Record Display for the EPA National Library Catalog


Main Title Modeling Air Flow Dynamics in Radon Mitigation Systems: A Simplified Approach.
Author Reddy, T. A. ; Gadsby, K. J. ; Black, H. E. ; Harrje, D. T. ; Sextro, R. G. ;
CORP Author Princeton Univ., NJ. Center for Energy and Environmental Studies. ;Lawrence Berkeley Lab., CA. Indoor Environment Program.;Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab.
Publisher c1991
Year Published 1991
Report Number EPA/600/J-91/318;
Stock Number PB92-120427
Additional Subjects Mitigation ; Air pollution control ; Radon ; Air flow ; Indoor air pollution ; Mathematical models ; Residential buildings ; Performance evaluation ; Pressure dependence ; Dynamics ; Experimental design ; Environmental engineering ; Design criteria ; Soil gases ; Air infiltration ; Reprints ; Subslab depressurization systems ; Active soil depressurization systems
Library Call Number Additional Info Location Last
NTIS  PB92-120427 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 9p
The paper refines and extends an earlier study--relating to the design of optimal radon mitigation systems based on subslab depressurization--that 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. It also shows that subslab air flow is most likely to be turbulent under actual field situations in houses with subslab gravel beds, while remining laminar when soil is present under the slab. It discusses the physical significance of a model and derives simplified closed-form equations to predict pressure and flows at various distances from a single central depressurization point. A laboratory apparatus was built to verify the 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 the simplified model as a rational means of assessing subslab connectivity in actual houses, which is an important aspect of the premitigation diagnostic phase. Preliminary field verification results in a house with gravel under the basement slab are presented and discussed.