Engine states: 0. Gate: off 1. after pulled back from gate: cold start 4% pwr (loads of unburned HC-emissions) max self sampling via gaspers π 2. Taxi: 4-7% pwr (least efficient combustion op. mode) 3. Takeoff: 100% pwr (no longer self sampling yay!) Gaspers go go goπ¨π¨π¨
These are dust particles / 1-1000 micrometers in diameter / as far as air pollution particles go, these are BIG, way bigger than particles emitted from burning stuff (wood, gasoline, jet fuel, plastic bags, dung).
This passing comment in tonight's #AAAR2022ID panel is one that really sticks with me. For much of this pandemic the thing that has F'd our collective response more than anything else is ppl's PERCEPTIONS of costs and benefits.
The strongly held BELIEF that running a box fan on low for 12h a day in every classroom of a school building for an entire school year will somehow bankrupt the district is straight up NOT TRUE.
Your PERCEPTION is wrong. Your off-hand comment is counter-productive. Your ability to do math is sub-par.
But this BELIEF is very strongly held by nearly all those in positions of power at schools bc frankly they WANT this statement to be true, so they don't have to deal w it.
- Expect the unexpected. In beginning we focused on healthcare facilities.. fitness centers.. restuarants - realized homes bc of poor ventilation were highest problem areas for virus aerosols.
Ultrafine particles matter a lot. In number. 90% of the number conc. 10% of the mass (they are not heavy). But they follow gas streamlines into your body - direct route to the deepest, dearest parts of your body. You don't want this. Lots of unknowns how terrible this..
UFPs can be solved w. improved filtration in the car cabin. Cabin air filters. We manufacturer filters. Bunch of fancy filters.
#AAAR2022 Aerosol Dispersion of Submicrometer Particles in an Aircraft Cabin. Stephanie Vannarath, Peter Kim, Mitchell Ford, Arvind Santhanakrishnan, Yu Feng, CHANGJIE CAI, The University of Oklahoma Health Sciences Center
Airplane cabins! Oh boy.. excited for this one.
infectious aerosols exist. Particularly interested in submicron ones - deep in our respir. tract. Travel further. Remain airborne longer. For the same mass, they have higher surface area.
Settling times of different particles 1 um. They can be suspended in the air for 9h.