Best fan placement to move air through the house
ฝัง
- เผยแพร่เมื่อ 29 มิ.ย. 2021
- Experiments and anemometer measurements to figure out where to best place a fan to optimally air out the house to cool it down at night.
More physics experiments:
woodgears.ca/physics
No joke, this is the old TH-cam.
Not over produced stuff, but a normal guy having fun and doing Science
Greedy fascist ruin stuff 😉
You hit it right on the head bro this has that 08 09 feel
the Based TH-cam
having fan
@@supersuede91 i see bajs
This kind of thing is why TH-cam exists.
This and cat videos
no u gay
@@Anudorini-Talah u right I'm no gay
Damn right
@@Anudorini-Talah go away
"This experiment is done"
You earned a ton of fans with this experiment. Thanks!
and broke one!
@@matthiasrandomstuff2221 that would be me
and money
@@matthiasrandomstuff2221ahh the kind of puns I live for, can’t get any better
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
It seems that a lot of people today want us to go back into the caves.
OUT OF THE CAVESSS
This is how I like experiments on youtube. No nonsense, no 5 minutes blabla, just the experiment. Love it!
But he didn't ask to like and subscribe, there is something wrong here. /s
I'm a huge fan of him.
Pure practical, no theory!
@@vitorvs Not asking yourr listeners to hit the like and subscribe button is just wrong tho
I bet, like me, you also hate recipes online that have 24 paragraphs about how they came to discover the recipe and their life story before they get to the recipe.
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
exactly!
cool!
@@matthiasrandomstuff2221 could you repeat your experiment with some simple ducting? Just foam board or something cheap and easy to throw together? I find ducting to be far more important than individual fan characteristics or performance.
@@matthiasrandomstuff2221 could you repeat your experiment with some simple ducting? Just foam board or something cheap and easy to throw together? I find ducting to be far more important than individual fan characteristics or performance.
@@tiporari I had to vote you up that other you guy was getting more than you were.
This guy is out here answering the questions everybody asks, but nobody feels like answering.
I cant bloody sleep due to humidity for weeks, middle of night im wondering wtf to do, moving around the bed and furniture with this new science i learned, thankyou
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.
Basically a whole house fan. Problem is humidity from the outside, unless you are in a really dry place.
I have relied on this technique all summer long for several years now. Northwest United States here, so the weather often gets up to 95° but cools off at night. By managing the windows and fans as you described, we don't even need air conditioning. (Bought one anyway, just in case of wildfire smoke.)
It's especially effective in a tall building, like a two- or three- story house. Once the windows are closed and the air gets still, warm air floats up to the top while the lowest floor is much cooler.
yea what about the humidity
@@dardanpaloka4413 Usually around 40-60% here in the Pacific NorthWest (which is weird, considering our reputation for eternal rain.) That's a critical factor I meant to volunteer in my post. In a humid climate, you just need something with a condenser. Acclimation, shade and humidity matter more to me than the thermometer reading.
@@dardanpaloka4413 It's not a problem out here in the West.
Amazing, thank you for making this. It will solve so many family fights on the best way to cool the house
Ice cube distributed evenly - one in each shoe.
If there’s one thing I learned about family fights it’s that they are never resolved via a TH-cam video
Bring cold air in low and send hot air out up high on the other side of the house
prevent some murders too
@@Bout_TreeFiddy I worked for David Horowitz in Seattle the Civil Rights leader are you related
This actually makes sense to me, In Firefighter training here in Germany we get told to put up a fan at a distance where the cone of wind coming of the fan covers all of the Door / window.
(We use large fans to air out homes full of smoke)
Firemen slowly become phsycopaths. In the top 5 people to not get married to.
I'm guessing the initial air flow drags additional air surrounding it,producing a larger flow at a distance, (I can't remember the name of the effect.. It's not venturi, but one of those. anyway, if the fan is at the edge of window, only the air straight through the fan is evacuated, while the air dragged along is outside air. If the fan is further away, it drags a larger amount of inside air and pushes it outside.
That would be the most logical
@@maximeteppe7627Yep. Bernoulli is the name you were looking for.
