ASHRAE has long had standards and working groups on UVC, and recently published standard 241 on Control of Infectious Aerosols. The goal is to reduce transmission risk, not to support any one particular technology. Filtration is usually cheaper than Far-UVC and easier to maintain for the same level of infection control. Far-UVC/UVC is better in some niches, particularly in healthcare settings that require high air flow rates.
I suggest getting involved in ASHRAE and the research community that has been working on and developing standards for infection control for over a century.
From an EA perspective, I think it is more effective to promote adoption of ASHRAE Std 241 than the adoption of Far-UVC specifically.
-perspective of a Ph.D. mechanical engineer and ASHRAE member with experience in IAQ
I have colleagues in other organizations who are involved in ASHRAE; one contributed to the development of 241! 241 is great, and to be very clear, my job is not to promote far-UV, it is to promote indoor air cleaning. Far-UV gets a lot of attention in my social circles because it is exciting and new, and people have a lot of questions about that specifically—this post is meant for the very narrow case of answering questions I’ve directly gotten about far-UV.
Do you think the general superiority of filtration over Far-UVC is likely inherent to the technologies involved, or would the balance be reasonably likely to change given further development of Far-UVC technologies? In other words, is it something like solar, which used to be rather expensive for the amount of output but improved dramatically with investment, economies of scale, and technological progress?
(Of course, we could improve filter technology as well, although it strikes my uninformed eyes as having less potential room to improve.)
Far-UVC produces ozone. That’s inherent to the technology. That can be managed with ventilation, so places with already high ventilation rates where you don’t want the added static pressure in the air supply from greater filtration are a good fit for UVC. In other places, in-room air cleaners tend to be cheaper to operate and maintain. The “best” technology depends on space constraints, ventilation rates, first cost, maintenance, etc. If far-UVC gets cheaper, I expect it will become more widely used. But I don’t think it will fully dominate the space.
My position is the same as last year—I think there is enough technology at great enough maturity where it makes more sense to push for ASHRAE 241 adoption. Why doesn’t your local grocery store have airborne infection control technology? Is it because lack of sufficient technology development or cost, or more likely, because they don’t even know that’s a thing they should do?
Thanks! I may be thinking about it too much from the consumer perspective of owning a condo in a 100-year-old building, where the noise of filtration is a major drawback and the costs of a broader modernization of HVAC systems would be considerable.
I haven’t polled grocery store owners, but an owner would bear all the costs of improving air quality yet may capture few of the economic benefits. Although customers would care a lot in a pandemic, they probably wouldn’t otherwise care in a way that increases profits—and managers are incentivized toward short-term results. Cynically, most of their employees may not have paid sick time, so the owner may not even realize most of the benefit from reduced employee illness. (Of course, regulators could require compliance—but that’s not an awareness problem. So maybe the candidate intervention is lobbying?)
Just get a room air filter for your condo. There are different models and they are usually quite quiet unless on the highest setting. I can’t hear mine on the two lowest settings (up to 100 CFM). UVC doesn’t remove small particulates, which is the most serious air pollutant of concern from a health perspective for most homes.
Commercial buildings have to comply with locally required codes and standards. Code authorities could adopt some or all of ASHRAE Standard 241 in their jurisdiction just like they do with ASHRAE Standard 62.1 (ventilation) and 90.1 (energy).
ASHRAE has long had standards and working groups on UVC, and recently published standard 241 on Control of Infectious Aerosols. The goal is to reduce transmission risk, not to support any one particular technology. Filtration is usually cheaper than Far-UVC and easier to maintain for the same level of infection control. Far-UVC/UVC is better in some niches, particularly in healthcare settings that require high air flow rates.
I suggest getting involved in ASHRAE and the research community that has been working on and developing standards for infection control for over a century.
From an EA perspective, I think it is more effective to promote adoption of ASHRAE Std 241 than the adoption of Far-UVC specifically.
-perspective of a Ph.D. mechanical engineer and ASHRAE member with experience in IAQ
I have colleagues in other organizations who are involved in ASHRAE; one contributed to the development of 241! 241 is great, and to be very clear, my job is not to promote far-UV, it is to promote indoor air cleaning. Far-UV gets a lot of attention in my social circles because it is exciting and new, and people have a lot of questions about that specifically—this post is meant for the very narrow case of answering questions I’ve directly gotten about far-UV.
Do you think the general superiority of filtration over Far-UVC is likely inherent to the technologies involved, or would the balance be reasonably likely to change given further development of Far-UVC technologies? In other words, is it something like solar, which used to be rather expensive for the amount of output but improved dramatically with investment, economies of scale, and technological progress?
(Of course, we could improve filter technology as well, although it strikes my uninformed eyes as having less potential room to improve.)
Far-UVC produces ozone. That’s inherent to the technology. That can be managed with ventilation, so places with already high ventilation rates where you don’t want the added static pressure in the air supply from greater filtration are a good fit for UVC. In other places, in-room air cleaners tend to be cheaper to operate and maintain. The “best” technology depends on space constraints, ventilation rates, first cost, maintenance, etc. If far-UVC gets cheaper, I expect it will become more widely used. But I don’t think it will fully dominate the space.
My position is the same as last year—I think there is enough technology at great enough maturity where it makes more sense to push for ASHRAE 241 adoption. Why doesn’t your local grocery store have airborne infection control technology? Is it because lack of sufficient technology development or cost, or more likely, because they don’t even know that’s a thing they should do?
Thanks! I may be thinking about it too much from the consumer perspective of owning a condo in a 100-year-old building, where the noise of filtration is a major drawback and the costs of a broader modernization of HVAC systems would be considerable.
I haven’t polled grocery store owners, but an owner would bear all the costs of improving air quality yet may capture few of the economic benefits. Although customers would care a lot in a pandemic, they probably wouldn’t otherwise care in a way that increases profits—and managers are incentivized toward short-term results. Cynically, most of their employees may not have paid sick time, so the owner may not even realize most of the benefit from reduced employee illness. (Of course, regulators could require compliance—but that’s not an awareness problem. So maybe the candidate intervention is lobbying?)
Just get a room air filter for your condo. There are different models and they are usually quite quiet unless on the highest setting. I can’t hear mine on the two lowest settings (up to 100 CFM). UVC doesn’t remove small particulates, which is the most serious air pollutant of concern from a health perspective for most homes.
Commercial buildings have to comply with locally required codes and standards. Code authorities could adopt some or all of ASHRAE Standard 241 in their jurisdiction just like they do with ASHRAE Standard 62.1 (ventilation) and 90.1 (energy).