Best fan placement to move air through the house

No joke, this is the old YouTube. Not over produced stuff, but a normal guy having fun and doing Science

This kind of thing is why YouTube exists.

"This experiment is done" You earned a ton of fans with this experiment. Thanks!

This is science guys, this is the enbodiment of curiosity. This is the kind of things and people who got us out of the caves

I have cooled my entire house in the summer like this for years. Pick a window on the upper floor, or at the farthest point from your bedroom. Open all of the windows in the house. Wait until the temperature outside drops below the interior temperature and then turn on that fan and blow the air out of the house through a single window. This will take in cool air from the outside. Then in the morning as the temperatures rise, close all of the windows again. You will be amazed at how much cooling effect you will have without resorting to air conditioning.

This is how I like experiments on youtube. No nonsense, no 5 minutes blabla, just the experiment. Love it!

This guy is out here answering the questions everybody asks, but nobody feels like answering.

This is the Bernoulli effect! Basically, why the windblown section is not a cylindrical column extending from the face of the fan, but rather an expanding cone, is because moving fluids (in this case, air) have lower pressure and thus "pull" nearby fluid particles to move along. So originally, the windblown section would of course be a cylinder, but at the edge of that cylinder, moving air particles pull along stationary particles, and then the now-moving particles also pull another stationary particle and so on until the kinetic energy dissipates. This is also why you must stand behind the line at train platforms because the moving surface of the train will "pull" your body into it.

I am an Italian firefighter, this is the same principle we use to evacuate the fumes from the houses during a fire, the "cone" of air must cover most of the window opening

Racheal: "Do we really have to keep this fan in the middle of the room?" Matthias: "IT'S OPTIMAL! And it's NOT in the middle of the room. It's precisely 52.068cm from the window!"

Thats definitely in the category of „thats exactly what I wanted to see and I didn’t know I needed it in the first place“ Thank you Algorithm and thank you Matthias!

RIP boxed fan. You dedicated your life to science and your research will change the life for generations to come.

This is like overclocking home edition

Just discovered your channel and gotta say I'm a fan.

My girlfriend would tease me about starting an 'Airflow' channel, as I nerded out into seeing how long we could go into summer without air con - you did it my brother! I currently use 2 box fans - one pushing in, the other out, right up against the window, BUT I close the window up to the fan so opening is about the size of the box fan. Moves air decently. Ceiling fans on low to evacuate hottest air. I used incense smoke to find window leaks - don't have a meter or graphing capabilities - nicely done!

I was trying to figure out what's the best placement for fans just by using logic, but quickly realised it's a pretty tricky question and probably needs actuall testing. This video is highly apreciated!

Amazing, thank you for making this. It will solve so many family fights on the best way to cool the house

As a physicist who worked in an office with no air conditioning, this was one of the experiments I had to undertake. Very often I would get to the office at 06.00 or 06.30 and the temperature in the office would be about 28°C. Outside air temperature was about 20°C at this time. Subjectively it was very noticeabble that blowing air out of one window enabled the other window to suck in cool air from outside. --> blow out is best, imagine the ventilator generates a "cone" of moving air which causes other air to also be moved. Aim for the largest vigorous moving part of the cone to be at the window. The next factor was whether closing the windows when the outside air temperature exceeded the inside temperature or whether to leave them open in the hope that there might be a breeze occasionally. --> This was conclusive - keeping hot air from outside out (typically 35°C in the mid afternoon) and the cool air in was best. The last objective factor was avoiding the sun heating objects (desks etc.) inside the office. For this, outside venetian blinds had to be adjusted so that sun did not shine directly on objects inside the office. This made a small but still appreciable improvement. One subjective factor is to use a ventilator to move the air in the office. Actually this should cause a miniscule temperature increase (the ventilator uses a motor consuming non-negligible amount of electricity converting into work, but SUBJECTIVELY the air moving over slightly moist skin feels cool. (But it isn't actually cooler, of course). I use these tricks also at home to ensure my house stays cool (we have no A/C) even though outside can be 39°C. Recently I had a 12° cooler house inside compared to outside. Whether in the office or at home I always make sure I can reliably measure the temperature in all required rooms and outside. Perception is subjective, thermometers are objective! All the best, Rob in Switzerland

Summary for those interested in the experiment result data and conclusion: Circle fan: 3:41 Box fan: 4:44 The conclusion: 5:43

came across this video today - fixed my poor ventilation for the last 1.5 years. even the box fan test helped me understand the difference in efficiency of design. thank you!!!