@@maximeteppe7627 It is "The Venturi effect" and he made video about it 9 years before he made this video...
th-cam.com/video/Na9ORhYjvJU/w-d-xo.htmlsi=kdDp1AZNLgxYqog4
Wife on vacation "He's probably bringing random girls home while i'm away"
Just discovered your channel and gotta say I'm a fan.
if you are a fan remember to stay 2 feet away from the window
Nice
🤣🤣🤣
@@javierborquez 😂😂
🤣🤣
This is like overclocking home edition
😂
I'm kind of into this tho
I might oc my home's air conditioning
more like undervolting! it seems counterintuitive, but does help performance.
Summary for those interested in the experiment result data and conclusion:
Circle fan: 3:41
Box fan: 4:44
The conclusion: 5:43
It’s to that long of a video, people should just watch it.
@Reibaku this is more for when you come back to it later and want to check specific parts
Ty
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 love how you have no fluff in the video. Straight to the point. Wish all TH-camrs were like you.
True
Right! Most TH-camrs have the 3 min intro music, 5 min explaining what they are going to show in the video, NordVPN segment, then 10 min later they finally get to what the description says 🤦♂️
@@barrioscorona215 I don't think it is right to expect the creatoers to not earning money through ads for their sometimes extremely high quality content, costs and effort they put in to their videos.
With your favorite TV shows you also don't complain about intros. It is just part of the whole thing.
@@Deinecraft You are right about the ads but for sure some TH-camrs have this over the top intro and that can be annoying. I like how this guy's immediately gets to the point. I don't mind the ads but what does bother me is over the top into with the music, then the sponsor and before you know it you're like 6min into the video. Like put the sponsor in the middle or something. Idk but I agree with you.
@@Deinecraft you mean TH-camrs have a right to beg. while real content creators ("aka artist") don't have to try.
Matthias gives the answers everybody wants to know on the questions nobody asked.
thats what an engineer does.
I have asked this on occasion, Australia is a hot place
Until 7 years from now when a celebrity posts on Twitter about putting a fan in the window..then it will end up with 20 million views in 3 days.
I ask it myself whenever it's hot inside 😜
Today I was trying different positions for my fan as well because the air circulation in my room is horrible. Thats why Im very surprised that this gets suggested to me.
This is pure TH-cam experiments. Exciting, motivating, sweet and simple.
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!
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!"
@Ken Mason She will return when she realizes how hot that place is compared to his :D
Sounds like a big bang theory skit XD
🤣🤣🤣
I'd say 520.68 mm.
@@antraxxslingshots No, because they have a working air conditioner.
When I was a kid living in Austin, TX, we had no AC and brutal summers and we used fans for cooling... I’d turn the sheet on my bed into a diamond shape and tuck the corners under the mattress, leaving gaps on the straight pieces of top sheet, tie the foot end of the sheet to the handle of the box fan in the window, and turn the fan on. It blows up the sheet into a tent, circling the cool air around you (especially great at night), but the gaps allow some air to escape so the sheet won’t blow completely off the bed.
TLDR; livin in the year 3000 back in 1978
A picture of that could have great cyberpunk 2077 meme potential, at least if it looks like I’m imagining right now
@@kenoalbatros With the music, I can also see it.
@@kenoalbatros reminds me of the pug farting on the fan in random granny's bed tent
I need a visual of this
Really need a picture of this magical arrangement
Hi Matthias ! Last summer (July 2022) I did the same kind of experiment! And find about the same results. My fan was one of those tall 5' on a pedestal 18 inches blade. The best distance was about a meter and a half from the window. Since air acts like a liquid, one has to think outside the box. ( or outside the fan cage in this case) From what I gathered is that those fans dont pull air much from the back but they actually create a turbulence around the cage that pushes the flow instead of a coherent vortex. (like a turbine) I am happy to see that someone actually did a better scientific approach!
I'm trying to find one where the results include blocking the window off where the fan is. Blocking the edges so there's no leading back draft. Whenever I put a window in a fan I always block the unused portions of the screen off.
@@CalvinHikesI imagine that does improve air flow, but not by a significant amount. Probably the difference between .6 and .7 ish
My floor fan rotates so I put it in the corner of the room so it's not always pointing straight at me.
The turbine analogy helped me understand better, ty
It's not as powerful as I thought it would be, but it works very well. th-cam.com/users/postUgkxGjG43--gYqIoT4Xkur2PqCrtbKwTv2h6 There are three options to circulate air, and best of all a remote control for us lazy people. Installation was a breeze (no pun intended). It actually took longer to open the box then it did putting the side extenders on and sitting it in the window opening. It's a perfect alternative when you want airflow, but not the AC. Just might order another one for a different room. UPDATE: Bought another one like I said. They work great. Why not have two...
it's not 2ft from the window though so much more inefficient. This is why exhaust fans attached to walls don't really help much
Now here's a man who has never uttered the words "I'm bored"
A rather harsh motivation that was thrown at me during my childhood: "Only fools are bored."
