All plastic 150W eBay desk mini-heater. (With schematic.)
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- Опубликовано: 10 сен 2024
- I got this just to see what the safety features were like. There seems to have been a spate of mini heaters being sold that either plug directly into a socket or are designed to be placed on a desk for low level local heating.
Most of the lower power ones seem to use PTC based heaters that self regulate around a small temperature range by increasing their resistance as they get hotter. I wondered what other thermal protection was present inside.
The unit seems to house a very standard looking heater module. It's quite neat that they've fitted it all into an optimal space. The replacement label on the box was wrong. The original data it was covering was correct for power and dimensions.
The fan isn't quite as quiet as the camera makes it seem. There seems to be noise gate that masks lower level noise.
If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:-
www.bigclive.co...
This also keeps the channel independent of RUclips's advertising algorithms allowing it to be a bit more dangerous and naughty.
I've seen some 400W heaters shaped like a teddy bear for around 5 pounds, those might be worth taking a look at too, seems like a cute instrument of death
I think I may already have that here. In pink plastic.
@@BigClive A pink plastic teddy bear of death?! YES! :D
@@SigEpBlue Double duty! xD
Of course in the old days we had the dual purpose light bulb/heating elements.
Electro-cute you
I was expecting a desk-on-fire-setter but it's actually got safety features.
What's safety??
Anyone else end up rooting for the little thing?
"It'll overheat and not cut out if I put it down flat."
*cuts out*
"It won't start up again."
*starts up again*
"It can't shrink heat-shrink."
*shrinks heat-shrink*
It's the little fan heater that could 🙂
Yep, I tend to root for the cheap electronics. There is something satisfying about things that confound expectations because, despite being cheap, someone somewhere down the line has put some thought and care into the design. For me it beats the "this USB charger might kill you" type results.
Just so long as he doesn't say "It's perfectly safe" we're ok.
I think 🤔 it can, I think 🤔 it can, I think 🤔 it can, It Can!!!!!!!
it trust it tbh
I have one
@3:21 - 'Oh, a slight vibration off this' - that's how it gives infinite pleasure, Clive.
Clive, as long as you keep taking interesting things to bits, I shall be pleasured... Perhaps not infinitely, but pleasured none the less.
So infinitely pleasured all the while Clive continues !
@@millomweb There in lies the the problem, none of us is infinite. Were more of a limited time offering.
@@crashk6 the 1 problem is: 0 of us could survive an ♾ pleasuring.
@@HighestRank but what a way to go...
"Let's test that... by giving it... the finger test." Excellent content :D
The outcome would've been different on an Electroboom video. :-)
@@vinzzbe *bang* "awwww sh*bleep* f*bleeep*"
Ah the finger test, useful in so many of life's little situations.
Well. It is for infinite pleasure
@@mr_b_hhc This hit close to home :|
When I clicked on the thumbnail I expected this to be a "150 watt" USB-powered heater.
I hallucinated the exact same thing. Makes me wonder, though, PD can allow up to 100W...
if it was a 150w usb heater it would require about 30A at 5v
I'm aware of that. Look back at some of Clive's reviews of things like 10,000 KWH USB battery packs weighing about 50 grams.
7:50 that motor is an RF300, a very good (high efficency) motor. Runs in either direction, can output some torque.
Forgot the exact specs, but was somewhere 0.5 to 6V.
I've got two of these living in an outdoor mini-greenhouse with a DIY thermostat controller to keep it above 15 degrees in winter....so far they have lived semi-outdoors for 2 straight years and are still working. Very impressed!
Hi mate I was just wondering how long you run the heaters for. Do you think they could run all day and night or is that to long?
@@holdengurl1013 You could run them 24/7. I only had one fan motor die but the built-in bi-metallic thermoswitch stops them catching fire.
Thanks. Dose the one the fan died still heat? Or does it cut out.
@@holdengurl1013 The heating element turns on but because theres no air flow it trips the thermal switch eventually which turns the heater off.
