The Experts below are selected from a list of 2286 Experts worldwide ranked by ideXlab platform
Renaud Piarroux - One of the best experts on this subject based on the ideXlab platform.
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Comparison of Air Impaction and Electrostatic Dust Collector Sampling Methods to Assess Airborne Fungal Contamination in Public Buildings A BSTR ACT
Annals of Occupational Hygiene, 2016Co-Authors: Anne-cécile Normand, Stéphane Ranque, Carole Cassagne, Jean Gaudart, Kankoé Sallah, Denis-andré Charpin, Renaud PiarrouxAbstract:Many ailments can be linked to exposure to indoor airborne fungus. However, obtaining a precise measurement of airborne fungal levels is complicated partly due to indoor air fluctuations and non-standardized techniques. Electrostatic Dust Collector (EDC) sampling devices have been used to measure a wide range of airborne analytes, including endotoxins, allergens, β-glucans, and microbial DNA in various indoor environments. In contrast, viable mold contamination has only been assessed in highly contaminated environments such as farms and archive buildings. This study aimed to assess the use of EDCs, compared with repeated air-impactor measurements, to assess airborne viable fungal flora in moderately contaminated indoor environments. Indoor airborne fungal flora was cultured from EDCs and daily air-impaction samples collected in an office building and a daycare center. The quantitative fungal measurements obtained using a single EDC significantly correlated with the cumulative measurement of nine daily air impactions. Both methods enabled the assessment of fungal exposure, although a few differences were observed between the detected fungal species and the relative quantity of each species. EDCs were also used over a 32-month period to monitor indoor airborne fungal flora in a hospital office building, which enabled us to assess the impact of outdoor events (e.g. ground excavations) on the fungal flora levels on the indoor environment. In conclusion , EDC-based measurements provided a relatively accurate profile of the viable airborne flora present during a sampling period. In particular, EDCs provided a more representative assessment of fungal levels compared with single air-impactor sampling. The EDC technique is also simpler than performing repetitive air-impaction measures over the course of several consecutive days. EDC is a versatile tool for collecting airborne samples and was efficient for measuring mold levels in indoor environments.
Se-jin Yook - One of the best experts on this subject based on the ideXlab platform.
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Enhancement of louver Dust Collector efficiency using modified Dust container
Powder Technology, 2018Co-Authors: Jung Bo Sim, Un Hak Yeo, Gwang Hun Jung, Su-beom Park, Gwi-nam Bae, Se-jin YookAbstract:External air injected into a gas turbine contains many solid particles, which can reduce the performance and life of the turbine. In this study, a louver Dust Collector, which is a type of inertial Dust Collector, was used to remove solid particles from air, and the shape of the Dust container, which is part of the louver Dust Collector, was modified to improve Dust collection efficiency. As existing Dust containers have a structure for isolating particles, the inflow of the air into the Dust containers is limited and effective removal of particles is difficult. In this study, slits were drilled in the Dust container, baffle plates were used, and raised spots were added to improve particle collection efficiency through improved air flow in the Dust container and increased inertia effect of the particles. The trajectory of the particles and the collection efficiency for each Dust container shape were predicted using numerical analysis and the numerical analysis results were verified using a wind tunnel test. Results indicate that for an air flow rate of 3 m3/min, the collection efficiencies of the louver Dust Collectors with the one-slit model Dust container and two-slit model Dust container improved by 40.1% and 43.5%, respectively compared with that of the louver Dust Collector with the existing Dust container. Furthermore, for an air flow rate of 6 m3/min, the collection efficiencies of the louver Dust Collectors with the one-slit model Dust container and two-slit model Dust container improved by 32.9% and 37.6%, respectively, compared with that of the louver Dust Collector with the existing Dust container. Therefore, it is expected that the particle collection efficiency of the existing louver Dust Collector can be effectively increased by utilizing the shape of the Dust container proposed in this study.
Anne-cécile Normand - One of the best experts on this subject based on the ideXlab platform.
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Comparison of Air Impaction and Electrostatic Dust Collector Sampling Methods to Assess Airborne Fungal Contamination in Public Buildings A BSTR ACT
Annals of Occupational Hygiene, 2016Co-Authors: Anne-cécile Normand, Stéphane Ranque, Carole Cassagne, Jean Gaudart, Kankoé Sallah, Denis-andré Charpin, Renaud PiarrouxAbstract:Many ailments can be linked to exposure to indoor airborne fungus. However, obtaining a precise measurement of airborne fungal levels is complicated partly due to indoor air fluctuations and non-standardized techniques. Electrostatic Dust Collector (EDC) sampling devices have been used to measure a wide range of airborne analytes, including endotoxins, allergens, β-glucans, and microbial DNA in various indoor environments. In contrast, viable mold contamination has only been assessed in highly contaminated environments such as farms and archive buildings. This study aimed to assess the use of EDCs, compared with repeated air-impactor measurements, to assess airborne viable fungal flora in moderately contaminated indoor environments. Indoor airborne fungal flora was cultured from EDCs and daily air-impaction samples collected in an office building and a daycare center. The quantitative fungal measurements obtained using a single EDC significantly correlated with the cumulative measurement of nine daily air impactions. Both methods enabled the assessment of fungal exposure, although a few differences were observed between the detected fungal species and the relative quantity of each species. EDCs were also used over a 32-month period to monitor indoor airborne fungal flora in a hospital office building, which enabled us to assess the impact of outdoor events (e.g. ground excavations) on the fungal flora levels on the indoor environment. In conclusion , EDC-based measurements provided a relatively accurate profile of the viable airborne flora present during a sampling period. In particular, EDCs provided a more representative assessment of fungal levels compared with single air-impactor sampling. The EDC technique is also simpler than performing repetitive air-impaction measures over the course of several consecutive days. EDC is a versatile tool for collecting airborne samples and was efficient for measuring mold levels in indoor environments.