This guy is the type of person who really makes you question all the time wasted by doing nothing but saying you're too busy xD
I’d argue he says I’m bored all the time. Otherwise, why would he start to ponder optimal fan positioning and the need for actual science confirmation if he were already sufficiently stimulated.
04:58 Only funny part is.. oh great experiment over.🤣😂🤣😂😅
I think there's two types of boredom:
1. "I'm bored nothing satisfies me"
2. "I'm bored, time to find some thing to do."
The second one only lasts a moment.
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
I am no physicist, but woul'd moving air not increase the evaporation and so cool the evaporation surface/ object (in this case you), so it would not be a subjective feeling, but an actual cooling effect for humid objects?
@@rabenklang7 This is true, and it's not just caused by evaporation. Air directly next to the skin is generally much warmer than room temperature (if ambient temp < body temp) which means that blowing air over the skin will replace warmer air with cooler air. This is why wind protection is important in cold weather; still air is an excellent thermal insulator, but it only works if you can actually prevent air next to the skin from flowing (which would otherwise quickly result in convective heat loss).
Born and living in a tropical, hot and humid country.
I can confirm ventilator fans, or just moving air in general is really good for skin feel.
I think slightly drafty indoors is something people living in temperate climates need to get used to and incorporate into their culture (global warming). I was so surprised when I holidayed in Europe and there were no fans (or air-conditioning) at all in the shared Airbnbs, it's fine in cold weather, but summer would be a broiling torture.
A lot of people think that no matter what, no matter how blazing hot it is outside, opening your windows will keep it the coolest inside
@@rabenklang7 Yes but the room wouldn't be cooler, thus it being subjective (subjective as in relation to the room - as "what/who is it impacting" and not the general room temp)
For example, chinchillas don't sweat like us thus air flow does not cool them down. So cooling down the whole room is needed. (As opposed to just cooling you down)
A few years ago I built a fan with a tight enclosure to fit in a window, effectively sealing the window off. With only a few mm between the fanblades and the enclosure, it draws quite an airflow.
Definitely not an ordinary fan!👍🏽
@@head85 PC cooler fan or similar, most likely. Those are the easiest to mount onto a wooden window insert, as they come with screw holes. You can even get larger models, e.g. 200mm instead of the most common 120mm, meaning you can spin them slower (reducing the noise) while moving more air.
@@EvenTheDogAgrees my fan (and it's "enclosure" (not sure how to translate it in English)) is built into a wooden insert, just as you described. The only difference is the fan itself. It's an industrial grade 230V fan of about 500mm (no typo) and draws well over 3000m³/h. 🤣 When it was still in use, I usually ran it at about 40% capacity to avoid complaints from my neighbours across the street 🤣
Trust me, I've been laughing my ass of after I turned it on for the first time. Up until then I just didn't have a single clue what it would be like to have a fan blowing 3000m³/h of air through my apartment 🤣🤣🤣
@@Sierra-Whisky LOL, that's epic! Thanks for the laugh! 😂
This channel is one of the few reasons TH-cam is still worth while.
As someone who sleeps in an attic room with no air con this is vital data, thanks.
RIP 💀
@@moviemania1137 He's still alive wtf? Get back to work pudding
Bernoulli's principle
odd wording considering were in a pandemic rn 🤣
Same 💀
Fan placement really does make a difference. I live in the desert and it’s very hot here during summer. My ac is in a bad location in the house so I have to use fans to pull the cool air throughout the house. I have spent days and days moving fans around to find the perfect configuration for maximum cooling. One fan out of place and it will get hot, in the right place, I can stay 75 on a 100 degree day. There are a lot of factors and every home is different. Experiment with your fans! Move them all over the place, you will find the best spot. In the right location a fan on low can really help keep you cool.
I do the same experiment the problem is that I have a ceiling fan and it cannot be moved, so to have the better freshness I'm the person who has to move 😅
100 degree Fahrenheit or Celsius?
