Comparison of capture efficiency of pollutants over a workbench with traditional and reinforced slot exhaust systems

Comparison of capture efficiency of pollutants over a workbench with traditional and reinforced slot exhaust systems

abstract

en

The paper deals with the comparison of the capture efficiency of pollutants over a workbench with traditional and reinforced slot exhaust systems. The reinforced exhaust system is based on the combination of the air exhaust and the radial air supply which enlarges the exhaust area. The reinforced exhaust system can be configured in different ways. The paper compares the capture efficiency of the exhaust hoods with the same air velocity in the suction slot and with different momentum flux ratios of the supplied and exhaust air flow. In order to measure the capture efficiency of pollutants, the tracer gas method is used. This method is based on supplying a suitable gas to the space in front of the exhaust hood and measuring its concentration in the exhausted air with the multi-gas monitor. As the tracer gas the carbon dioxide was chosen. From the measured concentration of the tracer gas in the exhaust pipe, the capture efficiency of the investigated system with the traditional and reinforced exhaust system is calculated. Knowledge of the shape and the range of the effective exhausting area is important for the exhaust hood setting according to a source of pollutants.

The paper deals with the comparison of the capture efficiency of pollutants over a workbench with traditional and reinforced slot exhaust systems. The reinforced exhaust system is based on the combination of the air exhaust and the radial air supply which enlarges the exhaust area. The reinforced exhaust system can be configured in different ways. The paper compares the capture efficiency of the exhaust hoods with the same air velocity in the suction slot and with different momentum flux ratios of the supplied and exhaust air flow. In order to measure the capture efficiency of pollutants, the tracer gas method is used. This method is based on supplying a suitable gas to the space in front of the exhaust hood and measuring its concentration in the exhausted air with the multi-gas monitor. As the tracer gas the carbon dioxide was chosen. From the measured concentration of the tracer gas in the exhaust pipe, the capture efficiency of the investigated system with the traditional and reinforced exhaust system is calculated. Knowledge of the shape and the range of the effective exhausting area is important for the exhaust hood setting according to a source of pollutants.

The paper deals with the comparison of the capture efficiency of pollutants over a workbench with traditional and reinforced slot exhaust systems. The reinforced exhaust system is based on the combination of the air exhaust and the radial air supply which enlarges the exhaust area. The reinforced exhaust system can be configured in different ways. The paper compares the capture efficiency of the exhaust hoods with the same air velocity in the suction slot and with different momentum flux ratios of the supplied and exhaust air flow. In order to measure the capture efficiency of pollutants, the tracer gas method is used. This method is based on supplying a suitable gas to the space in front of the exhaust hood and measuring its concentration in the exhausted air with the multi-gas monitor. As the tracer gas the carbon dioxide was chosen. From the measured concentration of the tracer gas in the exhaust pipe, the capture efficiency of the investigated system with the traditional and reinforced exhaust system is calculated. Knowledge of the shape and the range of the effective exhausting area is important for the exhaust hood setting according to a source of pollutants.

Industrial ventilation, REEXS, slot exhaust hood, tracer gas method, capture efficiency.

Industrial ventilation, REEXS, slot exhaust hood, tracer gas method, capture efficiency.

17.09.2012

Paris, France

Ventilation 2012 - The 10th International Conference on Industrial Ventilation

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84–84

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