UVGI system experts Jay Carter of Sanuvox and Dale Harrison of Fresh Aire UV explain the science and applications of Ultraviolet Germicidal Irradiation (UVGI) lamps. He explores the types of UVGI systems that can be installed in HVAC systems and facilities. Listen to expert tips and techniques to properly size and install several different types of UVGI systems, including maintenance and electrical requirements. The presentation was recorded at the 2023 Technical Seminar in Atlanta, GA.
View the presentation slides here: https://amped.egnyte.com/dl/XWqbY8Log9
For detailed show notes, read below and use the timestamps to navigate the episode:
[0:48] The speaker explains how installing Ultraviolet Germicidal Irradiation (UVGI) lamps inside a heating, ventilation, and air conditioning (HVAC) system improves air quality.
[1:30] Jay Carter of Sanuvox introduces himself and the presentation on UVGI lamps.
[2:40] Mr. Carter introduces the key terms he will define: frequency, intensity, and dose. These are the key factors that impact UVGI performance.
[3:24] Mr. Carter explains that UV-C, or germicidal UV, is classified as light between 100 and 280 nanometers. The most efficient electrical delivery of germicidal is low-pressure mercury vapor lamps.
[4:31] Ozone is formed every time the light frequency is below 240nm. Lower frequencies can break oxygen
bonds, resulting in the formation of ozone.
[5:32] Mr. Carter defines UV intensity as the measurement on a surface at a specific distance of the magnitude of UV light, or the amount of UV power. It is measured in microwatts per centimeter squared. The intensity number reduces as the distance from the lamp increases.
[8:21] UVGI Lamps age and depreciate in capacity based on burn time. Most manufacturers recommend changing them every year, while others recommend waiting two years.
[9:33] Mr. Carter defines “dose” as the method for measuring UV effectiveness in an environment. Comparing dose to the caliber of a gun, Mr. Carter explains that a different dose is necessary depending on the microbe that the user intends to target.
[12:30] Mr. Carter delves into common UVGI application types. He explains that UV will clean evaporator coils all the way through, thereby destroying microorganisms and replenishing capacity.
[16:10] Mr. Carter examines three different types of air disinfection applications. He explains that lamps are sometimes positioned parallel to the air stream to maximize contact time.
[18:50] Mr. Carter explains that not all UV lamps are created equal. Ballasts and lamps work in combination, so a faulty pairing of lamps and ballasts can negatively impact the performance of a lamp.
[20:45] Mr. Harrison speaks about the applications of UVGI lamps in classrooms, hospitals, and airports. He explains that natural air convection helps the lamps sterilize these spaces.
[22:05] Mr. Carter encourages experts to take a needs-based approach in their recommendations rather than attempting to push a solution without adequate explanation.
[23:50] UVGI is set apart from other technologies because of its extensive history of peer-reviewed testing. The science behind UVGI is over half a century old.
[26:23] Mr. Harrison explains the importance of accurate data to the application of UVGI technology.
[28:21] Harrison and Carter introduce the question section of their discussion. An attendee asks if there is a protocol for the disposal of lamps.
[29:05] An attendee asks if Harrison and Carter have seen an increase in installations to larger rooftop units.
[30:44] An attendee asks about the use of UV for coil cleaning in situations with serious calcium buildup.
[32:24] An attendee asks whether ozone monitoring is available for UVGI lamps.
[36:48] The popularity of UV increased after the COVID-19 pandemic, bringing a new demand for the technology.
[39:32] Mr. Harrison discusses UV exposure and safety, advising individuals to treat UV like electricity.

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