1:37 The way I remember it is that an axial fan is the one that moves air along its axis (ie a normal fan), whereas a radial fan moves air along its radius (ie a side blower fan).
That's it.
Yes, but I think that our favourite Clive may have been confusing the 'lean' of the fan blades (or he may not).
I have encountered someone who thought that because forward facing blades would 'scoop' the air in that bulk air flow would be from outside to the centre of the fan if reversed (for this type of radial fan).
air will flow centre to edge if rotated in ether direction.
www.rs-online.com/designspark/fan-types-why-choose-a-forward-curved-centrifugal-fan
That made that connection super obvious xD
The old electrician's rule: red is black and plus is minus.
Jens Goerke: my favourite " Red to Black, Blue to F**k"
Perfect.
Well re newish wiring colours, I do remember by thinking "Brown is nearly black so brown's live".
@@millomweb I'm guessing you're Ameeican? In the UK, the old colours were black (neutral), red (live), green earth/ground :)
pmailkeey we were told in school to remember that the live wire is the brown one because if you touch it that’s what colour your pants will be
Love the video, I use these little heaters for small off grid applications and I ended up adding a diode in series with the element which cut the start up current down by 50% and constant output reduced by 5%.
That's a pretty genius modification to a PTC heater 👍
Can you do those modifications for me, if I post it to you from Australia? 😀
Clive, the vibration is the infinite pleasure!
Always a great way to discharge capacitors: the finger test, the tool everyone has at hand. 👌
Until they try high voltage finger test then they burn through their testers hehehe
a common thing in the old days of hair dryers is they tapped off the heating element to power the fan, so no caps or bridge, just a diode.
What kind of motor would they have? I have a heat gun that has a motor that must have come out of a toy and looks DC powered and I have no idea how that could be done.
@@SquishyZoran The same way: they tap the heating coil to generate about 12V. A full wave bridge, usually four 1N4007 diodes mounted on a circuit board on the rear of the motor can, changes that to DC for the 12VDC fan motor.
A two speed heat gun switches in an additional section of nichrome heating coil on low power, which also slows the fan.
They couldn't use that trick in this circuit because it is PTC regulated, so it wouldn't have a very stable voltage.
@@SquishyZoran This will explain it:
ruclips.net/video/O45ghB23hA0/видео.html
If you wire the fan to run in reverse, it will still blow out the front, but very much reduced, it's a centrifugal fan.
Huh, I honesty though he would jam the thermal switch and power the PTC module alone to see where smoke would come out first
he's getting sloppy. Age's catching up to him already. Or he's hybernating cause its' winter, hmm
Haha haha!
@@dimitar4y Nah he enjoys a 8°C house, so there's no hibernation at that temperature :P
I'd leave that for ElectroBOOM to try.
I suspect there wouldn't be much since it's self-regulating.
I have no clue what you're talking about 90% of the time but yet i never miss a video!
Clive is the only one I know who would _hotwire_ a heater.
I think that the airflow of such blower can't be reversed (it never pulls air in). With the motor running in reverse, it would still blow, but with a different efficiency.
Exactly correct sir! (or madam, or madman, as the case may be). When run in "reverse" by Clive's definition, less air is flung out at a given RPM, but the fan also stops having the annoying habit of pulling more power when the inlet is blocked/less when the outlet is blocked. At a higher RPM, they will still move plenty of air, and create significant pressure if necessary, to achieve that flow. I've seen them used to drive a minor hurricane of air through rather restrictive HEPA filters, for a once-through air supply to hospital operating rooms. (No recycling of germy air!)
I watch your videos
To be honest, I was surprised by the thermal safety cutout... And then surprised again when I saw it self-resets! I imagined it would be the "unplug-allow unit to cool-plug back in" reset procedure many US heaters have. To have a fuse before the power switch is a nice safety feature that not even Weller soldering stations have.
