Ultraviolet Germicidal Irradiation (UVGI) for Coils in the HVAC Systems |
Biohazards 6” Center Lamp Placement
The 6" Ultraviolet Germicidal Irradiation (UVGI) lamp unit placement is used for irradiating biohazards. The Ultraviolet Germicidal Irradiation (UVGI) kills the DNA of microorganisms. Ultraviolet Germicidal Irradiation (UVGI) lamps irradiate airborne microorganisms such as Tuberculosis, Ecoli and Bacillus anthracis. Based on given circumstances we may prefer to use lamps with 2" center.Placement of the Ultraviolet Germicidal Irradiation (UVGI) lamps should go downstream of the coils, placed after the coils, 6"-12" from the coils.
Biohazards 24” Center Lamp Placement
Ultraviolet in the ‘C’ band has been utilized for over 70 years to kill harmful micro orgasims. Engineered to kill infectious microbes, control fungi and eliminate mold related allergens while continuously mold and bacteria on the coils and drain pans.
Drain pans and coils that are irradiated are both clean and odor free as the source for the odors from the build up of mold, bacteria and allergens. Coil maintenance is greatly reduced and maintenance personnel are not exposed to the biocidal cleaning agents and other chemicals associated with coil maintenance. The system will run more efficiently by improving coil and heat transfer rates and airflow.
The Ultraviolet Germicidal Irradiation (UVGI) lamp matrix engineered design layout and lamp sizes will vary based on the specifics of each AHU coil and duct work sizing per location.
The installation of this system requires attaching the Ultraviolet Germicidal Irradiation (UVGI) lamps to the AHU coils or placement into the duct work. When positioned at the coils, the UVGI will irradiate anything attached to the coils, kills the mold, mildew, bacteria and render the coils clean. It will cut down on the coil maintenance, shutdown of the system, extra labor and improve the efficiency of the system dramatically. The Ultraviolet Germicidal Irradiation (UVGI) lamps maintain a level of safety and cleanliness.
Each system quoted includes one (1) Radiometer to be installed. The Radiometer provides continuous accurate detection of the Ultraviolet Germicidal Irradiation (UVGI) lamp life. The Radiometer is installed next to the lamp area and indicated when to change the lamps, therefore providing timely, required maintenance.
Exposure Time
A lethal exposure period of an organism is determined by its susceptibility, the wavelength of radiation, the density of the radiant flux(watts per unit area) and the time exposure. The germicidal effectiveness is proportional to the product of intensity times time from one microsecond to a few hours.
Principles of UV Air Disinfection
Definitions - Ultraviolet radiation includes invisible rays lying outside the voilet end of the visible spectrum. It is that portion of the electromagnetic spectrum having wave lengths from 200 to 400 nanometers. Germicidal UV used for air disinfection, is predominantly of 254 nm wavelength.
Inverse Square Law - Like visible light, UV diminished in intensity as the square of the distance from the UV source. Thus, for example, the intensity at 10 feet is 1/2 the intensity at 5 feet.
Logarithmic Law Of Disinfection - Airborne organisms exposed to UV of constant intensity are killed (or inactivated) at a rate which is proportional to the number of organisms present.
Bunsen-Roscoe Reciprocity Law - The dose of Radiation to which organisms are exposed is the intensity of radiation times the duration of exposure. The fraction of airborne organisms killed depends on the dose of UV and is not affected by reciprocal changes in intensity and duration of exposure.
Germicidal Effectiveness of UV - The germicidal effectiveness of UV varies dramatically depending on the specific wavelength within the broad UV spectrum. Commercially produced germicidal UV tubes give off 254nm radiation which is close to the peak of germicidal effectiveness. Germicidal UV 254nm is very effective against pathogenic airborne bacteria and viruses, but organisms vary in their susceptibility, with tubercle bacilli being more resistant than E. coli or S. marcescens.
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