4.7 Article

A study on the three-dimensional unsteady state of indoor radon diffusion under different ventilation conditions

Journal

SUSTAINABLE CITIES AND SOCIETY
Volume 66, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.scs.2020.102599

Keywords

Indoor radon environment; Radon diffusion and distribution; CFD simulation; Three-dimensional unsteady state; Stabilization time

Funding

  1. National Natural Science Foundation of China [U1867221]
  2. Natural Science Foundation of Hunan province of China [2020JJ6004]

Ask authors/readers for more resources

This study investigated the indoor radon diffusion from building materials and found that ventilation strategies can effectively reduce indoor radon concentration and stabilize radon distribution, consequently minimizing occupants' exposure to high radioactive levels of radon in urban environments.
The exhalation of radon from building materials is a serious risk to occupants? health. This paper studied the indoor radon diffusion under three-dimensional unsteady conditions. The radon exhalation rate of building materials was measured using a radon collection chamber combined with a RAD7-based radon/thoron detector. The indoor radon diffusion under different ventilation patterns were simulated by CFD (Computational fluid dynamics) based on the stabilization of radon concentration after 10 h in a closed environment as an initial condition. The results show that the stabilization time is 20 min, which can be reduced by appropriately increasing the air inlet velocity. Further increase in air velocity from 0.3 m s(-1) did not produce any significant changes in the stabilization time and the average radon concentration. Our findings show that the better way to reduce indoor radon concentration is to have the air supply inlet at the top or upper side and the air return outlet on the lower side of the room. The indoor radon can be reduced to a steady level after 20 min using the better ventilation method. The findings would contribute to the control of the indoor radon dispersion, and to alleviate and reduce occupants? exposure to high radioactive concentration of radon in urban cities.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available