@@EngerJimenez are you considering boiling yourself? no, not celcius, hopefully
@@EngerJimenez I kinda doubt you'd survive being in 100 Celsius so assuming Fahrenheit
@@KilleRoy_NL I doubt you would even survive anything above 45 c°
No joke, this guy proofed that I've done the right measurement for my room! I'm living in a very small room usually closing the door with only fan and not air-cond, the room temperature was really hot when the weather is hot and I tried to turn my fan towards living room with door opened, and it result in getting more cold air in my room instead!
Thank you for doing this air circulating science stuff! I was so excited when I found that someone actually do this to collect data!
I wonder what is the distance between your living room towards your room?
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!!!
dude its summer and you just made my bedroom noticeably cooler
Buy an ac
@@Grandpaneedsblood there are a few downsides with using an ac
@@WhiteCranK wat r they then genious
@@Blernster wasting electricity, the cooled air isn't healthy and make headache and/or throath diseases, they're loud and need a lot of space... "genious"
@@Blernster climate change
Remind me of
Pre-2014 Old School TH-cam,
No flashy Shorts, No Over Commercialisation , no extra spicy editing.
Just Pure Knowledge and experiments ❤️
And the icing on the cake...no clickbait thumbnail featuring a silly reaction expression!
“Pre 2014 old school”
Lol old school for TH-cam is literally almost ten years before 2014 my man
no vpn sponsor, no money begging, no social metworks
@@AMediumSizedKodiak lol yeah, real old school is pre 2010, that’s when TH-cam was completely different
there's loads of videos like this that are straight to the point, you only get 'commercialized' videos with 'spicy editing' because youtube looks at your watch history and gives you videos based on that. so if you don't want those kinds of videos stop viewing them.
Had to comment again to express thanks, I've now shared this with numerous people who don't have A/C during the current round of heatwaves, so thanks so much for helping keep so many people cool!
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!
This is an AWESOME experiment!
😥
Best of the experiment was 4:57
@@repentandbelieveinjesuschr9495 Matthew 4:10 "Away from me, Satan!" Jesus declared. "For it is written: 'Worship the Lord your God and serve Him only.'"
My name🙂
Finally a to the point test with clear testing and results without 5 ad breaks and sponsor shoutouts for testing the best plastic bag to paint your doors with. Thank you.
Yeah, actual testing being done and results shown. Refreshing
Would be great if your sentence had an ad break...
That's because TH-cam, not the uploaders
I'm now really curious about the bag. How could I possibly paint my doors with it?
I love these independent experiments with useful information
Thank you for this. I have 1 pedestal fan and a floor fan and have been experimenting on how to get the greatest air flow in my house. Simply moving the pedestal fan 2.5 feet from the window and using it to vent has given me the best cross breeze I could ask for
You don’t search for this.
We shouldn't need to.it should appear
I wonder what kind result a Dyson Airblade would get
Yes I do lol
I did 😂
this searches for you
Just coming back to say that this has made our lives better already. We've been using fans all wrong and this makes a massive difference. We can now be comfortable in our apartment on hot days and it feels amazing. Thank you, thank you, thank you.
I use fans to blow wind at me lol
@@9razzler9 its logical 😂
@@9razzler9 you can do both at the same time! Cool your house and yourself. Just need a few fans.
Then be amazed if you made a simple cowl for it...
I live in my room with my dog, and I do this to air out his smell. This was very useful information and I immediately noticed a difference when I moved the fan a few feet from the window. Thanks!
RIP boxed fan. You dedicated your life to science and your research will change the life for generations to come.
Hi sir. I want to thank you from the bottom of my heart! This tip solved a big issue for me and my family. We hated summer times because we had trouble sleeping in our apartment. I have a quite powerful AC which does the job, however it was drying the air too much and my little daughter was having trouble with her throat. We got quite a qood humidifier but it didn't do much.
... but man, this tip, I tried in and it made the temperatures ideal for sleeping without sweating. It's been 10 days since I implemented it and in all of them we slept without any issues!
Thank you a million times and God bless you good sir!
Goes to show you may never know how much of an impact a simple curiosity experiment may have on someone else's life. Thanks for sharing.
This comment ❤
Thanks for sharing
summer nights no need to turn on the AC anymore? : )
@@piggnant 😐
Trust anyone with a raspberry pie laying around for experiments.
