Dr. Richard Corsi Profile picture
Mar 6 13 tweets 5 min read
1/ I always go in for my asymptomatic PCR testing @ucdavis on Sunday mornings & take the time to walk around campus before & after. It is such a gift to work at a great university w/ such a wonderful campus. A few images taken on those walks today & previously .....
2/ Our beautiful arboretum - Such a nice play to walk away from the office to clear one's mind and get some exercise.
3/ Lots of non-human animals all around campus.
4/ The @UCDavisCOE Coffee Center. First of a kind for fundamental research on coffee.
5/ As a dog lover, this one always pulls at my heart strings ...

Faithful Partner statue in the middle of the #1 ranked School of Veterinary Medicine in the world.
6/ Sciences Lab Building
7/ Just a nice place along a walkway behind the athletic complex.
8/ A student dining commons w/ a lot of outdoor seating around 2nd floor and ground level.
9/ One of several student dorm complexes on campus (w/ windows that open). The interior courtyards of this complex are beautiful - like a place I might want to retire someday!
10/ Kemper Hall - One of three major engineering buildings and home to the @UCDavisCOE dean's office (my home away from home).
11/ The future Diane Bryant Engineering Student Design Center - an expansion from current 9,000 to 23,000 sq ft and place where students & student teams can design, build prototypes, engage in start-up companies and more. Excited about grand opening in 9 mos or so.
12/ A couple of evening photos:

Mondavi Center for the Performing Arts.
13/ Eggheads

It's been a very difficult two years. Let's all try to get along.

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More from @CorsIAQ

Mar 7
1/ 3 hours in the late night & a seed tossed into the social media wind. Origin of the #CorsiRosenthalBox.

There were 2 motivations for the concept.

Motivation 1. Make effective air cleaning more accessible to those who cannot afford $300 HEPA air cleaners.
2/ Motivation 2. Help schools employ effective air cleaning at a cost that would not be prohibitive given financial constraints. In summer 2020 school districts seemed overwhelmed, confused, & vulnerable to purchasing shiny objects that might not actually be all that effective.
3/ Three criteria were considered for the device:
(1) Effective, removing a reasonable amount of virus-laden aerosol particles from indoor air.
(2) Inexpensive, much lower cost than HEPA air cleaners.
(3) Open source, not a “money maker” for anyone or any organization.
Read 26 tweets
Mar 5
1/ It would be easy to put a #CorsiRosenthalBox in a 3 m3 chamber with 0.05 ACH, inject particles, switch the system on, and show a dramatic downward trajectory of particle concentrations to effective 0 ug/m3 in 10s of seconds. But we do not do that, for it would be deceiving.
2/ Instead, studies are being done in actual classrooms, home environments, etc., and showing remarkable effectiveness at reducing aerosol concentrations. Further, experiments are being done to determine highly-relevant metrics like clean air delivery rate (CADR).
3/ Data indicate CADR of 400 to 800 cfm depending on fan and fan speed. These results can then be translated to estimate benefits in actual building spaces.
Read 10 tweets
Feb 10
1/ Inhalation dose of virus-laden respiratory aerosol particles w/ at least one infector in shared indoor space (two contrasting scenarios).

Everyone wearing a (mediocre vs. high-quality) mask vs. nobody wearing a mask.
2/ Everyone wearing a mask serves to reduce emissions, lower concentration in air, and reduce inhalation by receptor. Nobody wearing a mask leads to neither benefit.
3/ Let's assume mediocre cloth masks (or poorly fitted better masks) yield 50% reduction at source and receptor vs. 95% for high quality masks with good fit & compare to no masks at all (lifting the mask mandate and forgetting about sources amongst the population).
Read 11 tweets
Jan 27
1/ A single filter on fan can work, particularly in smaller spaces than a #CorsiRosenthalBox. Here are some concerns w/ a single filter that are not pointed out in a recent paper, & that led to the design of the box approach.
2/ Added resistance on the fan motor.
This was one of my primary concerns initially. This leads to lower air flow + potential for motor burnout.
3/ The filter has to be changed more often than filters when operated w/ four or five in parallel. The issue here is whether people replace the filter frequently enough. If not, the resistance on the fan can become even greater and air flow and overall CADR decrease even more.
Read 5 tweets
Jan 27
1/ COVID-19 is an airborne infectious disease. Lowering inhaled dose of virus-laden respiratory aerosol particles is critical for lowering probability of infection and adverse outcomes. So, what are we doing @UCDavisCOE?
2/ We have invested in 60 very good right-sized HEPA air cleaners placed in communal spaces throughout the college, materials to build 50 #corsirosenthalbox es for teaching labs and other spaces, & over 5,000 N95 masks for those who don't already have some.
3/ We are also encouraging outdoor meetings whenever possible (I enjoy seeing group meetings in the Kemper Hall courtyard!)
Read 5 tweets
Jan 13
1/ Tweets comparing the #corsironsenthalbox and portable HEPA filtration, including my own. I want to be clear that this is NOT a competition. The whole idea behind a CR box was to provide a viable and effective option for those without the resources to purchase a HEPA system.
2/ In fact, both will absolutely lower respiratory aerosol particles that convey the Omicron variant or other infectious agents. Both will reduce your inhalation dose to these agents, and that reduces your probability of infection and possible adverse outcomes.
3/ The CR box has the advantage of being much less expensive and highly effective if constructed well, and also a cool project and learning exercise for many. It has the disadvantage of being homemade (quality of construction varies) w/ possible leakage if kicked, etc.
Read 7 tweets

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