Airbrush

Air moves faster through an air duct when you constrict the duct. Water flows faster out a hose when you constrict the nozzle. Having many smaller ceiling vent fans EXPAND the size of the exit. When you increase the size of the exit door, more people can flow through the door walking, not running.

Exactly, that is why I have a problem with my original title, since A/C is not the issue. The issue is moving bad air out of the indoor space and bringing fresh air in. It has nothing to do with A/C or filtering or treating air. You don't need to filter or treat fresh air from outdoors. Any volunteers for math modeling? If you have many vent fans sucking air out the ceiling (like one fan per square meter), rather than one big fan that creates a wind tunnel, you distribute the motion over a greater area, increase the area of the air moving upward and out the ceiling. Therefore no wind tunnel. This will be better than nothing in a world where deadly pandemics can pounce on us at any time. A fan is not a very expensive, or sophisticated device, but installing so many of them will be more expensive. Will such installation be prohibitively expensive?

If you have about one ceiling exhaust vent per square meter of ceiling area, and have a fewer number of fresh air inflow vents near the floor, you can make the air move upward at a modest speed, not a "wind tunnel," and not move it "around." The heavier droplets and lighter droplet should separate quickly. The idea is to suck the bad air up and out the ceiling before it can infect someone. Personal protection of a mask, except the R95 mask, does not screen out virus in the air. It primarily prevents the wearer from spreading droplets. Personal protection is known to work and having better air replacement in public indoor spaces also could work. Hospitals, factories, warehouses, any kind of work spaces, would benefit from having steady air replacement. Companies can boast of how high their air replacement is to attract workers. Any businesses can boast of having accelerated air replacement.

Yes but we need to be prepared for diseases that are transmitted through the air. We were not prepared. 😲

Covid-19 is like a dress rehearsal for even more deadly pandemics. Covid-19 is bad enough, but in the future you may have more contagious and more deadly viruses escaping into human society. In such a world you better have good AHC if you want to do things indoors. Either that or "herd immunity" after tens or hundreds of MILLIONS of deaths. How fast the air is replaced in a room, warehouse, or sports arena depends on the NUMBER of exhaust and intake vents. If you have only a few vents there will be "wind tunnels." But if you have MANY vents to exhaust and intake air, you distribute the wind tunnel effect so the overall effect is a slow upward motion of perhaps a couple of miles per hour. Maybe that is fast enough to move the air upward. In a few seconds the virus-air is already above the heads of people, and moving upward. As the warm air moves upward it accelerates evaporation of water droplets, making them lighter and thus maybe not hang around so long. The lighter-weight and heavier-weight droplets may get quickly separated. Maybe the heavier droplets will fall to the floor and the lighter droplets carried upward. 😃

Hahaha, very funny. The "car cleaning" takes place between 1:00am and 5:00am when nobody is aboard. Just hook up the disinfectant hose to the car or bus. Pressurize with disinfectant until virus is dead. Then evacuate the car with 2 hoses, blast warm air into the car, exhaust air exits from the opposite end of the car/bus.

There could be a retro-fit. You can reroute the air intake around the HVAC system when you are not using the A/C for cooling. Then just fresh air from outdoors is pushed by more powerful fans. Fans don't use much current. You won't have cold air from your HVAC system, but you will have clean air from outdoors, just so long it is not very hot outside. If it is very hot outside, then sorry you are stuck with slow-push A/C fans. New construction can use more powerful fans. "Hanging out in a wind tunnel" is an exaggeration. The air just moves unnoticeably faster, so no matter how large the droplets are that came out when someone coughed or sneezed, the air will exit the room within a few seconds (not a wind tunnel). That is much better than the virus-air hanging around for M I N U T E S .

Rather than people going through subway cars and busses disinfecting surfaces, have intake and output vents for each car. You attach a vapor hose to the input vent and fill the car with pressurized disinfectant vapor. After the virus is dead, open the output vents and remove the vapor from the car by blasting warm air thru the car, from intake to output vents. Any complaints?

Hot air rises, so exhaust vents in the ceiling and air intakes through the floor, will speed the replacement of virus-air from an indoor space, and not spread it. With more powerful fans moving the air faster, and in an upward direction, the virus-air will get sucked out the ceiling sooner. The outdoor environment will dilute and deactivate the virus.

However you introduce air into a room (or workspace or sports arena), and how it exhausts, it would be safer for everyone that the air is circulated fast enough to minimize virus hanging around. Faster air motion means more powerful A/C. If the bad air exits the room through floor vents it could be piped to the roof and expelled to the environment which will deactivate the virus through wind dilution and UV light from the sun. The fresh air intakes do NOT need to be treated or filtered for virus. Just DON'T RECIRCULATE the same air.

Nursing homes have been a mass incubator for Covid-19 among the elderly. Maybe attention should be given to ventilation. Perhaps it would be better to have exhaust vents near the floor and fresh air is introduced into the room through the ceiling? Clearly ventilation systems are suspect. Just increasing the air flow would replace the virus air with cleaned air in about a minute. Theaters, restaurants, and offices can boast of having an accelerated air replacement system to reduce chance for virus to hang around too long. Then in your opinion it would be more efficient to exhaust bad air through vents near the floor and introduce UV treated/filtered air into the room from the ceiling?