I love the way you hooked up those devices and experimented with placement. I admire your skills! I’m watching this from England, where the weather is just warming up.👍
This totally works, I saw several videos of this in the past and tried it myself. I didn't do all the air speed tests, but it changes it from taking an hour or more to cool my room with only a slight temperature change even when it's like in the 60s outside to bare minutes. Obviously the colder outside the faster and bigger the effect, but just the shear difference between having the fan in the window sill versus like 2-3 feet back made a huge difference in cooling my room. A whole house would be slower since it's a much greater volume of air that has to be moved but it would still have a much greater effect.
My basic understanding of the reason is basically that by putting some space between you're increasing the volume of air from inside that can be pushed outside, that with the greater space more air will flow faster into that space than will just flow into the back of the fan.
This methodology is what we need to be teaching in schools.
You mean the scientific method? The one that is taught in schools?
@@ateryx the idea of the scientific method is covered, but it's application in the real world is rarely talked about. we're just all suppose to "trust the experts" and if we use the internet in any way to get our information, it's faulty and "unofficial"
@@pinefilms3141 Maybe you slept in science class? It is definitely talked about and used in schools. Remember, research is only the FIRST STEP in the scientific method.
@@ateryx the scientific method has fallen out of favor. Now you believe the science, or you're a science denier.
@@ateryx I think you need to work on your reading comprehension, kiddo.
My father, an civil engineer, was doing this experiments back in the 60's at our house. It was a big house. Finally he sealed/placed the fan in a stair way window and kept the inside doors in a closed circuit, porch to kitchen, to living room, hall way and ending in master bedroom. We never had to run the AC until June then only in the afternoons. (Atlanta GA area).
😂😂😂😂 no need to be an engineer, i have done better
@@eggbenedict-gt7mw No you don't 😂😂😂😂
@@eggbenedict-gt7mw First of all he said his dad was a civil engineer, not that it was required, but that distinction probably went over your head. You're so desperate for attention you replied a comment without data, and said you did better, despite it being impossible to prove that.
My granny also lived near Atlanta. She always put a box fan in the front door. In the daytime, she would have it blowing outward to push hot air out. In the evening, she would turn it around to pull cool air in. She never had an air conditioner and it was always relatively nice inside her house except on the hottest days of summer. It helped that she had two massive oak trees shading her house.
He could have been a good youtuber and shared the results if there had been youtube in the 60's!
Sir, your commitment and follow through on your musings is highly inspiring.
I was troubling over this question just last week. Very good video. No "educational" bloat. Just good solid content. Thanks!
Believe it or not, I've discovered this about 2 years ago by accident, I was cleaning my room, and my intention was to pull the dust outside by putting my fan facing my opened door and about in the middle of the room. While cleaning I noticed that my room was getting cooler and cooler over time.
So, how old were you then when you discovered airflow?
@@Brandon-bc5um 37
@@Brandon-bc5um that question made me laugh 🤣
@@Verdeniza ikr 😂
But this has nothing to do with how far the fan placed from the window
The fact that he took time out of his day to do a detailed video of something we needed is beyond great.
Two days actually!
Enjoyed this. This is the kind of quality content I’ve grown to forget. Sometimes TH-cam algorithm does good things.
During hotter days with no wind, we have window fans in every window upstairs exhausting air out, mid level windows closed, and basement (half underground) windows all open. Basically creates a draft from the basement to upstairs and that alone will drop the temp instantly and maintains a nice draft in the house.
We use this in the USA to ventilate houses in firefighting. Back the fan off the opening just enough to where the cone of moving air from the fan cobers the opening. You can take another fan, put it outside on the other side of the house and have it force air into the house. Again you want to back it away from the opening far enough for the cone of forced air to encompass the entire opening. Also, all other windows and outside doors have to be closed for it to work.
Are you trying to burn the house down faster?
Did you think that sounded smart? It is obviously used to ventilate smoke AFTER the fire. I don't know if you were trying to sound funny with your comment or not, but instead you showed a clear lack of practical sense, and an aptitude for stupidity. There are other methods of ventilation used in active fire situations btw, but I don't think you would care to know by your comment.
@@dakotamartin1621 i think it was a joke lol
@@whoisisaac im sitting here like "isnt he describing those backdraft rooms?"
i thought dakota was trolling til the end
Thanks for explaining it so well. Fellow firefighter here, can confirm this is how we ventilate a building. There's a lot of research on this so we see it as part of our training, and it is very interesting to see it work for yourself.
and im impressed by those big digit console output.