Thanks for another great tear-down video, Clive. I've got one of these heaters and you've given me a peek inside. It's good that they took the trouble to add a zener to prevent the reservoir cap from exploding if the motor goes open circuit as of course it will do in time being a tiny brush-motor. A pity though that they didn't add a current in-rush limiting resistor to protect the contacts in the switch. I've noticed a sharp crack from the switch on occasions at switch on indicating a surge if it hits the peak of the mains waveform by chance. I don't suppose the switch will survive too long before failure because of that. Perhaps thanks to your disassembly demo I'll add a limiting resistor at some stage!
i have one of these. I use to use it in the office because 45 year old women wanted aircon on in winter because they were hot, so the rest of us had to suffer with freezing aircon. this helped keep my fingers warm on my desk for several years.
you talking about the fan and it possibly fouling the housing and making a noise reminded me of something that happened some years ago . My ex used to work for a council in the U.K clearing rubbish and taking things from houses for people when they wanted something disposed of . She went to a house and collected a microwave cooker , quite an upmarket one . Instead of taking it to the tip she brought it home for me to take a look at it . Plugged it in and there was a horrendous screeching noise . Out came the screwdrivers , off came the cover and yes , the fan had moved on its shaft . Eased it out , mixed some Araldite , put back together and bingo , we had a microwave . The thing was like new inside and out , hardly used if at all . She collected it from an affluent area so chances are it was bought , plugged in and made the noise so they just bought a new one and threw this one out . Lucky us
I'm still waiting for my chinese automatic house ignitor to arrive that I ordered before christmas, need to get warmed up by dangerous heater products, this one is just too safe with its' thermal cutout safety feature!!! :P
did you order your Chinese automatic house igniter ,with or without the automatic magic smoke release option? and it must have randomly flashing colored LED lights or it's no good. it's the only way to tell real china quality.
@@immrnoidall Real china quality means it arrives broken, with a small boot print on the outside of the package.
I remember when I took apart a broken camera after I'd been testing it, I thought it wouldn't be that dangerous running on 2 AAs, I bridged the capacitor for the flash and ended up with 2 deep scorches on my finger, its probably the worst shock I've ever had and I've been shocked by a 100kv HT lead on a car. I think the biggest thing was that the capacitor felt like it passed allot of current over a longer period of time which ended up burning my finger pretty badly.
I like the way the thermal fuse doesn't cut out the fan.
That part may have actually been designed by an engineer. But then the bean counters and production line gets a hold of it... So they have to make the case bigger because it was melting, lol.
Actually that build quality is pretty top of the line for gadgets, wire routing as you pointed out, tab on the lid to hold the mains socket steady, thermal disconnect, everything screwed in, and minimal parts to reduce failure. The only issue with cheap Chinese stuff is you never really know unless you take it apart as you did but they did a nice job on that I think.
I’ve got one after seeing this being taken apart. It’s got a uk plug and rated 200watts. Output temp is 129°c. Simple & effective for a small room.
5:33 “we’re screwed”. Well you said you wanted to enjoy the infinite pleasure....
I have one vary similar to this thing but 12V for automotive battery. Works quite well to get the chill out of the cab until the regular heater ever tries to warm up. Defrost the wind shield quite fast too.
I have one of those for my old pickup, because the heater core went to hell and it's not worth fixing!
Hey, better than a sharp stick in the eye ! 😊
@@kengamble8595 Sounds like my ride. LOL I picked mine up at the Flea Market some years back for like $1.00. It was all grubbed out but cleaned up and still Chooching along all this time.
@@kengamble8595 Actually I wouldn't mind finding a few more. They would work good as a Dump Load on my Solar system. Better to warm up the hall way a bit then just use a resistor to burn it off. Else should be going to a water heater if I ever get around to getting one.
@@pulesjet
I got mine at Harbor Freight a few years ago, when they were on sale of course! Don't know if they still carry them.
