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Prof Noakes said that a “revolution” is needed in how governments regulate indoor air quality and in how the issue is handled in degree and apprentice courses. Another scientist involved is Dr Julian Tang, honorary associate professor and clinical respiratory virologist at the University of Leicester. He says indoor spaces with poor ventilation are a … Read more
“Cleaner indoor air won’t just fight the pandemic, it will minimize the risk of catching flu and other respiratory infections that cost the U.S. more than $50 billion a year, researchers said in a study in the journal Science on Friday. Avoiding these germs and their associated sickness and productivity losses would, therefore, offset the cost of … Read more
“If an infectious virus spreads predominantly through large respiratory droplets that fall quickly, the key control measures are reducing direct contact, cleaning surfaces, physical barriers, physical distancing, use of masks within droplet distance, respiratory hygiene, and wearing high-grade protection only for so-called aerosol-generating health-care procedures. Such policies need not distinguish between indoors and outdoors, since … Read more
Lethal to microorganisms, ultra-violet radiation in the range of 2250 to 3020 angstroms is used in a variety of disinfection applications, a process referred to as ultra-violet germicidal irradiation (UVGI). Since the first UVGI system was successfully implemented for disinfecting the municipal water system in Marseilles, France, in 1909, the disinfection of medical equipment using … Read more
Severe Acute Respiratory Syndrome (SARS) virus is an emerging respiratory infection that has caused outbreaks in health care settings (Ho et al 2003, HWFB 2003). SARS virus is a new variant of the coronavirus family and transmits through the air and by direct contact. (He et al 2003, CDC 2003). SARS coronavirus is one of … Read more
All procedures that were performed before the installation of the ultraviolet lighting used horizontal laminar airflow, whereas all procedures that were performed after that date used ultraviolet lighting without laminar airflow. Factors associated with the rate of infection were analyzed. Results: Over a nineteen-year period, forty-seven infections occurred following 5980 joint replacements. The infection rate … Read more
The International Ultraviolet Association (IUVA) Draft Guidelines for UVGI Air Treatment Systems are international voluntary guidelines developed under the auspices of the IUVA. This consensus represents a substantial agreement reached by parties in Academia and Industry with direct or indirect interests in air treatment with UVGI and related technologies. This consensus signifies the concurrence of … Read more
Mathematical models of the response of populations of microorganisms exposed to ultraviolet germicidal irradiation (UVGI) are developed that include two-stage response curves and shoulder effects. Models are used to develop a C++ computer program that is capable of predicting the performance of UVGI air disinfection systems. The algorithms are based on models for 1) the … Read more
A dimensional analysis of ultraviolet germicidal irradiation (UVGI) air disinfection system within a diffusely reflective enclosure is performed using the Buckingham pi theorem. The eight dimensionless parameters obtained include the duct aspect ratio, the lamp aspect ratio, the reflectivity, and terms that incorporate the UV dose, airflow, duct dimensions, and lamp location coordinates. Computer simulation … Read more
