Modeling air flow dynamics in radon mitigation systems: A simplified approach

T Agami Reddy, K. J. Gadsby, H. E. Black, D. T. Harrje, R. G. Sextro

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Subslab airflow dynamics provide important diagnostic information for designing optimal radon mitigation systems based on the subslab depressurization technique. In this paper, it is suggested that subslab air flow induced by a central suction point be treated as radial air flow through a porous bed contained between two impermeable disks. Next, we show that subslab airflow is most likely to be turbulent under actual field situations in houses with subslab gravel beds, while remaining laminar when soil is present under the slab. The physical significance of this model is discussed and simplified closed-form equations are derived to predict pressure and flows at various distances from a single central depressurization point. A laboratory apparatus was built in order to verify our model and experimentally determine the model coefficients of the pressure drop versus flow for commonly encountered subslab gravel materials. These pressure drop coefficients can be used in conjunction with our simplified model as a rational means of assessing subslab connectivity in actual houses, which is an important aspect of the pre-mitigation diagnostic phase. Preliminary field verification results in a house with gravel under the basement slab are presented and discussed.

Original languageEnglish (US)
Pages (from-to)1476-1482
Number of pages7
JournalJournal of the Air and Waste Management Association
Volume41
Issue number11
StatePublished - 1991
Externally publishedYes

Fingerprint

Radon
radon
airflow
Gravel
mitigation
gravel
Air
pressure drop
modeling
Pressure drop
slab
radial flow
suction
connectivity
Soils
soil

ASJC Scopus subject areas

  • Atmospheric Science
  • Waste Management and Disposal
  • Environmental Engineering
  • Environmental Science(all)
  • Environmental Chemistry

Cite this

Modeling air flow dynamics in radon mitigation systems : A simplified approach. / Reddy, T Agami; Gadsby, K. J.; Black, H. E.; Harrje, D. T.; Sextro, R. G.

In: Journal of the Air and Waste Management Association, Vol. 41, No. 11, 1991, p. 1476-1482.

Research output: Contribution to journalArticle

Reddy, TA, Gadsby, KJ, Black, HE, Harrje, DT & Sextro, RG 1991, 'Modeling air flow dynamics in radon mitigation systems: A simplified approach', Journal of the Air and Waste Management Association, vol. 41, no. 11, pp. 1476-1482.
Reddy, T Agami ; Gadsby, K. J. ; Black, H. E. ; Harrje, D. T. ; Sextro, R. G. / Modeling air flow dynamics in radon mitigation systems : A simplified approach. In: Journal of the Air and Waste Management Association. 1991 ; Vol. 41, No. 11. pp. 1476-1482.
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