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Pawel Wargocki – One of the best experts on this subject based on the ideXlab platform.

  • EFFECT OF STREAMER PLASMA Air Purifier ON SBS SYMPTOMS AND PERFORMANCE OF OFFICE WORK
    7th International Symposium on Heating Ventilating and Air Conditioning Proceedings of Ishvac 2011 Vols I-Iv, 2011
    Co-Authors: X J Zhang, Pawel Wargocki, L. Fang, Daniel Szulc, T. Tanaka, Kenichi Kagawa
    Abstract:

    Subjective experiments were conducted to evaluate the effect of a streamer plasma Air Purifier on perceived Air quality, SBS symptoms and performance of office work during 5-hour exposure of 32 recruited subjects in field laboratory in which real materials were used to establishing a realistic level of Air pollution. Intensity of SBS symptoms were indicated using visual-analogue scales. Subjects’ performance was evaluated with several computer tasks. The results show that operation of the Air Purifiers improved perceived Air quality and reduced the odor intensity of indoor Air. Eye dryness symptom was found significantly improved when the Air Purifiers were used but no other SBS symptoms or performance of office work were improved when the Air Purifiers were in operation compared to the condition when they were off.

  • The effect of a photocatalytic Air Purifier on indoor Air quality quantified using different measuring methods
    Building and Environment, 2010
    Co-Authors: Barbara Kolarik, Pawel Wargocki, Anna Skorek-osikowska, Armin Wisthaler
    Abstract:

    Abstract The effect on indoor Air quality of an Air Purifier based on photocatalytic oxidation (PCO) was determined by different measuring techniques: sensory assessments of Air quality made by human subjects, Proton-Transfer-Reaction Mass Spectrometry (PTR-MS) and chromatographic methods (Gas Chromatography/Mass Spectrometry and High-Pressure Liquid ChroChromatography with UV detection). The experiment was conducted in a simulated office, ventilated with 0.6 h−1, 2.5 h−1 and 6 h−1, in the presence of additional pollution sources (carpet, chipboard and linoleum). At the lowest Air change rate, additional measurements were made with no pollution sources present in the office. All conditions were tested with the photocatalytic Air Purifier turned on and off. The results show that operation of the Air Purifier in the presence of pollutants emitted by building materials and furniture improves indoor Air quality, as documented by sensory assessments made by human subjects. It also reduces concentrations of many chemical compounds present in the Air as documented by the PTR-MS technique. For the lowest ventilation, results from measurements using the chromatographic methods have similar tendency, however many of the 50 compounds that were targeted for analysis were not detected at all, independent of whether the Purifier was on or off. For the two conditions with higher ventilation the results were inconclusive.

  • Can a photocatalytic Air Purifier be used to improve the perceived Air quality indoors?
    Indoor Air, 2010
    Co-Authors: Jakub Kolarik, Pawel Wargocki
    Abstract:

    The effect of a photocatalytic Air Purifier on perceived Air quality (PAQ) was examined in rooms polluted by typical sources of indoor pollution. The rooms were ventilated at three different outdoor Air supply rates. The Air quality was assessed by a sensory panel when the Purifier was in operation as well as when it was off. Operation of the Purifier significantly improved PAQ in the rooms polluted by building materials (used carpet, old linoleum, and old chipboard), and a used ventilation filter as well as a mixture of building materials, used ventilation filter and cathode-ray tube computer monitors. The effect corresponded to approximately doubling the outdoor Air supply rate. Operation of the Purifier significantly worsened the PAQ in rooms with human bioeffluents, probably due to incomplete oxidation of alcohols which are one of the main pollutants emitted by humans. Present results show that the photocatalytic Air Purifier can supplement ventilation when the indoor Air is polluted by building-related sources, but should not be used in spaces where human bioeffluents constitute the main source of pollution. PRACTICAL IMPLICATIONS: The present results suggest that a photocatalytic Air Purifier can supplement ventilation when the indoor Air is polluted mainly by building-related sources, for example in unoccupied buildings outside working hours when ventilation is considerably reduced or turned off and pollutants build up and adsorb on indoor surfaces. The results also suggest that use of a photocatalytic Air Purifier should be avoided when humans are present and constitute main source of pollution.

