indoor air quality and hvac . . . a correlation
DESCRIPTION
Rutledge Environmental presentation prepared by Jack RutledgeTRANSCRIPT
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IAQ and HVACa
CorrelationBy: Jack Rutledge, ASCS, CMRS President Rutledge Environmental
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Outline of Program
1. History2. Define IAQ / SBS / BRI3. HVAC Systems Design4. Effects of Maintenance on HVAC
System
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The Year is: 1976
• Jimmy Carter is elected President• Israeli Assault Team rescues hijacked
hostages on an Air France Plane in Entebbe, Uganda
and• A Legionnaires’ Convention was held at the
Stratford Hotel in Philadelphia, PA
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• 221 Legionnaires became ill• 34 Died• Later Discovered an “Unknown Bacterium”
had infected a Cooling Tower which supplied a RTU that conditioned the rooms of the Legionnaires who became ill
• The bacterium was later named Legionella
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1977
• OPEC Oil Embargo• Rationing of Gasoline• President Carter issues edict that new
Building Construction will be designed to reduce Energy Consumption by making them “Tight Buildings”
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Tight Building Syndrome
• Key Factor in Development of “IAQ”
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1984• NO “Indoor Air Quality Associates”• NO “National Air Duct Cleaners
Association”But:
For 1st timeWorld Health Organization uses term:
“Sick Building Syndrome”Described as:
“A cluster of symptoms occurring with increased frequency in Buildings with
Indoor Climate Problems.”
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2007
• 30th Anniversary of President Carter’s edict to “tighten up buildings
• We now have:– IAQA– NADCA– ACR2006– SBS– BRI
and– LITIGATION
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One of the 1st Major Lawsuits on IAQ - SBS
• EPA Headquarters – Washington, D.C. 1990
• 19 EPA Employees Filed Suit• The Verdict Against EPA was
Approximately $3 Million• Later Overturned by D.C. Superior Court
AndSettled Out of Court
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And More Litigation or
Threatened Litigation
• Brevard Community College in Florida-Professor Sues – Mold in Classroom made her sick
• Eastern Wyoming College-Closes Student Apartment Building due to Mold
• University of KentuckySAE Fraternity Building-Closes Temporarily while Mold Remediation Performed
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Correlation of:Indoor Air Quality
andHVAC Systems
• 1st Major IAQ Case-Legionnaires Disease resulted from Contaminated HVAC System
• HVAC Systemseither:1. The Problem
or2. A Conduit
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HVAC Maintenanceor
Lack of MaintenanceNot Only Problem
• Poor Design is Major FactorDesign depends on several Variables:-Age of Design-Building Codes in Effect at the time of Design-Budget that was available for the Project-Original Planned use of Building-Owner’s and Designer’s individual preferences-Subsequent Modification
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Typical Single Zone HVAC
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Dirty Reheat Coil
Restricted Air Flow
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Dirty Coils
Restricted Air Flow AndReduced Capacity to Condition Air
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Dirty Return Grill
Restricts Air Flow And Breeding Ground for:
-Mold -Bacteria
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Dirty Air Duct
Restricts Air Flow And Breeding Ground for:
-Mold -Bacteria
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Lack of Regular Filter Change
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Results of Dirty HVAC System
• Air Flow Reduced• More OA Required• Less reduction of Moisture from air passing
through Cooling Coils• Increased Humidity• Greater probability of Mold Growth both in:
HVAC System and
Conditioned Space of Building
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Visual Effect of Dirty HVAC System
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More Complaints FromBuilding Occupants
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More Complaints FromBuilding Occupants
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More Complaints FromBuilding Occupants
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Solutions
• Regular Filter Changes• Check Filters for “Blow By”• Regular Coil Cleaning
Both Primary Coilsand Reheat Coils
• Entire HVAC System Cleaning When Needed
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EPA’sHVAC Checklist – Short Form
andIAQ Management Checklist
See Inserts in Handout
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Reheat Coils Before/After
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Cooling CoilsBefore/After
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Return Air GrillBefore/After
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Duct WorkBefore/After
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HVAC System
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Results of Good Maintenance
• Less Humidity Problems• Less Musty Smells• Less Hotspots/Coldspots
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Happy Building Occupants
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Happy Maintenance Staff
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QUESTIONS?
Jack Rutledge, ASCS, CMRS
Rutledge Environmental
800.493.1117