Effects of variable wind speed and direction on radon transport from soil into buildings: model development and exploratory results
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Model of radon entry and accumulation in multi-flat energy-efficient buildings
2021, Journal of Environmental Chemical EngineeringCitation Excerpt :Later, with development of the computer science technologies, the more complex multi-dimension models and time-dependent models became perspective numerical methods of modeling radon sources and transport [3,16]. An application of multi-dimensional computational fluid dynamic models provided a better simulation of the spatial distribution of 222Rn, 220Rn and progeny indoor [1,10,16,44,61] and in the soil air [15,39]. In the time dependent models, dynamic conditions of radon entry may be considered by expressing influencing factors as time variable functions [14,16].
Development of radon transport model in different types of dwellings to assess indoor activity concentration
2021, Journal of Environmental RadioactivityCitation Excerpt :The importance of the present work is being able to carry out evaluations of indoor Radon before making extensive measurements, also to make a possible assessment of areas and/or buildings with significative risk of presenting high levels of Radon. This goal is poorly treated in literature, and only very few works deal partially with it, studying only selected problem connected with the simulation of Radon flux from fractured rocks, specific soils composition, insulation materials (Ajayi et al., 2018; Riley et al., 1999; Savović et al., 2011a, b; Skubacz et al., 2019; Szajerski and Zimny, 2020). There is absence of papers that compare different types of buildings to evaluate a relative Radon risk index depending on the soil type and building materials.
Relating wind-induced gas transport in porous media to wind speed and medium characteristics
2020, Journal of Petroleum Science and EngineeringCitation Excerpt :Average wind speed and wind speed fluctuations near the surface of porous media potentially affect gas transport within the porous medium and consequently the subsurface-to-atmosphere gas exchange (Poulsen and Moldrup, 2006; Mohr et al., 2016; Pourbakhtiar et al., 2017). Wind-induced gas transport in porous media and exchange across the medium surface is important in connection with, for instance, intrusion of Radon, a radioactive gas, into buildings (Riley et al., 1999; Keskikuru et al., 2000; Wang and Ward, 2002), methane emissions from landfills (Poulsen et al., 2001; Poulsen and Moldrup, 2006), release of greenhouse gases from soil (including agricultural soil) to the atmosphere (Takle et al., 2004; Redecker et al., 2015; Goffin et al., 2015), and water evaporation from soil (Acharya and Prihar, 1969; Novak et al., 2000a, 2000b; Haghighi and Or, 2013, 2015a, 2015b; Poulsen et al., 2019). Impact of near-surface wind action on subsurface gas transport has traditionally been regarded as being controlled by rapid near-surface atmospheric pressure fluctuations induced by wind turbulence (Fukuda, 1955; Scotter and Raats, 1968, 1969; Massman and Frank, 2006; Poulsen and Sharma, 2011).
High-frequency fluctuations of indoor pressure: A potential driving force for vapor intrusion in urban areas
2020, Science of the Total EnvironmentNumerical modeling of the sources and behaviors of <sup>222</sup>Rn, <sup>220</sup>Rn and their progenies in the indoor environment—A review
2018, Journal of Environmental RadioactivityFree and forced gas convection in highly permeable, dry porous media
2017, Agricultural and Forest Meteorology
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Current address: Department of Mechanical Engineering, Carnegie Mellon, Pittsburgh, PA, USA.