I often sneak a cigarette at home and I must say that placing the fan in the middle of the room in comparison to right next to the window has yielded better results for me. I point the fan straight at the window and use the full power mode and the cigarette smoke and smell clears within 5 minutes. The best results occur when a second window is opened directly behind the fan.
Too good! As someone slightly obsessed with using fans efficiently for total home air exchange…this really hit the spot.
At first i did not believe this but gosh I couldn't believe when i started to feel the air circulation inside my room, thank you very much for your wonderful video, sending hugs and kisses from Philippines
tropical country :(
@@mr_coffee0508 yes I live in Philippines, sadly I can't afford to buy aircon, so thid method really made a huge difference compared to not doing this technique
As many people have said, it seems to be a result of the flow of air pulling more adjacent air out the window along with it. I think this is the bernoulli's effect, which you can look up someone blowing up a large bag with air in one breath because of the same principle.
Exactly, that's correct.
I believe its air entrainment.
you get some nice entrainment, and you also manage to stop most of the air from coming back in through the same window again
Yup, I remember my science teacher showing me that effect in grade 9
This is related to Bernoullis principle. Locally increasing the air speed decreases the pressure, leading to surrounding air streaming into the low pressure region. If you place the fan directly in front of the window the same happens, but the surrounding air will be on the outside, rendering the fan useless.
Tis video is amazing. I've been testing methods in my appartment for days now. The best one so far made for a slight breeze. This method had the 1 fan right up against a window. I decided to move it back about a meter and now i am blowing of my couch. Thank you so much
Humble, fair, polite, honest and I can go on until tomorrow, the world needs more people like that to make it a little more pleasant to live on earth. Thank you !
I love the fan research, we need more citizen science! Measuring air flow is one variable, but another important metric would be the change in temperature with different fan orientations.
This! Temperature and humidity is what matters I suppose to the occupants!
There would be too many variables for anyone to apply the data to their own situation. This video is good because he measured a simple metric that anyone can understand and means something no matter what your situation is.
The more air you move the better.
For temperature It all depends on how hot it is outside and how hot it is inside and how many windows you have available and so on.
from experience if the outside temp is cooler than inside, if your using a fan the fastest way to cool the inside air is to blow outside cooler air in.
blowing air out is very inificient in the same conditions for cooling.
My guess is there is a causal correlation between amount of air you can exchange and the delta between the two temps you are comparing (inside/outside air). Could probably work something out knowing those numbers. My guess is more air exchanged, the quicker the delta's converge.
Really gotta appreciate people who go out of their way to make good content like this
I remember watching this video when it first came out. Was lucky enough to get recommended it out of nowhere. It was a nice change of pace. Now, I'm trying to setup some cross ventilation in my home and I kept thinking of this video. Everything comes around eventually.
This is one of the most informative videos I've seen. So simple but so complete. All hail TH-cam and people like this guy!!!
I installed a large fan in the apex of our attic.
Not only does it remove the hot air in the attic, it pulls the cool evening air into the house and cools every room down considerably.
Attic fans work! 👍
I used to live in a house with a big extraction fan pointing into the attic. It was noisy but the breeze through the house felt great. Is your attic fan purpose built for being in an attic? Did you have to add any ducting or vents?
I put a solar power attic fan in my roof over the shop. Before the fan I monitored the temperature in the attic space with an indoor/outdoor thermometer. I kept the indoor unit in the shop and the outdoor unit I stuck in the attic. The temperature exceed 140F any day the ambient temp was over 85F. This made the ceiling of the shop which is insulated hot. After installing the fan the hottest is has been in the attic is 126F, so about 20 degrees cooler. I have noticed that the temperature in the shop stays about 5 degrees cooler than before the attic fan was installed. Solar powered so only works when the Sun is out but hey that's when it's hottest so it all works out.
@@nefariousyawn
Yes the attic fan was purpose built for being in the attic. (30 inch diameter 4 blades)
It came with a round cowling that installs in the apex. I removed the extant square vent that was built with the house and created a round hole that fit the cowling.
I sealed everything and then mounted the fan. (the outside of the cowling has louvered vents that close when the fan isn't on.)
I installed a wall mounted switch for the fan in the hallway underneath so that we can manually control the fan. It also has a thermostat that can automatically control the fan when attic temperatures exceed a set point.
The fan is quiet and it has an oil port for lubrication which I oil every spring.
@@bobd. Sounds like you have a good solution for your shop! 👍
@@skippylippy547 I’m just researching options in Canada ... what brand did you install?
