This first of a three-part series describes UV-C light and how it is applied as a clean-up tool in all types of air conditioning systems.
Date: November 19, 2013
This Second of a three-part series describes UV-C light and how it is applied as a clean-up tool in all types of air conditioning systems. (read the article)
"The last installment of this three-part series describes how UV-C lamps are applied in HVAC systems to clean cooling coil surfaces, drain pans, air filters, and ducts to attain and maintain “as-built” capacity and indoor air quality."
"The 12-story BayView Corporate Tower in Fort Lauderdale, FL, installed UVC technology in an effort to lower energy costs and provide indoor air quality for tenants. The building saw a three-month return on its investment after the UVC installation." (read the article)
"Looking for lifecycle guidance or more extensive info for your stationary applications? An industry IAQ veteran weighs in about the design, installation, commissioning, retrofit, and O&M of ultraviolet systems for commercial HVAC equipment."
"Because ultraviolet germicidal irradiation (UV-C) kills all known microorganisms, this article outlines some basics of infectious diseases and points to engineering-level guidance for continuously reducing, or in some cases, preventing infectious pathogens from growing on or circulating in hospital spaces and HVAC systems."
In the United States, health-care-associated infections (HAIs), also known as hospital-acquired infections and nosocomial infections, kill more people than AIDS, breast cancer, and automobile accidents combined. The most dangerous HAI pathogens are those with the potential to spread by air.1 Many of these pathogens, such as methicillin-resistant Staphylococcus aureus (MRSA), are called “superbugs” because they are virtually invincible to standard drug treatments. Their airborne transmission through a non-immune population can be rapid and pervasive.2
As seen in Building Magazine's BuildingBuzz Ultraviolet germicidal irradiation or light in the UV-C wavelength (254nm) has been used extensively in commercial and institutional HVAC systems since the mid-1990s, initially to improve indoor air quality (IAQ), and later, to improve airflow, boost heat exchange efficiency, and reduce necessary maintenance.
This veritable HVAC hat trick is accomplished for an average of <$0.15 per cfm – a mere fraction of the 10-25 percent potential energy and maintenance savings yielded by the efficiency-enhancing technology.
During the winter months, the threat of cold and flu lingers in the back of many people’s minds. This is especially the case at schools and universities, where thousands of students, faculty, and staff congregate, bringing their germs with them.
The 2017 AHR EXPO was one for the books, and UV Resources is pleased to have cast its germicidal light on Sin City during the three day show.
“Anywhere you put thousands of people in close proximity, be it a hospital, airport, large office building or college, it’s advisable to try to eliminate disease transmission as much as possible…”
- Director of Facilities, Schenectady County Community College Alan Yauney
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.