This study assessed the effectiveness of commercially available local exhaust ventilation (LEV) systems for controlling respirable dust and crystalline silica exposures during concrete cutting and grinding activities. Work activities were performed by union-sponsored apprentices and included tuck-point grinding, surface grinding, paver block and brick cutting (masonry saw), and concrete block c...

OBJECTIVE Exposure to organophosphates (OP) may lead to a life threatening cholinergic crisis with death attributed to a rapidly progressive respiratory failure. In a toxicological mass casualty event involving organophosphate exposure, many of the victims may depend on immediate short-term ventilation to overcome the respiratory distress which may exhaust life supporting resources. In addition...

In railway tunnels, ventilation is carried out to prevent NO, NO2, and CO gas pollution caused by exhaust gases due the diesel locomotives on railway. Some calculations are used during ventilation. these calculations, factors like location structure of tunnel pressure belts that may occur should be considered one one. After control scenarios prepared based locations dimensions equipment used. P...

In the current paper, methods of calculating infiltration for different ways ventilation system operation have been reviewed. The calculation losses buildings in cases organizing natural and mechanical supply exhaust ventilation, as well recent scientific research this area, has considered. with values air exchange given Set Rules 54.13330.2016 “Residential multi-apartment buildings” compared t...

This article presents a case study of multiple confluents jets system in virtual chamber. In this study, it is obtained the behavior airflow an office, simulated by camera, whose ventilation horizontal confluent type. The has inlet consisting four vertical ducts mounted corners compartment. Each duct groups 32 nozzles, aligned and equally spaced, positioned from base close to floor. two nozzles...

Abstract Ventilation system affects the water evaporation rate, energy consumption and paper quality, which is considered as largest optimization potential part of multi-cylinder dryer section. In this paper, models section are constructed by combining modules moisture evaporation, heat recovery system, air heaters, supply exhaust air. Taking a corrugated machine an example, ventilation influen...