoring; Industrial-environment; Analytical-models
The recirculation of industrial exhaust air: proceedings of a symposium, October 6-7, 1977, Cincinnati, Ohio