Abstract
The effect of enhanced filtration on protection citizens staying indoor against airborne radionuclides released during nuclear core melt accidents was determined by field measurements using outdoor particles as simulants. An electrically enhanced filter was installed in the HVAC system of an office building and its removal efficiency for particles was altered by using a separate particle charging section in power on and off positions. The effect of air filtration on indoor particle concentrations was determined by using an automated measurement system which was continuously sampling from the outdoor air, filtered supply air and exhaust air. With the aid of the measured outdoor and modelled indoor concentrations the indoor/outdoor ratio of particles of outdoor origin could be accurately determined. External charging of the particles increased the electret filters removal efficiency for 0.4 µrn size particles from 60% to 95%, resulting in decrease of the average I/O ratio of the same size particles from 0.67 to 0.40. Despite the high improvement in the supply air filtration efficiency the indoor concentrations decreased only modestly which is likely due to the leaky construction of the building, demonstrating the detrimental effect of air infiltration on the protection provided by buildings against outdoor airborne hazards. Practical implications: The developed method allows quantification of the key parameters affecting the protection of buildings against outdoor contaminants, thus allowing accurate estimation of size resolved indoor to outdoor ratios for fine particles. The electrically enhanced filter can remove effectively also submicron particles thus reducing the occupant exposure to outdoor hazardous or harmful materials. Best results can be achieved with airtight buildings.
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References
Bergman W, Biermann A, Kuhl W, Lum B, Bogdanoff A, et al. (1984). Electric Filtration: Theory, Laboratory Studies, Hardware Development and Field Evaluations. Lawrence Livermore National Laboratory.
Chan W (2006). Assessing the effectiveness of shelter-in-place as an emergency response to large-scale outdoor chemical releases. PhD Thesis, University of California, USA.
Chen A, Cao Q, Zhou J, Yang B, Chang VWC, Nazaroff WW (2016). Indoor and outdoor particles in an air-conditioned building during and after the 2013 haze in Singapore. Building and Environment, 99: 73–81.
EN (2012). CEN standard EN 779 2012. Particulate air filters for general ventilation. Determination of the filtration performance. Brussels, Belgium: European Committee for Standardization.
EN (2015). CEN draft standard prEN 16798-3-2015. Energy Performance of Buildings. Part 3: Ventilation for Non-residential Buildings—Performance requirements for ventilation and room-conditioning systems. Brussels, Belgium: European Committee for Standardization.
EU (2013). Council Directive 2013/59/EUROATOM of 5 December 2013 laying down basic safety standards for protection against the dangers arising from exposure to ionising radiation, and repealing Directives 89/618/Euratom, 90/641/Euratom, 96/29/Euratom
97/43/Euratom and 2003/122/Euratom. Available at https://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2014:013:0001:0073:EN:PDF. Accessed 14 Jan 2020.
EUROVENT (2014). EUROVENT Standard 4/21-2014. Calculation method for the energy use related to air filters in general ventilation systems. Paris, France: EUROVENT Association.
FEMA (2008). FEMA P-459/08255-1. Incremental Protection for Existing Commercial Buildings from. Principles of design for risk reduction related to CBR threats. US Department of Homeland Security. Federal Emergency Management Agency.
Fisk WJ, Faulkner D, Sullivan D, Mendell MJ (2000). Particle concentrations and sizes with normal and high efficiency air filtration in a sealed air-conditioned office building. Aerosol Science and Technology, 32: 527–544.
Grot RA, Persily AK (1986). ASTM STP 904. Measured air infiltration and ventilation in eight federal office buildings. In: Treschel HR, Lagus PL (ed), Measured Air Leakage of Buildings. Philadelphia, PA, USA: American Society for Testing and Materials. pp. 151–183.
Hanley JT, Ensor DS, Smith DD, Sparks LE (1994). Fractional aerosol filtration efficiency of in-duct ventilation air cleaners. Indoor Air, 4: 169–178.
