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Relationship between the concentrations of PM2.5 indoors obtained by using the optical and gravimetric methods: preliminary analysis

Pastuszka Józef S.

Architecture Civil Engineering Environment

2020

Vol. 13, no. 4

105--113

The paper presents preliminary analysis of measurements of the mass concentrations of PM2.5 in the indoor environment, obtained with the use of two optical instruments: (Grimm device and low-cost sensor) and a sampler based on the gravimetric method (SKC). It was found that the measurement of PM2.5 using an optical device with active sampling underestimates the actual mass concentration of this mode (PM2.5), while measurement using an optical device with passive sampling of air overestimates the concentration of PM2.5. It has been shown that the physical relationship between the mass concentrations of airborne particles obtained with an optical sensor (Csensor) and concentrations obtained with the gravimetric method (Cgrav) is not linear. However, for practical reasons, the correct (“true”) concentration levels of PM2.5 in an indoor environment can be estimated by converting sensor data according to a simple linear equation, i.e., Cgrav = a Csensor. The coefficient a for the sensor used was estimated at 0.45.

Wpływ stężenia masy w młynie tarczowym na pobór mocy i wytrzymałość papieru

Mroziński A.

Inżynieria i Aparatura Chemiczna

2005

Nr 1-2

73-74

W artykule przedstawiono zagadnienie wpływu stężenia masy pa-pierniczo-makulaturowej na właściwości wytrzymałościowe otrzymywanego papieru oraz pobór mocy przez urządzenie mielące. Badania przeprowadzono w warunkach przemysłowych w młynie tarczowym ST300S.

In the paper a problem of waste-paper consistency influence on the strength properties of received paper and power consumption by a refining device was presented. Investigations were carried out in industrial conditions on the disc refiner ST300S.