Here is the idea. If an air conditioner was powerful enough, with intake and exhaust designed properly, you can remove Coronavirus (or any virus) from the air by the A/C moving the air faster than normal in an upward direction. You want the air to circulate so fast that if someone sneezes the water droplets will remain inside the room only a few seconds before it is sucked out the ceiling vent. For cooling the room, the idea is cool air enters the room near the floor and the warmer air exits through a ceiling vent, the "return." For heating the room you would also introduce warm air through low floor-vents, then the exhaust exits through the return in the ceiling. The exhaust air is either expelled to the exterior, or recirculated through an ANTI-VIRUS filter with maybe UV light to kill ANY virus before the air enters the room through the floor intake. The next pandemic could be an even nastier virus than Coronavirus.

It will be interesting to see if there is a spike in Covid-19 among the unprotected protesters, and their family and friends, at Dem state capitals that were protesting lockdown. I hope someone keeps track of them. They must be very healthy people who feel invulnerable to a tiny virus. Trump responded that the protesters were observing physical distancing "if you will believe it" he qualified. When I saw video of protesters standing close to each other, shouting near each other's faces, I would NOT believe it.

"Energy is the total amount of work done, and power is how fast you can do it. Power is energy per unit of time." For example, horse power is force (energy) x distance, then divide by unit time. More ENERGY is released than POWER when SBH merge. Most of that energy is released in gravitational waves. Through the release of neutrinos? Most energy of a supernova is released in neutrinos. "In 1966, Colgate and White calculated that neutrinos carry away most of the gravitational energy released by the collapse of massive stars...." https://en.wikipedia.org/wiki/Neutrino#Supernovae Does this also happen with the merger of SBHs?

The best scientists can explain what they do to someone who is not an expert. I'm not an expert and yet I learned a lot from the folks around here. 😃

"Many ID-issuing offices maintain limited business hours." Thank you for making my case. House of Reps should push Speed ID for everyone, then vote by mail. It will probably happen in the future, as the population grows and resources dwindle, authoritarians will take control. IF we could BRING plastic photo-IDs to all eligible voters, would anyone object to having an ID?

I totally agree. Is there a reason people would not want their own plastic, durable photo ID? When I got my first drivers license I was proud to carry it. If the Trump admin will stand in the way of "speed ID" (local issuing offices in every neighborhood open 24/7) then the Dem House should try to pass a "speed ID" bill. If Republicans block it, then it will be obvious to everyone that the GOP want to suppress the vote. Joe Biden can make a big deal about it in his campaign. "TRUMP WANTS YOU NOT TO VOTE"

Then getting a government ID should be facilitated. There should be offices set up in every local neighborhood that will issue official photo IDs. Getting an ID is a once-in-a-lifetime thing.

You are right about that. So let me qualify what I said. I BELIEVE that most people don't REALLY believe in God. It is more ACCEPT than believe, through social pressure and wanting to believe and belong, than real believing. Not everybody, just most people. Again, that is what I believe. I don't know about other Christian faiths, but in Catholicism we had to memorize the Apostle's Creed. It is a prayer with a series of things to believe in that I never had any reason to believe other than I was told to believe them. The prayer seemed like self-hypnosis into believing. Again another reason for me to doubt. "Blessed are they that have NOT seen and yet they believe." Seems like gullible to me.

Has there been any mention of "dark flow" or the "great attractor" in any of this? Suppose that some kind of dark flow is really happening, could that point to an irregular shape for the early universe? Instead of expanding from a "point" it expanded from an irregular shape like a lightning strike? I was thinking of string theory and the idea of branes colliding, like sheets hanging on a clothesline. When the wind blows they make contact, but not in one point, but over a vast irregular region.

I had Catholic grammar school and Catholic high school. My parents were always devout Catholics. My first problem with believing in god was the fact there were so many religions that disagreed with each other. People fighting each other over religion looked absurd. Another thing that happened was I learned Santa Claus was fake. My mom explained away the nonexistence of Santa as a "spirit that lived in our hearts." I read much of Bhagavad Gita and later Castaneda and thought that spirituality or shamanism was far more sophisticated, and intellectually satisfying, than Christianity. I have been skeptical of all religions ever since. However, apparently many people NEED IT. On my death bed I will TRY to believe again just for comfort, during my last hours. People don't really BELIEVE in religion, they only WANT to believe. Following a religion is not a matter of belief, but social pressure and a WANTING to believe.

Wisconsin was an example of what can happen in November in the general election. The idea was TWO lines, one for cars and one for pedestrians, open 24/7. It takes minutes waiting in line and seconds showing your id at the window. That would be better than waiting in line for hours to vote, spaced 6 feet apart. Why can't everybody have a valid photo id?

Generally, suppressing voting benefits Republicans. What happened in Milwaukee, reducing polling places from 183 to only 5, could also happen in November, unless something changes.

Peter Navarro memo to Trump on Feb 23: “...increasing probability of a full-blown COVID-19 pandemic that could infect as many as 100 million Americans, with a loss of life of as many as 1.2 million souls" The next day, Feb 24, Trump tweeted: "The Coronavirus is very much under control in the USA." "Despite the warnings from Navarro, Trump in the past several weeks has claimed that "nobody" could have predicted the coronavirus pandemic." Trump said on March 19: "I would view it as something that just surprised the whole world. And if people would have known about it, it could have stopped – stopped being in place. Nobody knew there'd be a pandemic or an epidemic of this proportion. Nobody had ever seen anything like this before." https://www.usatoday.com/story/news/politics/2020/04/07/coronavirus-peter-navarro-warned-coronavirus-january-february/2959826001/ Is Trump demonstrating catastrophic mismanagement?