Hussein T, Hämeri K, Aalto P, Asmi A, Kakko L, Kulmala M (2004). Particle size characterization and the indoor-to-outdoor relationship of atmospheric aerosols in Helsinki. Scandinavian Journal of Work, Environment & Health, 30(Suppl 2): 54–62.
IAEA (2011). IAEA TECDOC No. 1663. Radioactive Particles in the Environment: Sources, Particle Characterization and Analytical Techniques. Vienna, Austria: International Atomic Energy Agency.
Koponen IK, Asmi A, Keronen P, Puhto K, Kulmala M (2001). Indoor air measurement campaign in Helsinki, Finland 1999 - the effect of outdoor air pollution on indoor air. Atmospheric Environment, 35: 1465–1477.
Kulmala I, Taipale A, Heinonen K, Christiansen V, Jalonen T, et al. (2005). High security filtration system for protecting buildings from airborne chemical, biological and radiological hazards. In: Proceedings of Indoor Air 2005, Beijing, China, pp. 3370–3374.
Kulmala I, Salmela H, Kalliohaka T, Zwęgliński T, Smolarkiewicz M, et al. (2016). A tool for determining sheltering efficiency of mechanically ventilated buildings against outdoor hazardous agents. Building and Environment, 106: 245–253.
Kulmala I, Parviainen H, Hall I, Pasanen P (2020). A novel method for determining infiltration of mechanically ventilated buildings. Science and Technology for the Built Environment, 26: 250–256.
Lehtimäki M, Heinonen K (1994). Reliability of electret filters. Building and Environment, 29: 353–355.
Lin W, Chen L, Yu W, Ma H, Zeng Z, et al. (2015). Radioactivity impacts of the fukushima nuclear accident on the atmosphere. Atmospheric Environment, 102: 311–322.
Malá H, Rulík P, Bečková V, Mihalík J, Slezáková M (2013). Particle size distribution of radioactive aerosols after the Fukushima and the Chernobyl accidents. Journal of Environmental Radioactivity, 126: 92–98.
Masson O, Ringer W, Malá H, Rulik P, Dlugosz-Lisiecka M, et al. (2013). Size distributions of airborne radionuclides from the fukushima nuclear accident at several places in Europe. Environmental Science & Technology, 47: 10995–11003.
Mead KR, Gressel MG (2002). Protecting building environments from airborne chemical, biological, or radiological attacks. Applied Occupational and Environmental Hygiene, 17: 649–658.
Persily A, Chapman R, Emmerich S, Dols W, Davis H, et al. (2007). Building retrofits for increased protection against airborne chemical and biological releases. National Institute of Standards and Technology, NISTIR-7379. Available at https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=861035. Accessed 15 Jan 2020.
Raynor PC, Chae SJ (2003). Dust loading on electrostatitically charged filters in a standard test and a real HVAC system. Filtration & Separation, 40: 35–39.
Shi B (2012). Removal of ultrafine particles by intermediate air filters in ventilation systems. Evaluation of performance and analysis of applications. Building Services Engineering. PhD Thesis, Chalmers University of Technology, Sweden.
Walsh DC, Stenhouse JIT (1997). The effect of particle size, charge, and composition on the loading characteristics of an electrically active fibrous filter material. Journal of Aerosol Science, 28: 307–321.
Zhao B, Chen C, Yang X, Lai ACK (2010). Comparison of three approaches to model particle penetration coefficient through a single straight crack in a building envelope. Aerosol Science and Technology, 44: 405–416.
Acknowledgements
This study was financially supported by the European Union in frames of FP7 grant agreement no. 313037 and the Government of the Republic of Poland under a grant no. 2962/7.PR/13/2014/2.
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Kulmala, I., Zwęgliński, T., Smolarkiewicz, M. et al. Effect of enhanced supply air filtration in buildings on protecting citizens from environmental radioactive particles. Build. Simul. 13, 865–872 (2020). https://doi.org/10.1007/s12273-020-0621-6
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DOI: https://doi.org/10.1007/s12273-020-0621-6