@@kengamble8595 Closes one to me is some 50 miles one way. I make it there maybe once a year. I'll try to remember. LOL
The best "small~ish" heater I have is my Core 2 Duo laptop with a Dedicated Nvidia GPU, that's how you get nice and toasty on the go
AustinG not gonna lie I used to use a first gen i5 to warm my desk at work years ago
My mobile i5 580M with the a Nvidia gpu is also a great heater. I can't even use the thing at 100% cpu speed cos it pushes beyond 100C
@@OrbitalSP2 I know what you mean! I had a laptop with an i3-350M. Man those things get hot and love to throttle by themselves.
Lol I actually have one of these and know exactly what you mean! I have an Asus G50VT laptop (Core2Duo P8700 and an Nvidia 9800M GS).
@@bluegizmo1983 nice! Mine is a P8600 and a quadro nvs 160m
I have used one of these to stop my hands freezing at my desk over 2 winters and it has been great - but I never leave it unattended
Why don't you simply use a 100 Watts incandescent light bulb?
@@christiangeiselmann
Probably because they're too hard to find now with all the greeny laws.
@@christiangeiselmann Or because they radiate heat in all directions, rather than blow it towards your hands. And if it's on your desk you might not want to have a 100W bulb shining in your eyes all day. And a PTC heater is a neater more rugged package that won't get as hot to touch as an incandescent bulb would.
...Or, you know, it's the green police's fault.
@@christiangeiselmann What kind of 100W lamps blows warm air in the direction of your hands?
SkyWizardless You can hold your hands close to them. Advantage: no noise. - I prefer that, instead of having a thing humming all the time. But of course, your decision.
You take the infinite pleasure heater apart, I’ll have a beer and smoke.
Keep up the good work fella
Doesn't the beer and smoke come AFTER the pleasure ! 😊
Ken Gamble
beer and smoke is the pleasure
wow its funny how i found one of these recently brand new at a thrift store for $5, its awesome to see hes taking one apart now lol saves me time
Got one of these based on this video to help dry out my car after a big rain leak and it’s done a great job on one side but the bimetallic strip broke after 3 days of it being turned on before I could dry the other side. Neat little unit though, not too hot to damage anything just not up to constant use.
I believe these type of heaters are actually for finger nail polish
Finger nail polish curing is sped up by UV not heat.
@@eraldorh Regular nail polish doesn't react at all to UV but heat (and moving air) does reduce the curing time. Specialized UV nail polish/gel exist, these require UV light to cure but shouldn't be confused with regular nail polish.
You all all wrong, nail polish is actually cured by gamma radiation so its best to keep a small supernova in your closet
@@whatsonchannelB I use a black hole, but I have to keep some curry handy.
Far too much knowledge of a non-engineering topic; are you here for the 'pink' side of Clives' videos I wonder ;)
I use a pair to keep the inside of my resin 3d printer warm. A simple temperature controller for a terrarium and some insulation work wonders.
Yes, I agree it likely has far more better uses than just heating desks.
Still infinitely better designed than Broans flagship $450 bathroom heater fan combo. I see Chinese can afford self resetting thermal cutout in their $8 items. Yet a masterpiece of $450 American ingenuity uses only a thermal fuse that forces you to replace the heater pack every year. I finally re-engineered their crappy design so now it works. Manual reset thermal breaker with small piezo buzzer in parallel WITH thermal fuse of slightly higher temp rating.
Now when the thermal breaker sets, I hear it and I know it is time to disassemble and clean lint out of the heater. Simple push to reset after vacuuming out the heater assembly and good to go for another year or so until needs cleaning again. The thermal fuse is still there to protect catastrophic failure in the event the thermal breaker fails.
I did it for you Broan! Engineered your product correctly for you at no additional charge.
Ah, you uncovered their repeat-business generator! How dare you break their business model! :-)
Outstanding! A Big Clive tear down and I just sat down for tea.
The power lead appears to actually be to US plug standards. The holes in the blades are the US/North American standard whereas the straight/plain blades with no holes is the Chinese version.