Wu Jun - One of the best experts on this subject based on the ideXlab platform.
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waste heat recovery system capable of improving efficiency of electric Dust Collector
2012Co-Authors: Cheng Xiangrong, Wu JunAbstract:The utility model discloses a waste heat recovery system capable of improving the efficiency of an electric Dust Collector, and belongs to the technical field of flue gas waste heat recovery systems in thermal power plants and the like. The waste heat recovery system comprises a high-temperature flue gas pretreatment device, an air preheater, an electric Dust Collector, a desulfurization system and a chimney which are connected in sequence, wherein a waste heat recovery device is arranged between the air preheater and the electric Dust Collector in a matching manner and comprises a shell and a heat exchange tube bundle which is arranged in the shell in the matching manner, the heat exchange tube bundle is a spiral finned tube, a liquid inlet I is arranged at one end of the spiral finned tube, and a liquid outlet I is arranged at the other end of the spiral finned tube. The waste heat recovery system is obtained by adopting the technology above, has a simple integral structure and a self-ash-cleaning function, is good in heat exchange effect, prevent ash accumulation, the temperature of flue gas is reduced to be at 90-110 DEG C from 130-180 DEG C, the water temperature is increased to be at 70-100 DEG C from 40-70 DEG C, the volume of flue gas entering the electric Dust Collector is reduced, the flow velocity of the flue gas is reduced, the efficiency of the electric Dust Collector can be effectively improved, and the emission requirements of new standards can be achieved.
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waste heat recovery system for improving efficiency of electric Dust Collector
2012Co-Authors: Xiangrong Cheng, Wu JunAbstract:The invention discloses a waste heat recovery system for improving the efficiency of an electric Dust Collector, belonging to the technical field of a flue gas waste heat recovery system of a thermal power plant and the like. The system comprises a high-temperature flue gas pretreatment device, an air preheater, an electric Dust Collector, a desulfurization system and a chimney which are connected sequentially, wherein a waste heat recovery device is cooperatively arranged between the air preheater and the electric Dust Collector; the waste heat recovery device comprises a shell and a heat exchange tube bundle cooperatively arranged in the shell; the heat exchange tube bundle is a spiral finned tube; and a liquid inlet I is arranged at one end of the heat exchange tube bundle, and a liquid outlet I is arranged at the other end. The waste heat recovery system disclosed by the invention has a simple overall structure, a self-Dust cleaning function and a good heat exchange effect, and prevents Dust accumulation; the temperature of the flue gas is reduced from 130-180 DEG C to 90-110 DEG C, and the water temperature is increased from 40-70 DEG C to 70-100 DEG C; and moreover, the volume of the flue gas entering the electric Dust Collector is reduced, the flow velocity of the flue gas is reduced, the efficiency of the electric Dust Collector can be effectively improved, and the discharge requirement of the new standard is met.
Kankoé Sallah - One of the best experts on this subject based on the ideXlab platform.
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Comparison of Air Impaction and Electrostatic Dust Collector Sampling Methods to Assess Airborne Fungal Contamination in Public Buildings A BSTR ACT
Annals of Occupational Hygiene, 2016Co-Authors: Anne-cécile Normand, Stéphane Ranque, Carole Cassagne, Jean Gaudart, Kankoé Sallah, Denis-andré Charpin, Renaud PiarrouxAbstract:Many ailments can be linked to exposure to indoor airborne fungus. However, obtaining a precise measurement of airborne fungal levels is complicated partly due to indoor air fluctuations and non-standardized techniques. Electrostatic Dust Collector (EDC) sampling devices have been used to measure a wide range of airborne analytes, including endotoxins, allergens, β-glucans, and microbial DNA in various indoor environments. In contrast, viable mold contamination has only been assessed in highly contaminated environments such as farms and archive buildings. This study aimed to assess the use of EDCs, compared with repeated air-impactor measurements, to assess airborne viable fungal flora in moderately contaminated indoor environments. Indoor airborne fungal flora was cultured from EDCs and daily air-impaction samples collected in an office building and a daycare center. The quantitative fungal measurements obtained using a single EDC significantly correlated with the cumulative measurement of nine daily air impactions. Both methods enabled the assessment of fungal exposure, although a few differences were observed between the detected fungal species and the relative quantity of each species. EDCs were also used over a 32-month period to monitor indoor airborne fungal flora in a hospital office building, which enabled us to assess the impact of outdoor events (e.g. ground excavations) on the fungal flora levels on the indoor environment. In conclusion , EDC-based measurements provided a relatively accurate profile of the viable airborne flora present during a sampling period. In particular, EDCs provided a more representative assessment of fungal levels compared with single air-impactor sampling. The EDC technique is also simpler than performing repetitive air-impaction measures over the course of several consecutive days. EDC is a versatile tool for collecting airborne samples and was efficient for measuring mold levels in indoor environments.
