Yuki 3D printed Airconditioner (now called Yuki Air Cooler) - Page 1
Forum section: electronics / general

author: helio0centra@gmail.com
author_rank: Contributor
timestamp: July 14, 2022, 09:42:09 pm
content: This is just another one of those ice to water swamp coolers. Does not evaporate because you are meant to use a bottle of ice and there's no wick.https://yukiairconditioner.com/Using just a 80mm 5v fan it isn't gonna provide much cooling either. Maybe enough to give you a cool breeze on the face or hands of you have it on your computer desk. And since your freezer probably dumps its heat in your living space you will overall be making your house hotter if you 3D print or buy a premade one of these. Because there's always losses in every circuit.Promo video:downloads:https://www.thingiverse.com/thing:4923823https://www.thingiverse.com/thing:5431054The new version just has a snowflake embossed into the side.

author: thm_w
author_rank: Super Contributor
timestamp: July 14, 2022, 10:16:14 pm
content: Why go to this much effort marketing it then give it away for free on thingiverse? I guess its a student project.To me the cooling part is not super dodgy. A 80mm or 120mm fan can provide decent cooling if its directed appropriately, at a computer desk as you say. Dodgy for me is because it will probably grow mold and be difficult to clean (printed PLA surface can easily harbor bacteria).This is a good fan duct if anyone needs one (copy of a Noctua design):https://www.thingiverse.com/thing:4912018/filesAnd apparently soaking your clothes is better without a fan? weird:https://pubmed.ncbi.nlm.nih.gov/32027545/

author: PlainName
author_rank: Super Contributor
timestamp: July 15, 2022, 06:05:56 pm
content: QuotePerhaps many people don't have a 3D printer, or just prefer someone else to do the boring stuff if it's cheap enough. Making it available also shows it's 'real' so would perhaps attract those who are sceptical, and if they then elect to buy instead of build...Could actually be a clever marketing gimmick!

author: SiliconWizard
author_rank: Super Contributor
timestamp: July 15, 2022, 06:39:43 pm
content: All those things are just shit.The evaporative ones do work, kinda, on some level. Of course. The principle is nothing new. Evaporating water is an endothermic process.Problem is, in such a tiny volume and air flow, it's just going to blow fresh air very locally. Like, right into your face. That's all.As to the downsides, they are many: the higher the relative humidity, and the less it cools down air. If you live in a humid area, forget about it. It won't even blow fresh air. If it's very dry though, it will. With similar devices, I've measured like 15°C, at 20-30cm in front of it, in a dry room (around 30% RH) with 30°C ambient. With like 60% RH, which is a lot more common in summer in many countries, the "efficiency" drops dramatically. In any case, it's just going to make you feel fresh air very close to it, it's never going to drop a single °C in any room, even very small one.Another downside is of course bacteria growth. There is from very limited to absolutely no filtering in those devices, so it'll grow bacteria very fast and will just blow that right into your face. Not something I'm very fond of.Another obvious side-effet is that as it evaporates water, it will increase the RH in the air around it, which means, back to the point I made above, that after a while, the efficiency drops even if the room's air was initially very dry.The difference with the "window evaporators" is that those have at least one side that faces outside, while those tiny evaporators are entirely INSIDE the room.

author: helio0centra@gmail.com
author_rank: Contributor
timestamp: July 15, 2022, 10:43:20 pm
content: Quote from: thm_w on July 14, 2022, 10:16:14 pmAt 12V they can, at 5V they are pretty gutless, and this is meant to be run by USB. You could instead wire in a JST 2/3 pin fan header, or a DC barrel jack or something to feed in 12V and it would give a much better breeze.

author: thm_w
author_rank: Super Contributor
timestamp: July 15, 2022, 11:11:24 pm
content: Wasn't expecting 5V operation, yeah, if you want to use on a laptop etc maybe this would be suitablehttps://www.aliexpress.com/item/1005001876930158.html

author: PlainName
author_rank: Super Contributor
timestamp: July 16, 2022, 01:02:06 am
content: I have a fan very similar to the one below. It runs off USB and the output is pretty good - easily powerful enough to be annoying! I used it attached to the front of an exercise bike to get a bit of airflow for cooling...