Years ago in a non-A/C house in MN I made a plenum that I could hang in the top sash area of a window and the box fan would set horizontal on the thin wooden plenum about a foot from the ceiling. That exhausted and pulled the hottest air from the ceiling and pushed it outside. Worked wonderfully. Better than any other implementation I tried.
cool. I'm sure that got lots of questions from visotors!
@@matthiasrandomstuff2221 It actually looked nice. I made it look nice. Triangular cross section if looking from the side and guiding the air towards the window. This allowed me to walk by the window without hitting my head. Remembering now, it only fed and fit the top half of the top sash. Not that noticeable from the back yard. :
That's pretty clever.
@@oscargr_ Thanks. It worked so well I used it for years. I could close the top sash without removing anything and it fit in place without any fasteners. I showed it to the people that bought that house from me and they chose to keep it.
That's the right way to ventilate. Hot air rises.Vent out the warm air near the ceiling so that cooler air can come in to replace the exhausted warm air. For the best result you need cross room ventilation.
i remember watching this a couple years back, and it still helps me to this day 🙏🙏🙏
I love the engineering discipline you use. This is really useful stuff! Thank you
This effect can be demonstrated fairly well by using a fog machine to visualize the airflow.
Or use a whistle-blower!
Or by setting your house on fire. If the flames are getting bigger it means the air flow is good
@@usbgamers123 about to set my house on fire to test the air flow, thanks for the tip! 🙏
@@usbgamers123 you are a genius
I always pointed the fan out the window to help air flow, not sure why done this, it just made more sense to me that way. Now I have the data to prove it! :D
Pointing a fan inward makes the fan increase the air pressure to get hot air out, pointing it out doesn't change the pressure outside to any appreciable degree.
Love that you did the math.. I kind of reached same conclusion trying to move air from front door to back door, i.e. pushing at the backdoor at ~1meter distance seemed to do the most
That was some detailed experiment, and very useful, I've always used the fan the wrong way, having it blow inward, which is terrible, thank you sir!!
"I love clean data." I felt that.
Dude, this is like one of the best expriments I've ever watched on TH-cam. No nonsense, clear data, love it!
I watched this eons ago. I had to search for it again because I couldn't remember the results of the experiment. Great stuff.
I’ve never seen a YT channel as entertaining as this one before.
Every 40 year old woman: WHAT GOOD IS THAT I NEED IT BLOWING ON ME
And then they think that cools down the house
Not going to lie this is one of those things that, to most people, might seem benign but it's really interesting.
This is why ducting on fans is so helpful.
Subbed.
Placements + size + fanpower+ shape of room +
This is incredibly insightful for us fan users. Thank you for your work!
I have an outside generator shack that has to be ventilated when the generator is in operation. The ventilation is needful both to cool the inside of the shack (and thus the cooling air available to the engine) and to supply fresh air for the engine to use for combustion. I've been playing with/experimenting with fan placement trying to figure out how the best airflow is accomplished. Preferably without sucking exhaust fumes back inside the shack. The information in this video is very useful towards that end. I have no way to gauge the airflow in and out of the structure. Thank you for taking the time to put this together.
Nice work, Matthias. Patton, a fan manufacturer, recommends this in the literature that came with a fan I bought several years ago. As you have found from experimentation, best air exhaust from the house is blowing out from a distance from the window. Their illustration appeared to suggest a column of air being blown from the fan out the window central to the window opening, and other air current being invited to join the column going out the window. A turbulent column inviting some surrounding laminar flow ambient air out with it, if you will. A larger net effect VS placing the fan right at the window opening and only getting the column of air exiting the window. I have found that effectiveness of this strategy varies somewhat by fan setting. If I don't want as much air flow through my place, I turn the fan to a lower speed, and air flow goes way down. Then I move the fan closer to the window and air flow recovers a bit.
An interesting variation on your experiments might be to establish a baseline air flow with the fan right at the window at max fan speed, then see how much you can reduce the fan speed with optimized distance from the window, to achieve the same baseline flow rate.
Thank you
Entrainment.
My favorite thing about this video is that each time I started thinking "but what about..." you jump in to adjust and account for it, throwing in a concise explanation as a bonus. So good!
what if the anemometer is backwards thats ehy it didn't spin for (fan facing inwards)? unless does the device works on both directions??
