Did you know that “bioaerosols account for a larger portion of the IAQ issue than any other single thing?” – Dr. Harriet Burge, HVAC industry scientific researcher.
Did you know that one would need a 5- hour daily exposure to UV-C for 300 years to potentially cause skin cancer? UV-B is most dangerous for carcinoma or melanoma.
Did you know that science has yet to find a microorganism that’s totally immune to the destructive effects of UV-C?
Did you know that it’s the Argon gas in a UV lamp that produces the color blue? It does this same thing in a bug zapping lamp to attract them.
Did you know that most mold and TB never die but rather go dormant? This is the main reason science wants the TB microbe exposed to UV-C, as it permanently destroys it.
Did you know that after a significant number of tests, researchers could always grow various microbes on the media of anti-microbially treated air filters?
Did you know that the hardest to kill microbe can be easily destroyed in less than one second by properly using the cheapest UV-C lamp available.
Did you know that “Battelle” was able to kill the hardest to kill Bacillus spore to 6- 9’s of efficiency in a moving airstream of 500 feet per minute! Anthrax is no problem.
Did you know that UV-C turns organic matter directly into gas and vapor by breaking chemical bonds and it does not produce heat while doing so?
Did you know that the angle of incident reflection from all but a perfectly polished surface, when struck with UV’s “¼” micron wavelength (“C”) is unpredictable?
Did you know that mold is at the bottom of the food chain so its process of digestion is referred to as being in the category of decay?
Did you know that microbes are truly ubiquitous? An identifiable microbe of some known type, in some form of “dormancy”, can be found most anywhere.
Did you know that UVC lamp mercury vaporizes in its low-pressure argon plasma to be struck by electrons; that produces the desirable 253.7nm germicidal photons.
Did you know that the mycotoxin called aflatoxin is from the mold Aspergillus flavus, and is some 1000 times more carcinogenic than the next most carcinogenic substance?
ASHRAE Ultraviolet Highlights and Timeline
- 2005 -TG 2.UVAS created at the ASHRAE- Winter Meeting 2005
- TG2.UVAS Scope – TG2.UVAS is concerned with all aspects of equipment and systems that utilize ultraviolet radiation to destroy or de-activate chemical and/or biological air and surface contaminants in HVAC systems and indoor spaces, including, but not limited to, effectiveness, safety, maintenance, and economics.
- 2006 - TG 2.UVAS was turned into a full Technical Committee (TC-2.9)-Ultraviolet Air & Surface Treatment (same scope as TG2.UVAS)
- 2006 - SPC-185.1 was formed -Method of Testing UVC Lights for Use in Air Handling Units or Air Ducts to Inactivate Airborne Microorganisms
- 2007- SPC-185.2 was formed -Method of Testing Ultraviolet Lamps for Use in HVAC&R Units or Air Ducts on Irradiated Surfaces.
- 2008 - ASHRAE Fundamentals Handbook Published, Chapter 16; ULTRAVIOLET LAMP SYSTEMS
- 2009 – ASHRAE Board of Directors publishes a position paper on Airborne Infectious Diseases, Highlights upper Room UV-C and in-duct UV as top research priorities.
- 2011 – SPC-185.1 goes out for first public review.
- 2011 – ASHRAE HVAC Applications Handbook Published; Chapter 60; ULTRAVIOLET AIR AND SURFACE TREATMENT
- 2012 – ASHRAE Handbook-HVAC Systems and Equipment (updated from 2008 handbook); Chapter 17; ULTRAVIOLET LAMP SYSTEMS
- 2012 – ASHRAE Position Document on Health Effects of Air Cleaning Devices committee started.
- 2013 – SPC-185.2 goes out for first public review.
- 2013 – SPC-185.1 goes out for second public review
- 2014 ANSI/ASHRAE Standard 185.2-2014 – Becomes a Published Standard.
Method of Testing Ultraviolet Lamps for Use in HVAC&R Units or Air Ducts to Inactivate Microorganisms on Irradiated Surfaces.
- 2014 - ASHRAE Board of Directors updates a position paper on Airborne Infectious Diseases, ranks Upper Air UVGI as number highest priority.
- 2014 – GPC-37P- Guidelines for the Application of Upper-Air (Upper Room) Ultraviolet Germicidal (UV-C) Devices to Control the Transmission of Airborne Pathogens Committee formed.
Advanced HVAC Systems for Improving Door Environmental Quality and Energy Performance of California K-12 Schools
This paper provides information on the need for improved indoor quality, energy use and maintenance in schools and other commercial buildings. A primer on the use of ultraviolet radiation for coil cleaning is provided that includes information on the types of UVC systems available, and their sizing, operation, maintenance, safety and cost. Examples of field test experience on the efficacy of the technology are provided. The presence of coil fouling and attendant increase pressure drop and degraded heat transfer and performance are addressed. The possible alternative means of cleaning coils and their attributes are discussed.
Implications of coil fouling and cleaning on relevant building codes are explored with the need for measuring coil degradation and including time-dependent performance in code requirements noted.
By: Maury Tiernan
Reprinted from School Construction News, March/ April 2001
The author discusses the importance of air filters for the removal of harmful solids and Ultraviolet light (UVC) to 'purify' the air. This article focuses on the fact that UVC destroys biological contaminants (yeast, mold, bacteria and viruses) by destruction of the organism's DNA.
Effect of ultraviolet germicidal lights installed in office ventilation systems on workers' health and wellbeing: double-blind multiple crossover trial
By: Dick Menzies, Julia Popa, James A. Hanley, Thomas Rand, Donald K. Milton
THE LANCET, Vol 362, November 29, 2003
In a double blind, multiple crossover trial of 771 participants in office buildings located in Montreal, Canada. Ultraviolet Germicidal lamps were placed within ventilation systems bathing drip pans and cooling coils with UVC energy. The lamps were off for 12 weeks and then turned on for 4 weeks. This process was repeated three times for 48 consecutive weeks. UVGI resulted in a 99% reduction of microbial and endotoxin concentrations on irradiated surfaces. The conclusion is that the use of UVGI could in the long run prove to be cost-effective compared to the yearly losses from absence because of building-related illness.
Lighting the Future The increased use of high-efficiency fluorescent lamps, which contain mercury, is pushing the demand for better recycling programs for these products
By: Anthony Zippi & Mark A. Ceaser
An analysis of the lighting industry shows a significant shift from the use of incandescent bulbs to fluorescent bulbs. Incandescent bulbs use more fossil fuel energy, cost more and are less effective than fluorescent bulbs, which produce more lumens. Usage of fluorescent bulbs, however, is not entirely without risk because they contain mercury, a chemical compound that can have debilitating effects on humans upon prolonged exposure. The risk of leaving mercury deposits in landfills is high; therefore, recycling seems the most conscientious and environmentally safe recourse. Our analysis will show that a national fluorescent bulb recycling law not only helps the environment but promotes new business growth and job opportunities as well.