That's what I call a hybrid plug. The blades have the holes, but the part you hold on to appears to be too small to meet standards. Also, heater plugs are supposed to be polarized (so that the switches are on the live side and not the neutral) and those are not. That thing definitely wouldn't meet UL or CSA standards, though it's not horribly dangerous, either
Those little motors are very common indeed. I replaced the disc drive motor in an XBox 360 with one of these I sourced from the vibration motor in a PS2 controller.
You can't replace the optical drives in a 360 because Microsoft decided to match the serial #'s to the console. But nothing to stop you from replacing the motor hehe
I got the 360 for free because the owner though it was junk - that was 7 years ago and it's still working.
Nice 👍
All hail the HOPI.
Good idea for a t shirt that.
Or, " Hopilite Army."
Ed O'Brien, will it shimmer?
flickery t-shirt
@@dsloop3907 it could. A little electronics and it could...
@@Phred_Phlintstoner
Electronics? Why not just see some sequins on like a real man?
I accidentally did the finger test on a faulty 4K monitor last week that had been switched off and unplugged for a month. I had 2 tiny marks on the surface of my skin and a dark line between them about 5-7mm deep under the skin. I learned some new words that day.
Now that Clive has had the infinite pleasure, will he continue to take things to bits?
I've got one of these. I get cold hands frequently and this device really helps.
"And I want infinite pleasure" ... got me a new message alert tone, lol. As ever, great vid Clive.
From the image it looked like some kinda 18650 battery bank with some heater feature :-D
At the 5C inside Clive's apartment he could use that heater to keep his porridge warm while he eats it.
You're a legend Clive! Always some random item of interest, have a terrific new year.
Lol,"its not doing anything to the heat shrink!" Then it shrinks slowly! Had a good laugh at that timing!
Self regulates and makes low level heat... That might be something that could be hackable into heating for pets. Like a reptile enclosure, bird cage, or a small dog house. (At least if it doesn't outgas much after breaking in for a while.) Heater itself would need some weather and/or mess proofing (likely by mounting it high and ducting the output elsewhere), but it wouldn't be too hard to make it circulate into a bigger enclosure that it helps keep warm. And perhaps controlling it with an external thermal switch, if the enclosure that it helps heat isn't too drafty.
I’m at the reverse engineering part right now and I’m Really Hoping That You Just Assumed The Fan Polarity Before The Video Is Over!!!! Fingers Crossed 🤞🏻 You Blew It Up 💥!!!!
Bummer!!! It’s Polarity Was Wrong On Purpose For Fan Direction!!! Noooooooo! Please Still Blow It Up!!!!!!
I'll order one of these too to add to my "But, Big Clive said so!" collection. :)
You too, glad I'm not the only one!
I had one before the video and I still have it
Fan-heater Minor, never leave minor's unattended.
Speaking of minor's, no F-sharp's were struck when a finger touched the hot surface.
Good control there, good review as always.
You left out your apostrophe: alway's
In hillbilly country, we call those "squirrel cage" blower fans
B-but “squirrel cage” refers to induction motors though
@@Scrogan nope. Just any cylindrical cage type fan. The HVAC blower in a car for instance.
@@Scrogan That's a squirrel cage motor. Not a squirrel cage fan.
The term is used for both items, even though they aren't otherwise related.
@@longrunner258 Except that one often drives the other. :-)
I have one of those only in black and it was marketed as a fingernail polish drier . I used it in my car to defrost the windshield while my heater fan was on the fritz.
Greetings from the middle of Minnesota.
I absolutely need a t-shirt with 10:35's "mumble mumble, ramble ramble. poke. fumble, fumble" on it.
500W With Flaming Sales Information 🔥!!!! I can’t wait 😊 to see what the 2-3 stacked PTC Elements is gonna be like!!!! I’m looking forward to seeing that video!!!!!
Thanks for sharing, expertise and British humour, we want more !
i brought one of these on amazon, it arrived today and works fine actually
I use one of these for camping where electricity is available. If you have a small separate sleeping area (like a Japanese sleeping compartment) it will prove useful!
