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Radon Mitigation using Ventilation Assessment Tool

Radon Mitigation using Ventilation Assessment Tool. Group 9 William Allred Joshua Chastain Daniel Diaz Ryan Nester. Introduction. Naturally occurring radioactive gas Colorless, tasteless, odorless Found all over the World Kills over 20,000 people each year (EPA).

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Radon Mitigation using Ventilation Assessment Tool

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  1. Radon Mitigation using Ventilation Assessment Tool Group 9 William Allred Joshua Chastain Daniel Diaz Ryan Nester

  2. Introduction • Naturally occurring radioactive gas • Colorless, tasteless, odorless • Found all over the World • Kills over 20,000 people each year (EPA) Group 9 – Department of Health

  3. Introduction – What is the Problem? • High rise residential buildings also have Radon problems • Limited on mitigation techniques • Ventilation applicable to dilute Radon • Need methods to estimate airflow for dilution Group 9 – Department of Health

  4. Project Scope • Develop a spreadsheet tool to evaluate the parameters necessary for successful mitigation of a single unit within a multi-family structure using ventilation techniques. • Current radon level • Target radon level • Natural leakage to outside • Ventilation rate required to reach target • Evaluation of increased load on A.C. system Group 9 – Department of Health

  5. The Design Concept Microsoft Excel Data Validation & Formulas Determining What is Needed Group 9 – Department of Health Group 9 – Department of Health Group 9 – Department of Health 1/27/09 01/27/09

  6. Design Concept – How it Works • Equations / Theories • Where: • Aeq = Estimated Leakage Area • P = Pressure • ρ = Density of Air • Q = Natural Ventilation Rate • V = Volume • ACH = Air Changes per Hour • C = Concentration of Radon • G = Generation rate of Radon Group 9 – Department of Health

  7. Contaminant Equations Dilution Equation - Mass of Radon in zone i after a given time - Initial mass of Radon in zone i - Mass flow rate of Radon into zone i - Generation rate of Radon in zone i - Mass flow rate of Radon out of zone i Group 9 – Department of Health Group 9 – Department of Health 1/27/09

  8. On-site Testing • Blower Door Fan Tests • Leakages found from Pressurization and De-Pressurization tests Group 9 – Department of Health

  9. On-Site Testing • Smoke sticks • Pressure direction Pressurization De-Pressurization Group 9 – Department of Health

  10. Results from On-site Testing • Documented leakage characteristics • Compared spreadsheet and actual values • Values are within 10% • Unexpected leakage sources Group 9 – Department of Health

  11. Results for Blower Door Test Group 9 – Department of Health

  12. Results of Blower Door Test Group 9 – Department of Health

  13. Spreadsheet Demonstration Group 9 – Department of Health

  14. The Future • Fine tuning • Compare results to efficiency regulations • Make more aesthetically pleasing • Write user manual Group 9 – Department of Health

  15. Acknowledgment • Special thanks to • Florida Department of Health • Clark Eldredge • Jorge Laguna • FAMU Director of Building Sciences • Thomas Pugh • Faculty Advisor • Juan Ordoñez • Homeowners • Garmin Ranck • Daniel Montesinos • Nicholas Landera Group 9 – Department of Health

  16. References • Design of Fluid Thermal Systems William S. Janna • NIST Multizone Modeling Website (CONTAM) http://www.bfrl.nist.gov/IAQanalysis/index.htm • Minneapolis Blower Door Operations Manual The Energy Conservatory • Walton, George. “CONTAM 2.4 User Guide and Program Documentation.” http://www.bfrl.nist.gov/IAQanalysis/docs/NISTIR_7251c.pdf Group 9 – Department of Health

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