@@hereandthere4751 I think it does work in both directions, since wind speed is a vector, it's just that it would spin backwards and maybe show up a negative reading
@@hereandthere4751 fan facing inwards does nothing for circulation cuz it can only suck in air that is right behind it and the wind it generates is immediately lost
I have a home from the 1800s and there are two well placed windows that allow for airflow through the house. I use window fans that are sealed around the edges that can blow air in or out. At night, I'll have the east and cooler shaded fan blow in and the west fan blow out and the combination moves a lot of air very quickly. I notice a significant drop on temperature in that configuration. I'm sure airflow measurements would be quite telling. In the morning, i could reverse the fans blowing and i sometimes do, but I'll usually close the windows and curtain the house and it'll stay cool until night and repeat the process. Air conditioning isn't even necessary unless it's really horrible
This video follows the Bernoulli's principle
If you dont know how this works just youtube another simple experiment
or what it does it as the air you blow follows a laminar flow the surrounding air also gets involved in the flow and flows through a given path
Hope this helps❤
The thing happening here is air multiplication, vector augmentation, or entrainment. It is used for very high volume pumps, like bilge pumps and the air pumps that instantly fill the emergency slide for planes.
Thank you I scrolled down to find this!
Yes, based in Bernoulli theorem....just like a venturimeter
Been doing this for years just on a hunch from my fluid dynamics days that it was probably better. Good to see some actual data! Thanks for sharing it.
I love it. Ive always wondered about this kind of thing because I love a house with a good air flow. Ive been doing it wrong the whole time! Thank you for this.
Thanks, really appreciate that there is no extra comments, only the essentials. And that would help a lot here!
Something tells me he just had a huge fight upstairs with his wife.
"See, I told you. Watch this video I made to prove you wrong."
@@aloseman There are some arguments it doesn't pay to win, even if you are right. What Matthias could REALLY use is another person to replicate this so he could point to THAT video and the other person could point to HIS video so that way they aren't in as much trouble with their respective wives as if they had pointed to the video they made specifically to prove their spouses wrong. :P
@@redemptusrenatus5336 genius
And yet some feminists believe men always win the arguments
@@Layput why tf do ppl have to bring politics into shit all the time
*He actually did it*
What a legend, doing the experiments we all want
I have no ac in my home and every year I end up putting fans in different areas, and hoping it will keep me cooler than the year before. Now I know where to put them to be the most efficient! Thank you so much!
Today ive spend 4 hours watching TH-cam and your video is the only one ive found genuinely interesting and would affect my life.
This will be really helpful when I move back to Europe next year. Normally no AC, so to keep your house somewhat cool during heatwaves you kind of develop a strategy/timing of when to open and close windows, shades, etc.
Playing this exact game right now :)
They make this wonderful invention called a portable air conditioner it was designed for houses that do not have central air conditioning
@@iair-conditiontheoutsideai3076 They are inefficient and have variable loudness when compressor is turning on and off. That's why I finally moved the whole thing outside and I'm sucking air from the room through a hole, moving it through the evaporator and back into the room through another hole. Well-insulated hoses, silent compressor, better efficiency.
@@radekoncar2404 yeah if you want to go that far with it considering most these people don't even have air conditioning I think something would be a start for them
@@radekoncar2404 Did you move a portable unit outside? If so..I'm listening!
One big reason putting the fan far away from the window works better is because of the Venturi effect. When the air speeds through space, it creates a low pressure zone that pulls in more air around it.
I think the viscosity of the air pulls along more air as well. Don't quote me on this though since I'm not an expert.
If someone else knows more about this, feel free to elaborate on it :D
@@AnimilesYT Ya i think thats Bernoullis principle
@@flaco1010 Venturei effect and Bernoulli principle are pretty much the same thing, you can explain, mathematically, a Venturi effect model with Bernoulli's equation.
@@minimovzEt ahh interesting. Time to do some more research :)
Agreed. In fact I was going to put the same thing in the comments but you apparently beat me to it. Also, wrt his video, not all fans suck air in from the outer front perimeter and blow it out from the center. I have a fan that doesn't do that. It depends on the design of the fan. As you said, it is still desirable to have the fan a certain distance within the area that you are trying to blow the air out of because of the Venturi effect. I believe those respirator pumps also utilize the Venturi effect to maximize airflow as well.
I love it when the data supports my experience. Good Job
I used your research to cool off my bedroom before going to bed tonight. I put the fan about 2' from the window and it worked perfectly. Thanks!