A Demonstration of NIOSH Push-Pull Ventilation Criteria

Klein, M.

doi:10.1202/0002-8894(1987)048<0238:adonpv>2.0.co;2

Cited by 1 publication

(2 citation statements)

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“…For circular nozzles, the trajectory of a horizontally projected non-isothermal free air jet could be represented by equation (8), according to Koestel 30 :…”

Section: Trajectory Of the Hot Jetsmentioning

confidence: 99%

“…[3][4][5] In 1982 and 1985, Huebner and Hughes 6,7 provided some empirical values for supply air velocity and suction velocity for different surface treatment tanks using theoretical analysis and experiments. Klein 8 and Matthew 9 applied Huebner and Hughes's achievements to practical industries and corrected the supply air velocities and suction velocities for some special conditions. Since the 1990s, the airflow characteristics of surface treatment tanks with pushpull ventilation systems 10,11 have received attention from studies of computational fluid dynamics (CFD).…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on one-side confined jets from a parallel-flow outlet in a push–pull ventilation system

Wang

Huang

Zhou

et al. 2013

Indoor and Built Environment

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This study conducted a series of experiments on the airflow characteristics of one-side confined jets from a parallel-flow outlet with a two-tier perforated plate and a honeycomb in a push–pull ventilation system. Maximum velocity, maximum temperature and airflow trajectory were analysed and compared with previous studies about different outlets. The results showed that the dimensionless turbulence coefficient of the parallel-flow outlet was smaller than either the cased axial fan with open grille’s or the swirl diffuser’s turbulence coefficients from isothermal condition. Different development laws for the parallel-flow outlet discharging a hot air jet (Ar0 = 0.024) on the floor were put forward. Furthermore, it was found that the velocity decay rate of the hot air jets with a parallel-flow outlet on the floor was slower than with the circular aperture over a flat surface. When Ar0 ranged from 0.024 to 0.044, a semi-empirical equation was established to describe the trajectory of the hot jets from a parallel-flow outlet in a push–pull ventilation system. In addition, the baffle height of the suction outlet could be determined and corrected appropriately.

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“…For circular nozzles, the trajectory of a horizontally projected non-isothermal free air jet could be represented by equation (8), according to Koestel 30 :…”

Section: Trajectory Of the Hot Jetsmentioning

confidence: 99%