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

2. 02/24/09 Group 9 – Department of Health Introduction Naturally occurring radioactive gas Colorless, tasteless, odorless Found all over the World Kills over 20,000 people each year (EPA)

3. 02/24/09 Group 9 – Department of Health 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

4. 02/24/09 Group 9 – Department of Health 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

5. 02/24/09 Group 9 – Department of Health 1/27/09 Group 9 – Department of Health 01/27/09 Group 9 – Department of Health The Design Concept Microsoft Excel Data Validation & Formulas Determining What is Needed

6. 02/24/09 Group 9 – Department of Health Design Concept – How it Works Equations / Theories Where: A eq = 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

7. 02/24/09 Group 9 – Department of Health 1/27/09 Group 9 – Department of Health Contaminant Equations - 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 Dilution Equation

8. 02/24/09 Group 9 – Department of Health On-site Testing Blower Door Fan Tests Leakages found from Pressurization and De-Pressurization tests

9. 02/24/09 Group 9 – Department of Health On-Site Testing Smoke sticks Pressure direction PressurizationDe-Pressurization

10. 02/24/09 Group 9 – Department of Health Results from On-site Testing Documented leakage characteristics Compared spreadsheet and actual values Values are within 10% Unexpected leakage sources

11. 02/24/09 Group 9 – Department of Health Results for Blower Door Test

12. 02/24/09 Group 9 – Department of Health Results of Blower Door Test

13. 02/24/09 Group 9 – Department of Health Spreadsheet Demonstration

14. 02/24/09 Group 9 – Department of Health The Future Fine tuning Compare results to efficiency regulations Make more aesthetically pleasing Write user manual

15. 02/24/09 Group 9 – Department of Health 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

16. 02/24/09 Group 9 – Department of Health 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