| 1. |
- Afshari, Alireza, 1956, et al.
(författare)
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Naborøg og overførsel af partielforurening
- 2010
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Ingår i: HVAC - Magasin for klima- og energiteknik, miljø, bygningsinstalltioner & -Netværk. ; 1:2010, s. 24-30
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 2. |
- Afshari, Alireza, 1956, et al.
(författare)
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Quantification of ultrafine particles from second-hand tobacco smoke infiltration
- 2010
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Ingår i: Proceedings of the CLIMA 2010 Conference: 10th REHVA World Congress 'Sustainable Energy use in Buildings', 8 pages.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- This paper presents some of the results of a second-hand tobacco smoke intervention studycarried out in 19 flats in four different buildings. Two of the investigated buildings were nonrenovatedand two others were renovated. The aim of the study was to quantify infiltration ofultrafine particles from a smoker's flat into a non-smoker's flat. In addition, several tests werecarried out to describe some solutions for reduction of particle concentrations in the smoker'sflat and the non-smoker's flat. The air change rates and the indoor particle concentrationswere measured continuously during the measuring periods. The particle sources (particlegenerating activities) were cigarette-burning in the un-occupied buildings and candle-burningin the occupied buildings. Reductions of the concentration of ultrafine particles using aircleaning devices were studied. Results showed that the transfer of ultrafine particles wasabout 9% when the source flat was located below the receiving flat, whereas the transfer was1-2% when the source flat was on the same floor as, or above, the receiving flat.
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| 3. |
- Deng, Qihong, et al.
(författare)
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Source Apportionment and Chemical composition of particulate matter (PM10) in university classrooms
- 2009
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Ingår i: Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology). - 1672-7207. ; 40:2, s. 332-328
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Tidskriftsartikel (refereegranskat)abstract
- The inhalable particulate matter (PM10) was continuously monitored and sampled in the classrooms of Central South University at Changsha by Tapered Element Oscillating Microbalance 1400a (TEOM 1400a) from September to December, 2007. The chemical compositions of the PM10 samples were analyzed by the X-ray fluorescence (XRF), and then the source apportionment of the classroom particles was investigated by the principal component analysis (PCA). The results show that the mean PM10 concentration in classrooms is (176.56±57.63)
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| 7. |
- Ekberg, Lars, 1962, et al.
(författare)
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Removal of ultrafine particles by ventilation air filters
- 2009
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Ingår i: 9th International Healthy Buildings Conference and Exhibition, HB 2009; Syracuse, NY; United States; 13 September 2009 through 17 September 2009.
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Konferensbidrag (refereegranskat)abstract
- The purpose of the investigation is to clarify how the filtration efficiency for ultrafine particles (UFPs) varies depending on the aerosol size distribution upstream of the filter. Filter classes F5-F7 (according to the European standard EN779) and combinations of these filter classes are studied.The fractional filtration efficiency for particles ranging from 5 nm to 100 nm was estimated based on previous publications. The downstream concentration and size distribution was calculated for each of four outdoor aerosols representing both urban and rural conditions. When interpreting data expressed as the total number concentration (dp>5 nm), the studied F7-filter (corresponding roughly to MERV 13 according to the applicable US-standard) showed filtration efficiencies between 65% and 83%. The results also indicate that measurements with an instrument providing the number concentration of particles larger than 20 nm will underestimate the total UFP-filtration efficiency by about 10%-units, estimated as an average value for all of the studied filter classes.
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| 8. |
- Kadribegovic, Ragib, 1975, et al.
(författare)
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Air Cleaning by Photo Catalytic Oxidation: An Experimental Performance Test
- 2011
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Ingår i: ASHRAE Transactions. - 0001-2505. ; 117:1, s. 426-433
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Tidskriftsartikel (refereegranskat)abstract
- The paper presents the results from an experimental evaluation of a novel air cleaner based on UVC radiation at 253.7 nm in combination with a titanium dioxide (TiO(2)) catalytic converter. The wavelength of the UV light is selected with the purpose of enhancing the capability of the device to deactivate micro-organisms. Furthermore, the selected UV-wavelength is expected not to cause any substantial generation of ozone. The air cleaner, denoted PCOC3, consists of three photo catalytic oxidation (PCO) chambers connected in series. The device is equipped with a pre-filter for removal of airborne particles (MERV 11). The air cleaner is intended for in-duct use, i.e. integration in central ventilation systems. In a subset of the experiments ozone was generated by an electrical spark generator placed upstream of the tested air cleaner and measured downstream by a direct reading instrument based on UV-spectroscopy. In another subset of experiments selected VOCs were injected into the test-rig and the decay was measured after the VOC injection had been stopped. The measurements showed no signs of any ozone being generated by the PCOC3. Instead the results indicate that ozone is captured by the device at a removal rate corresponding to 67 air changes per hour in the test-rig used, which, in turn corresponds to a single pass efficiency of about 15%. Also the studied VOCs were found to be removed by the PCOC3, but at substantially lower rates; in the range of a few air changes per hour only.
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