For a high wall jet inlet, simulations were performed for nine room air exhaust locations and eight source locations. For a ceiling diffuser inlet, the impact of two exhaust locations and eight source locations were investigated. The CFD approaches used were validated for internal consistency and agreement with scale-model chamber results. Because CFD treats determinants of contaminant transport explicitly and agreed well with experimental results, it was used as the standard for comparison. J. Formisano, Jr., M. Lippmann, NYU Medical Center, Tuxedo, NY Data comprising individual worker exposures are used to determine compliance with workplace standards, but they are subsequently warehoused and rarely used again.
Investigation indicates that the work can be divided into two types of tasks.
Ordinal logistic regression for variables selected for Area A show that task and local ventilation are significant, while shop is not. The large difference in probability noted between these two tasks, and two levels of ventilation, validate this method for predicting probability of membership in other categories defining worker exposure values. To understand disease causality and the effectiveness of workplace environmental controls, epidemiology studies have historically relied on the association of groups of workers to employment in an industry or job and the duration of that association. Effectively, the occupational hygienist played a minor role in such work since quantitative data did not anchor the conclusions of the studies. Today, occupational hygienists are being asked to characterize exposure environments for which there are no data, where essential data might be missing, or where the only data form an analogous environment.