Indoor Air Quality and HVAC . . . a Correlation


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Rutledge Environmental presentation prepared by Jack Rutledge

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Indoor Air Quality and HVAC . . . a Correlation

  1. 1. IAQ and HVAC a Correlation By: Jack Rutledge, ASCS, CMRS President Rutledge Environmental
  2. 2. Outline of Program <ul><li>History </li></ul><ul><li>Define IAQ / SBS / BRI </li></ul><ul><li>HVAC Systems Design </li></ul><ul><li>Effects of Maintenance on HVAC System </li></ul>
  3. 3. The Year is: 1976 <ul><li>Jimmy Carter is elected President </li></ul><ul><li>Israeli Assault Team rescues hijacked hostages on an Air France Plane in Entebbe, Uganda </li></ul><ul><li>and </li></ul><ul><li>A Legionnaires’ Convention was held at the Stratford Hotel in Philadelphia, PA </li></ul>
  4. 4. <ul><li>221 Legionnaires became ill </li></ul><ul><li>34 Died </li></ul><ul><li>Later Discovered an “Unknown Bacterium” had infected a Cooling Tower which supplied a RTU that conditioned the rooms of the Legionnaires who became ill </li></ul><ul><li>The bacterium was later named Legionella </li></ul>
  5. 5. 1977 <ul><li>OPEC Oil Embargo </li></ul><ul><li>Rationing of Gasoline </li></ul><ul><li>President Carter issues edict that new Building Construction will be designed to reduce Energy Consumption by making them “Tight Buildings” </li></ul>
  6. 6. Tight Building Syndrome <ul><li>Key Factor in Development of “IAQ” </li></ul>
  7. 7. 1984 <ul><li>NO “Indoor Air Quality Associates” </li></ul><ul><li>NO “National Air Duct Cleaners Association” </li></ul><ul><li>But: </li></ul><ul><li>For 1 st time </li></ul><ul><li>World Health Organization uses term: </li></ul><ul><li>“ Sick Building Syndrome” </li></ul><ul><li>Described as: </li></ul><ul><li>“ A cluster of symptoms occurring with increased frequency in Buildings with Indoor Climate Problems.” </li></ul>
  8. 8. 2007 <ul><li>30 th Anniversary of President Carter’s edict to “tighten up buildings </li></ul><ul><li>We now have: </li></ul><ul><ul><li>IAQA </li></ul></ul><ul><ul><li>NADCA </li></ul></ul><ul><ul><li>ACR2006 </li></ul></ul><ul><ul><li>SBS </li></ul></ul><ul><ul><li>BRI </li></ul></ul><ul><ul><li>and </li></ul></ul><ul><ul><li>LITIGATION </li></ul></ul>
  9. 9. One of the 1 st Major Lawsuits on IAQ - SBS <ul><li>EPA Headquarters – Washington, D.C. 1990 </li></ul><ul><li>19 EPA Employees Filed Suit </li></ul><ul><li>The Verdict Against EPA was Approximately $3 Million </li></ul><ul><li>Later Overturned by D.C. Superior Court </li></ul><ul><li>And </li></ul><ul><li>Settled Out of Court </li></ul>
  10. 10. And More Litigation or Threatened Litigation <ul><li>Brevard Community College in Florida </li></ul><ul><li>-Professor Sues – Mold in Classroom made her sick </li></ul><ul><li>Eastern Wyoming College </li></ul><ul><li>-Closes Student Apartment Building due to Mold </li></ul><ul><li>University of Kentucky </li></ul><ul><li>SAE Fraternity Building </li></ul><ul><li>-Closes Temporarily while Mold Remediation Performed </li></ul>
  11. 11. Correlation of: Indoor Air Quality and HVAC Systems <ul><li>1 st Major IAQ Case- </li></ul><ul><ul><li>Legionnaires Disease resulted from Contaminated HVAC System </li></ul></ul><ul><li>HVAC Systems </li></ul><ul><li>either: </li></ul><ul><li>1. The Problem </li></ul><ul><li>or </li></ul><ul><li>2. A Conduit </li></ul>
  12. 12. HVAC Maintenance or Lack of Maintenance Not Only Problem <ul><li>Poor Design is Major Factor </li></ul><ul><li>Design depends on several Variables: </li></ul><ul><li>-Age of Design </li></ul><ul><li>-Building Codes in Effect at the time of Design </li></ul><ul><li>-Budget that was available for the Project </li></ul><ul><li>-Original Planned use of Building </li></ul><ul><li>-Owner’s and Designer’s individual preferences </li></ul><ul><li>-Subsequent Modification </li></ul>
  13. 13. Typical Single Zone HVAC
  14. 14. Dirty Reheat Coil Restricted Air Flow
  15. 15. Dirty Coils Restricted Air Flow And Reduced Capacity to Condition Air
  16. 16. Dirty Return Grill Restricts Air Flow And Breeding Ground for: -Mold -Bacteria
  17. 17. Dirty Air Duct Restricts Air Flow And Breeding Ground for: -Mold -Bacteria
  18. 18. Lack of Regular Filter Change
  19. 19. Results of Dirty HVAC System <ul><li>Air Flow Reduced </li></ul><ul><li>More OA Required </li></ul><ul><li>Less reduction of Moisture from air passing through Cooling Coils </li></ul><ul><li>Increased Humidity </li></ul><ul><li>Greater probability of Mold Growth both in: </li></ul><ul><li>HVAC System </li></ul><ul><li>and </li></ul><ul><li>Conditioned Space of Building </li></ul>
  20. 20. Visual Effect of Dirty HVAC System
  21. 21. More Complaints From Building Occupants
  22. 22. More Complaints From Building Occupants
  23. 23. More Complaints From Building Occupants
  24. 24. Solutions <ul><li>Regular Filter Changes </li></ul><ul><li>Check Filters for “Blow By” </li></ul><ul><li>Regular Coil Cleaning </li></ul><ul><li>Both Primary Coils </li></ul><ul><li>and Reheat Coils </li></ul><ul><li>Entire HVAC System Cleaning When Needed </li></ul>
  25. 25. EPA’s HVAC Checklist – Short Form and IAQ Management Checklist See Inserts in Handout
  26. 26. Reheat Coils Before/After
  27. 27. Cooling Coils Before/After
  28. 28. Return Air Grill Before/After
  29. 29. Duct Work Before/After
  30. 30. HVAC System
  31. 31. Results of Good Maintenance <ul><li>Less Humidity Problems </li></ul><ul><li>Less Musty Smells </li></ul><ul><li>Less Hotspots/Coldspots </li></ul>
  32. 32. Happy Building Occupants
  33. 33. Happy Maintenance Staff
  34. 34. QUESTIONS? Jack Rutledge, ASCS, CMRS Rutledge Environmental 800.493.1117