Raúl Bermúdez – One of the best experts on this subject based on the ideXlab platform.

  • Experimental studies on removal of Airborne haloanisoles by non-thermal plasma Air Purifiers
    Energy and Buildings, 2016
    Co-Authors: Lei Fang, David Hallam, Raúl Bermúdez
    Abstract:

    A laboratory study was conducted to test the performance of non-thermal plasma Air Purifiers on its removal effectiveness of two haloanisoles – 2,4,6-trichloroanisole (TCA) and 2,4,6-Tribromoanisole (TBA). TCA and TBA are the two major compounds found in wine cellars that can contaminate wine to produce unpalatable mouldy and musty tastes. The test was first conducted in a climate chamber. The plasma Air Purifier was installed in a test rig developed for the testing and challenged by Airflow with certain concentrations of TCA and TBA. Air samples upstream and downstream of the Air Purifier was collected by Tenax tubes and the concentration of TCA and TBA were analyzed by thermal desodesorption GC–MS. The results showed that the plasma Air Purifier was effective on removing TCA and TBA with a single pass efficiency of better than 82%. The effect was further validated in a wine cellar under a realistic condition. The concentrations of TCA and TBA in the wine cellar decreased 94% and 50% respectively after running two plasma Air Purifiers for 5 days. The non-thermal plasma Air purification technology may be used in wine cellar to remove the two Airborne contaminants and prevent the wine from being contaminated during storage.

Soon-bark Kwon – One of the best experts on this subject based on the ideXlab platform.

  • Status of PM in Seoul metropolitan subway cabins and effectiveness of subway cabin Air Purifier (SCAP)
    Clean Technologies and Environmental Policy, 2014
    Co-Authors: Jong Bum Kim, Seyoung Kim, Gwang Jae Lee, Gwi-nam Bae, Youngmin Cho, Duckshin Park, Duck Hee Lee, Soon-bark Kwon
    Abstract:

    The increasing importance of indoor Air quality management on public transport led the Korean government to amend the indoor Air quality control in public use facilities, etc. Act including modes of public transport under the Act from June 2013. Particulate matter (PM) in subway systems is reported as being mostly generated by friction-between the wheels and the rails, between the wheels and the brake pads, and between the catenaries and the pantographs. In order to reduce PM level in subway cabins, a newly developed subway cabin Air Purifier (SCAP) was installed on the ceilings of the cabins. In this study, we analyzed indoor PM concentrations through continuous measurement of PMs less than 10 mu m in diameter (PM10) and PMs less than 2.5 mu m in diameter (PM2.5) in the cabins of line 2 and line 5 of the Seoul metropolitan subway network, comparing the concentrations in cabins where SCAP devices were installed to cabins without them in order to verify SCAP effectiveness. In both cabins with and without SCAP, the ratio of indoor to outdoor PM10 (I/O for PM10) showed a two-times higher value in line 5 than in line 2, which indicated that the entirely underground line 5 was less ventilated with outdoor Air. In addition, the ratio of indoor PM2.5/PM10 showed that coarse mode PM was more abundant in line 5 due to poor ventilation in the tunnel sections compared to that of line 2. Regarding the effectiveness of SCAP, it was found that changes of PM10 concentrations in line 2 and line 5 were from 132.8 to 112.2 mu g/m(3) (15.5 % efficiency) and from 154.4 to 114.2 mu g/m(3) (26.0 % efficiency) after SCAP installation, respectively.

Renato Zenobi – One of the best experts on this subject based on the ideXlab platform.