*@ bigclivedotcom* Thank you for doing what you do.
You bring great pleasure to many thousands of people.
We love you.
But is it infinite pleasure?
He gives me enough pleasure.
May your beard never grow thin!
5:54 "I should get rid of our powerphernalia here" ah if only that is what he really said.
That's why I love your content.. Haha! oh let's see what kind of High voltage is stored in this capacitor key word "high voltage"! With the old finger test.... Lol made my night!
Warning! Do not open, may cause electric shock. He says "Lets test this with my fingers" LOL. I am still laughing. Reminds me of electronics class. We used to charge up 600v caps and put them in the teachers desk. He never learned. Always picked them up and zap.
I got it, it works. I bought it for my stray, cat she loves it.
That plus is a US standard 2-prong plug. A standard Chinese plug looks the same but doesn't have the holes on the prongs.
Just for clarification,
Team Velocity | Software at its finest
Also, I love the videos, the quality is perfect, and the amount of general sarcasm is just... Crazy. Thanks for amazing content.
Best,
Team Velocity | There for you, when you aren't.
I just bought one of these and since I had to take it apart to bring the heating element wires out separately (I'm hacking a little temperature control system for the tent of my 3D printer) I was looking at the power supply and thought, "Big Clive should have a look at one of these... if he hasn't already". Went looking and here it was. :)
I believe these are typically used more for drying your nails. Cold Hands Club where you at
That finger test made me wince
Cute little device, but I certainly would not take my eyes off it when it’s powered up. Thank you for showing it.
I have one of the ones that plugs into a outlet with no cord it sits on the outlet it self rated at 400 watts @120 volts us warms a small room that is 8X8 foot with my radio station in it works nice to keep your feet warm under the console desk .
I find the finger test usually brings infinite pleasure.
That's FAN-tastic, at least it has the thermal cut out. I didnt realise the ptc would get that hot.
Question of the week - "Watts it actually running at?"
On thermal cut-outs - beware of the possum switch! - I have a heater which has a thermal cut-out that stays "out" once it has been tripped (can make you believe it's a single shot fuse), however, disconnect the power and let it stand for 10~15 minutes, and it will reset itself - It plays possum! - These possum switches have a normal thermal cut-out appearance and operation, but also incorporate a small heating element connected across the contacts such that when the contacts are opened it now sees the current available at the contacts. The heating element now heats up and maintains the heat local to the bi-metal spring, thus keeping it in the "cut out" condition, and will maintain that status indefinitely (until the power is removed). Disconnect the power and let the cut-out cool down, then all is well again.
Now then, that fan - It looks like a 'Sirocco' type radial fan, and counter intuitively, they rotate with the concave side of the blades "leading" the way. If you run one backwards (convex side leading) it will still blow air, but is nowhere near as efficient. - Air enters the fan at its hub and is accelerated radially under centrifugal force. This leaves a partial vacuum at the centre of the hub, which draws in more air. As this air is accelerated radially, it forces the air in front of it further out along the blade. Because the blade is curved (concave) the air is forced forward along the curve and is further accelerated as it exits the fan at a massively greater rate (in a sling-shot fashion) than would be possible with a straight bladed fan.
All-in-all, this one looks like a halfway decent effort, but even then, I would never leave one unattended. One possible use that comes to my mind would be for heating (baking) old recording tapes to restore their playability.
@bigclivedotcom - At 14:55, when run in "reverse" by your apparent definition, less air is flung out at a given RPM, but the fan also stops having the annoying habit of pulling more power when the inlet is blocked/less when the outlet is blocked. In the case of this little heater, a polarity-reversing switch on the fan power will give the unit 2 different heat outputs, because at low airflow, the PTC resistance element will run at lower power. By the way... At a higher RPM, those centrifugal/radial fans still move plenty of air when run "backwards", and create significant pressure if necessary to achieve that flow. I've seen them used to drive a minor hurricane of air through rather restrictive HEPA filters, for a once-through air supply to hospital operating rooms. (No recycling of germy air!) The same principles apply to centrifugal pumps for various liquids, and vanes all pointed straight out radially from the shaft also work, with characteristics somewhere in between those of forward-swept and reverse-swept blades.
