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Prof Cath Noakes #Ventilate 😷 💙 Profile picture
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Jun 16 • 4 tweets • 2 min read
Goodbye Kuopio,goodbye #IndoorAir2022. Thank you @isiaq and all the organisers for a wonderful conference with great venues, great science, great food and lots of conversations 1/
After 2 years of working under enormous pressure, this week has been the biggest mental reset I’ve had in a very long time. Being able to share experiences and have time to reflect on the future research has been amazing 2/
I’ve met up with many #IAQ friends who I last saw in 2018 and it has been great to catch up on the work they’ve been doing and all the social aspects 3/
I’ve also met lots of new people, especially inspiring early career researchers through the summer school and hearing them talk on their research. The future is looking bright for indoor air! Thank you #kuopio, thank you #IndoorAir2022

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More from @CathNoakes

Prof Cath Noakes #Ventilate 😷 💙 Profile picture
Jun 13
Our buildings matter for health and it’s time for a major upgrade to be resilient to disease including future pandemics. Today we announce a new report from @RAEngNews and @CIBSE on what is needed and why. A 🧵 on what we did: 1/
The new report raeng.org.uk/news/news-rele… takes a systems look at infection resilience in buildings to consider across design stages and operations on how we can make them healthy alongside being safe and sustainable. 2/
We ran workshops with input across buildings and transport sectors and commissioned three associated studies into research capacity, international best practice and the economics of improving buildings for infection resilience 3/
Read 18 tweets
Prof Cath Noakes #Ventilate 😷 💙 Profile picture
Mar 27
Our paper on far UV (222nm) with @EwanEadie @waseemhiwar @FletchLou, @DJBrennerCRR was finally published this week. A little 🧵 on what we did 1/nature.com/articles/s4159…
Firstly what is 222nm UVC? It’s a germicidal wavelength of UV light that can inactivate microbes in air or on surfaces. Tests show it is much safer for human exposure than conventional UVC at 254 nm. That means it may be possible to apply it in a room more easily 2/
Previous studies have looked at safety through human and animal models, and done small scale lab tests to show it inactivates different microbes including sars-cov-2. This includes a v small number of aerosol experiments with human coronaviruses and influenza 3/
Read 18 tweets
Prof Cath Noakes #Ventilate 😷 💙 Profile picture
Mar 12
Another ICYMI. We published this a couple of weeks ago from @PROTECT_NCS which validates a CFD exhalation model against measurements of human bacteria emitted from people in a chamber during singing, coughing and speaking onlinelibrary.wiley.com/doi/full/10.11… 1/
Model allows us to look at how particles of different initial sizes are carried by exhaled breath, partially evaporate and either deposit or remain in air. We use a non-volatile fraction to represent microbes, salts, proteins etc within the liquid aerosol 2/
Both experiments and CFD model show similar trends and the agreement is pretty good considering all the uncertainty with experiments using people and that CFD is idealised and misses variability 3/
Read 9 tweets
Prof Cath Noakes #Ventilate 😷 💙 Profile picture
Feb 9
The co2 meter in my Uni office normally reads 550-650ppm when I’m working. I spent 1 hr clearing out paper and the co2 went up to 940ppm. Same room, same ventilation, same person, just a change in activity 1/
Co2 is linked to metabolic rate so working harder pushes it up, and the difference can be quite a lot - my co2 more than doubled just by walking around and lifting papers (some were quite heavy!). Proper exercise can push up by around 4x 2/
Does this mean more virus emission? Hard to say for sure. My breathing rate will be up so there’s likely to be some increase, but probably not as much as vocalising - which may not increase co2 as much. Remember co2 is a proxy for ventilation but not necessary virus 3/
Read 8 tweets
Prof Cath Noakes #Ventilate 😷 💙 Profile picture
Feb 5
Todays thoughts on building ventilation. Its complex and we need to stop pretending that it isn't. There are sometimes easy solutions, but in some places it is harder or the easy solution brings new problems 1/
A building is an ecosystem. The temperatures, contaminants, airflows in it depend on its layout, orientation, height, fabric, ventilation system, heating/cooling system, windows, occupant numbers, activities, occupant schedules, weather, climate, outdoor air, noise... 2/
Most buildings have multiple spaces - occupied rooms, circulation zones, uninhabited rooms and the ceiling/floor/wall voids between them all. And they are connected together by doors, passive vents, airducts, wastewater systems, leaks in fabric etc....3/
Read 19 tweets
Prof Cath Noakes #Ventilate 😷 💙 Profile picture
Jan 20
Another little 🧵 on comfort, especially if ventilation is making spaces feel colder. You can sometimes use knowledge of radiant heating and air movements to feel warmer 1/
Our comfort indoors is roughly 50:50 air temperature and radiant temperature. Air temperature is what you measure on a thermometer but radiant temperature is controlled by the temperature of surfaces in a room 2/
So even if the temperature on your thermostat says 21C it’s not necessarily the temperature you’re feeling as it can feel warmer or colder depending on the surface temperatures. 3/
Read 16 tweets

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