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Healthy Indoor Environments

Healthy Indoor Environments. David W. Bearg, PE, CIH June 4, 2003 Greening the Government Conference, Philadelphia, PA. HEALTHY INDOOR ENVIRONMENT: ABSENCE OF IAQ PROBLEMS. IAQ PROBLEMS ARISE WHEN SOMETHING GOES WRONG! EITHER INADEQUATE VENTILATION, PRESENCE OF AIR CONTAMINANTS, OR BOTH.

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Healthy Indoor Environments

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  1. Healthy Indoor Environments David W. Bearg, PE, CIH June 4, 2003 Greening the Government Conference, Philadelphia, PA

  2. HEALTHY INDOOR ENVIRONMENT:ABSENCE OF IAQ PROBLEMS • IAQ PROBLEMS ARISE WHEN SOMETHING GOES WRONG! • EITHER INADEQUATE VENTILATION, PRESENCE OF AIR CONTAMINANTS, OR BOTH

  3. HEALTHY INDOOR ENVIRONMENT: ADEQUACY OF VENTILATION • IF THE HVAC SYSTEM ISN’T PERFORMING AS INTENDED, YOU COULD BE UNDERVENTILATING IN PARTS OF YOUR BUILDING, AND JEOPARDIZING THE PRODUCTIVITY OF THE WORKERS THERE.

  4. HEALTHY INDOOR ENVIRONMENT:ADEQUACY OF VENTILATION • WHAT’S NEEDED IS OPERATIONAL FEEDBACK ON THE AMOUNT OF OUTDOOR AIR FOR VENTILATION ACTUALLY BEING PROVIDED TO THE BUILDING OCCUPANTS

  5. HEALTHY INDOOR ENVIRONMENT:OPERATIONAL FEEDBACK ON PERFORMANCE • MONITORING • LEED IEQ CREDIT #1: • PERMANENT CARBON DIOXIDE (CO2) MONITORING SYSTEM.

  6. HEALTHY INDOOR ENVIRONMENT:LEED IEQ CREDIT 1 Intent: Provide capacity for indoor air quality (IAQ) monitoring to help sustain long-term occupant comfort and well-being. Requirements: Install a permanent carbon dioxide (CO2) monitoring system that provides operational adjustments.

  7. HEALTHY INDOOR ENVIRONMENT:OPERATIONAL FEEDBACK ON PERFORMANCE • MONITORING • ASTM D 6245-98 Standard Guide for Using Indoor Carbon Dioxide Concentrations to Evaluate Indoor Air Quality and Ventilation

  8. HEALTHY INDOOR ENVIRONMENT:OPERATIONAL FEEDBACK ON PERFORMANCE • MONITORING • INFORMATION MANAGEMENT APPLIED TO THE OPERATION OF THE BUILDING AND ITS HVAC SYSTEMS.

  9. OUTDOOR AIR PERCENTAGES AHU-4 AHU-5 AHU-6 AHU-8 100.0% 90.0% 80.0% 70.0% 60.0% 50.0% 40.0% 30.0% 20.0% 8:45:38 9:23:42 10:01:43 10:39:45 11:17:48 11:55:49 12:33:53 13:11:58 13:50:02 14:28:07 15:06:10 15:44:11 16:22:16

  10. HEALTHY INDOOR ENVIRONMENT:OPERATIONAL FEEDBACK ON PERFORMANCE • MONITORING CAN BE USED FOR DIAGNOSTICS, CONTROL, OR BOTH

  11. HEALTHY INDOOR ENVIRONMENT:MONITORING COSTS • AS MENTIONED BEFORE, PRODUCTIVITY GAINS CAN EXCEED ENERGY COSTS WITH INCREASED VENTILATION. IN ONE INSTALLATION, MONITORING COST $0.20/SF IN 250,000 SF BUILDING

  12. HEALTHY INDOOR ENVIRONMENT:NO AIR CONTAMINANTS PRESENT • PARTICULATES • VOCs • MOLD (MOISTURE) • CARBON MONOXIDE

  13. HEALTHY INDOOR ENVIRONMENT:POTENTIAL FOR MOLDS • LIMITING FACTOR IN THE GROWTH OF MOLDS INDOORS IS MOISTURE

  14. HEALTHY INDOOR ENVIRONMENT:NO AIR CONTAMINANTS PRESENT • CARBON MONOXIDE FROM LOWER LEVEL PARKING AREAS, LOADING DOCKS, OR NEARBY TRAFFIC

  15. HEALTHY INDOOR ENVIRONMENT:ADEQUACY OF VENTILATION • WHAT’S NEEDED IS OPERATIONAL FEEDBACK ON THE AMOUNT OF OUTDOOR AIR FOR VENTILATION ACTUALLY BEING PROVIDED TO THE BUILDING OCCUPANTS

  16. MONITORING FORVENTILATION PERFORMANCE • CAN REDUCE UNCERTAINTY & RISK IN THE OPERATION OF BUILDINGS • CAN IMPROVE DIAGNOSIS AND MANAGEMENT OF HVAC OPERATION • CAN INCREASE ABILITY OF ACHIEVING MORE OPTIMUM PERFORMANCE, CONSISTENT WITH GOALS FOR BOTH MAXIMAL IAQ & ENERGY EFFICIENCY

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