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RECORD NUMBER: 20 OF 20

OLS Field Name OLS Field Data
Main Title Simplified Modeling of Air Flow Dynamics in SSD Radon Mitigation Systems for Residences with Gravel Beds.
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.;Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab.
Publisher May 92
Year Published 1992
Report Number PU/CEES-246; EPA/600/R-92/090;
Stock Number PB92-195635
Additional Subjects Air pollution control ; Air flow ; Radon ; Residential buildings ; Mathematical models ; Gravels ; Soil gases ; Mitigation ; Field tests ; Experimental design ; Radionuclide migration ; Aerodynamics ; Forecasting ; Porous media ; Pressure tests ; Performance evaluation ; Radioactive isotopes ; Subslab depressurization systems
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB92-195635 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 08/22/1992
Collation 81p
Abstract
In an attempt to better understand the dynamics of subslab air flow, the report suggests 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. (NOTE: Many subslab depressurization systems, those now considered most effective for mitigating residences for radon, do not perform entirely satisfactorily, even when designed and installed by professionals). The report shows that subslab air flow is most likely to be turbulent under actual field situations in houses with subslab gravel beds, but remains laminar when soil is present under the slab. The physical significance of a 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 to verify the model and experimentally determine the model coefficients of the pressure drop vs. flow for commonly encountered subslab gravel materials. These pressure drop coefficients can be used in connection with the simplified model as a rational way to assess subslab communication in houses. Preliminary field verification results in a house with gravel under the basement slab are presented and discussed.