  • Studying the fate of non-volatile organic compounds in a commercial plasma Air Purifier.
    Journal of hazardous materials, 2013
    Co-Authors: Stefan Schmid, Lukas Meier, Christian Berchtold, Cornelia Seiler, Andreas C Gerecke, Herbert Hächler, Hubert Hilbi, Joachim Frey, Simon Weidmann, Renato Zenobi
    Abstract:

    Degradation of non-volatile organic compounds-environmental toxins (methyltriclosane and phenanthrene), bovine serum albualbumin, as well as bioparticles (Legionella pneumophila, Bacillus subtilis, and Bacillus anthracis)-in a commercially available plasma Air Purifier based on a cold plasma was studied in detail, focusing on its efficiency and on the resulting degradation products. This system is capable of handling Air flow velocities of up to 3.0m s(-1) (3200Lmin(-1)), much higher than other plasma-based reactors described in the literature, which generally are limited to Air flow rates below 10Lmin(-1). Mass balance studies consistently indicated a reduction in concentration of the compounds/particles after passage through the plasma Air Purifier, 31% for phenanthrene, 17% for methyltriclosane, and 80% for bovine serum albualbumin. L. pneumophila did not survive passage through the plasma Air Purifier, and cell counts of aerosolized spores of B. subtilis and B. anthracis were reduced by 26- and 15-fold, depending on whether it was run at 10Hz or 50Hz, respectively. However rather than chemical degrdegradation, deposition on the inner surfaces of the plasma Air Purifier occured. Our interpretation is that putative “degradation” efficiencies were largely due to electrostatic precipitation rather than to decomposition into smaller molecules.

  • Online monitoring of molecular processes in a plasma Air purifying system.
    Environmental science & technology, 2012
    Co-Authors: Stefan Schmid, Lukas Meier, Christian Berchtold, Renato Zenobi
    Abstract:

    Plasma Air purifying systems present an interesting alternative to filters for purifying Air. In this study, molecular processes in a commercially available ac driven plasma Air Purifier were studied in detail. This Air Purifier is supposed to reduce all Air contaminants to small nontoxic molecules (e.g., H2O and CO2). However, degradation mechanisms are not yet fully understood. In this study, we investigated the exhaust of the plasma Air Purifier to determine which degradation products are formed. An interface was designed and constructed to allow the direct coupling of the plasma Air Purifier’s exhaust to a mass spectrometer. The compounds studied, primary and secondary amines, were introduced at a concentration of 1 ppmV. Contrary to our expectations, polymerization instead of degradation was observed. The higher the ac voltage applied (max. 9.0 kV) to the plasma Air Purifier, the higher the mass of the oligomer distribution. Side chain oxidation products as well as oligomers could be observed for all…

Lei Fang – One of the best experts on this subject based on the ideXlab platform.

  • Experimental studies on removal of Airborne haloanisoles by non-thermal plasma Air Purifiers
    Energy and Buildings, 2016
    Co-Authors: Lei Fang, David Hallam, Raúl Bermúdez
    Abstract:

    A laboratory study was conducted to test the performance of non-thermal plasma Air Purifiers on its removal effectiveness of two haloanisoles – 2,4,6-trichloroanisole (TCA) and 2,4,6-Tribromoanisole (TBA). TCA and TBA are the two major compounds found in wine cellars that can contaminate wine to produce unpalatable mouldy and musty tastes. The test was first conducted in a climate chamber. The plasma Air Purifier was installed in a test rig developed for the testing and challenged by Airflow with certain concentrations of TCA and TBA. Air samples upstream and downstream of the Air Purifier was collected by Tenax tubes and the concentration of TCA and TBA were analyzed by thermal desorption GC–MS. The results showed that the plasma Air Purifier was effective on removing TCA and TBA with a single pass efficiency of better than 82%. The effect was further validated in a wine cellar under a realistic condition. The concentrations of TCA and TBA in the wine cellar decreased 94% and 50% respectively after running two plasma Air Purifiers for 5 days. The non-thermal plasma Air purification technology may be used in wine cellar to remove the two Airborne contaminants and prevent the wine from being contaminated during storage.