137
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
this post was submitted on 10 Jul 2024
137 points (100.0% liked)
No Stupid Questions
35810 readers
1030 users here now
No such thing. Ask away!
!nostupidquestions is a community dedicated to being helpful and answering each others' questions on various topics.
The rules for posting and commenting, besides the rules defined here for lemmy.world, are as follows:
Rules (interactive)
Rule 1- All posts must be legitimate questions. All post titles must include a question.
All posts must be legitimate questions, and all post titles must include a question. Questions that are joke or trolling questions, memes, song lyrics as title, etc. are not allowed here. See Rule 6 for all exceptions.
Rule 2- Your question subject cannot be illegal or NSFW material.
Your question subject cannot be illegal or NSFW material. You will be warned first, banned second.
Rule 3- Do not seek mental, medical and professional help here.
Do not seek mental, medical and professional help here. Breaking this rule will not get you or your post removed, but it will put you at risk, and possibly in danger.
Rule 4- No self promotion or upvote-farming of any kind.
That's it.
Rule 5- No baiting or sealioning or promoting an agenda.
Questions which, instead of being of an innocuous nature, are specifically intended (based on reports and in the opinion of our crack moderation team) to bait users into ideological wars on charged political topics will be removed and the authors warned - or banned - depending on severity.
Rule 6- Regarding META posts and joke questions.
Provided it is about the community itself, you may post non-question posts using the [META] tag on your post title.
On fridays, you are allowed to post meme and troll questions, on the condition that it's in text format only, and conforms with our other rules. These posts MUST include the [NSQ Friday] tag in their title.
If you post a serious question on friday and are looking only for legitimate answers, then please include the [Serious] tag on your post. Irrelevant replies will then be removed by moderators.
Rule 7- You can't intentionally annoy, mock, or harass other members.
If you intentionally annoy, mock, harass, or discriminate against any individual member, you will be removed.
Likewise, if you are a member, sympathiser or a resemblant of a movement that is known to largely hate, mock, discriminate against, and/or want to take lives of a group of people, and you were provably vocal about your hate, then you will be banned on sight.
Rule 8- All comments should try to stay relevant to their parent content.
Rule 9- Reposts from other platforms are not allowed.
Let everyone have their own content.
Rule 10- Majority of bots aren't allowed to participate here.
Credits
Our breathtaking icon was bestowed upon us by @Cevilia!
The greatest banner of all time: by @TheOneWithTheHair!
founded 1 year ago
MODERATORS
This is the wrong application, noctua are looking for static pressure, what OP wants is to maximise airflow. Mathias wandel has some pertinent videos on the subject, the ideal is a large fan about a metre or two away from the window, depending on the size of the fan, blowing hot air outside.
Why so far from the window?
I think you get the benefit of the airflow pulling in air along its edge to push out with it.
Like pushing a bunch of water with a broom removes not only the water in front of the broom but also more water due to surface tension and inertia
It's called the venturi effect.
It's called the linguini effect.
Ohhhhhh the bernoulli effect?
no no, it’s the Magnum effect.
Good ole vermicelli effect
In this case it's called the brunelli effect
Ah yeah, the Dom Mazetti effect
Its called the Chimichurri effect
The Bozzetto effect?
It's called the kimchi effect
It’s called the butterfly effect.
Oh yeah the bruscietta effect
It creates an effect where surrounding air is pulled with the stream due to the Bernoulli effect. It's the same thing that pulls shower curtains in when you shower. If the fan is a bit inside the window, surrounding indoor air gets pulled into the stream, moving more air out in total.
Most of the replies are correct overall. But Mattias Wandel had identified another important factor. Fans don't just "stuck from the back" and blow out the front. They sort of suck from everywhere including the edges. This means that if you're putting a fan right up against the window blowing in you're sucking some room air as well. If you're putting the fan right up against the window blowing out, some of the air you're blowing out comes from outside in the first place.
The ideal is then to blow out from 2-5ft away. This way all the air that's blown is room air, and it's all blown out. The venturi effect plays a small part. The Bernoulli effect? Equations? Explains why the air stays in a "tube" for a few feet away from the fan. Technically also explains the venturi effect..... Everything is Bernoulli....
https://www.youtube.com/watch?v=1L2ef1CP-yw
This was a wonderful comment to read and video to watch, thank you
A fan creates kinda long "channel" in front of it and behind it, where the air is moving rather fast (at the speed that the fan creates). Imagine the narrow beam of light from a flashlight. You want that channel to go right through the window to have a good amount of air flowing.
I don't know that you need to keep a distance from the window. I think 1-2m is just more practical than having the fan right inside the window frame.
do you happen to know whether this is significantly different for a blower-style fan that has its air intake on one side? for example
https://lasko.com/collections/air-movers-blowers/products/lasko-12-pivoting-pro-high-velocity-utility-blower-fan-with-3-speeds-u12104-gray
I don't know the type, so I am judging it from that picture.
It shows a rather small area where the air comes out. I imagine that it creates high speed, but the "channel" would have the exact same size and shape as that small area where the air comes out. So I'd consider it as less effective.
A fan with a large diameter could probably move more air.
No, it should be roughly the same.
The thing you're trying to take advantage of when placing a fan a meter or two from a window is that when you have a moving mass of air and it passes by static air, it "drags" the static air with it. As a result you move more air mass that what was blown by the fan directly out of the fan blades.
A blower fan still blows air in a direction, and can likely take an even bigger advantage than a traditional box fan since a blower fan's output direction will be more orderly aka closer to a laminar flow than a box fan. But the real advantage of the blower style fan is that its enclosure allows you to direct both the intake and exhaust portions of the air being moved.
Same reason why blowing on your hand close to your mouth is warm, but farther away is cool.
Can you explain that? With one fan pushing air in, and one fan pushing air out, you should be achieving higher airflow than you would with a single fan pushing air either in or out. Especially if you only have the one window open. I know that when I open windows on both sides of my house, I get better airflow than if I have windows on only one side open.