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NAFA Guide To Air Filtration

NAFA Guide To Air Filtration. Chapter 14 Ultraviolet Germicidal Irradiation Photocatalytic Oxidation presented by the National Air Filtration Association. Fifth Edition. Different Bands of UV. UVGI-Range 200-280 nm. Installed on upstream side of coils. Typical UVGI Lamp Location.

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NAFA Guide To Air Filtration

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  1. NAFA Guide To Air Filtration Chapter 14 Ultraviolet Germicidal Irradiation Photocatalytic Oxidation presented by the National Air Filtration Association Fifth Edition

  2. Different Bands of UV

  3. UVGI-Range 200-280 nm

  4. Installed onupstream side of coils

  5. Typical UVGI Lamp Location

  6. How it Works • DNA of microorganisms absorb UVGI energy • Absorption of UVGI “dose” breaks the DNA strand

  7. Dose on the DNA Chain

  8. Figure 2. General ranking of suceptibility to UVC inactivation of microorganisms by group. k values: Susceptibility of microbes to UV

  9. UVGI Can Fill-in the Most Penetrating Particle/Organism Size (MPPS) Gap

  10. UVGI Warning • UV lights have several properties that make them hazardous to human skin and eyes • Skin – Erythema, is a redness of the skin caused by capillary congestion like a sunburn

  11. UVGI Warning • Eyes - Conjunctivitis (commonly called "Pink Eye") is an inflammation (burn) of the conjunctiva which is the the outermost layer of the eye and the inner surface of the eyelids

  12. UVGI Warning - Materials • UVGI can breakdown components in an HVAC system: • Electrical wiring – plastics of all kinds • Filters - synthetic media • Insulation - open-cell foam • Clear plastic – become brittle over time

  13. Summary Just like air filters: • UVGI must be installed correctly • UVGI must be maintained correctly • UVGI combined with air filtration provides an effective two-part particulate removal and microorganism inactivation system

  14. Sample Questions • UVGI is most effective on microorganisms in what range of the light spectrum? 200 to 280 nanometers • Why should UVGI lights be installed downstream of filters? UV light can destroy certain types of filter media material • What should technicians do before servicing units in which UV lights have been installed? Turn off lights prior to opening compartments where lights are located.

  15. Photocatalytic Oxidation (PCO) 254-356 nm

  16. PCO

  17. Types of PCO Reactors

  18. Types of PCO Reactors

  19. Types of PCO Reactors

  20. Types of PCO Reactors

  21. Summary • PCO is an immerging technology for cleaning the air of volatile organic compounds • Complete PCO reduces contaminants to CO2and H2O – (carbon dioxide and water) • PCO adds little pressure drop to the system

  22. Sample Questions • A drawback of PCO may be the? High initial cost of equipment • PCO has how many types of reactor configurations? Four • A PCO advantage is it’s? Reaction at ambient temperatures/ small addition of resistance to the HVAC system/ complete destruction of contaminant into harmless elements

  23. Thank you. Other Questions?

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