Nice little heater. Thanks for the year down. Could actually be useful for something, can't beat the price if it is!
If you had blown that capacitor, you might have been able to do the OG finger test, off Taofledermaus.
I reckon the case needs a little bit more design work to remove the ability to bottom out on the fan and output surfaces.
Thank you for taking this apart so I don't have to destroy the one my wife got and then hide it...
Something like this would've been useful for me at our old office.
My desk was under the first vent after the air handler, resulting in a freezing cold stream of air blowing on my neck all day. On one of my early morning starts, I grabbed a ladder and shut the vent, the next day someone from building services came and opened it again. I asked why and he said the ladies were complaining about too much cold air. I was basically forced to sit at my desk with the hood of my hoodie up all the time, even in the middle of a hot Australian summer.
It might not have kept the back of my neck warm, but at least something like this would've helped to keep my hands from freezing!
Anyway, a while later I was speaking to the building services manager, and he was boasting that they'd got the efficiency of the A/C so high that the air coming out of the chiller unit was basically 0°C. So I asked him why our server room was over 25°C in summer, and his response was basically mumbling something about it being on a different system, and how IT continually adds more servers and never retires any old ones.
Thank you Sir, I would definitely buy that for my industrial use
Those mini heater are very good for people who 3D print with high warp material (like ABS), you can preheat you enclosure and prevent some printing srew-ups. I bought one at a small store, is made of a better plastic (PA66 + GF) and works pretty well in a small enclosure. (No i dont have it always on, I heat it to arround 60ºC and then the heated bed keeps the temperature constant)
Thankyou for saving us all from falling for this trash.
Due to some aerodynamics, both fan directions will throw air outwards, but one direction will result in lower airflow and higher air pressure (useful for forcing air through a heater) and the other high airflow low pressure (useful for fanning yourself)..
Probably won't make a huge difference in this case, but in pressure critical things like bouncy castle blowers it can make quite a large difference.
You haven't had much experience with fans have you? If youir theory were true propeller aircraft couldn't use reverse thrust, and my squirrel cage fan wouldn't be discharging air out the side.
@@adrat8339 look on Wikipedia about squirrel cage fans
The direction of the blades does indeed affect the volume to pressure ratio in a squirrel cage fan providing the direction of rotation stays the same. However, the housing design also plays a major part in air flow. While I concede the airflow will not reverse, with the motor turning in reverse. Because of the housing design when the motor is turning away from the discharge port instead of toward it, the result is a near total lack of air flow. I also do not understand how the blower in my old computer room at work discharged the air from the side of the blower and not the front. I would love to go back and see how it is built. Good on ya Michael HHT, thanks for keeping it real, it is never too late for me to learn. (I am 76)
Finally something you could power from usb (latest ver goes up to 240w) just not sure about the voltage.
If I remember correctly, Centrifugal pumps are a bit confusing, they actually operate in the opposite manner of what might be intuitive. The direction in which they "throw the air inwards" is actually the proper orientation.
You're mistaken if you think that the fan would suck air if it ran in the other direction. Rewire it and see for yourself. That the vanes are pointing in the "wrong" direction and seem to scoop air up is only the case if you don't consider the centrifugal effect. In fact if it turned that way it would be MUCH more efficient. Test it.
Interestingly, I do think that they DID wire it wrong on purpose. As a hack. They must have noticed that the fan is too powerful for the PTC element, so that when it rotates properly, only lukewarm air comes out. So somebody thought that instead of modifying the circuit, they'd just wire the motor wrong so the fan rotates the wrong way. Regulating the airflow by inefficiency. As the PTC is self-regulating, you might in fact be able to eke out far more power out of it by wiring the motor correctly.
Of course, one should never attribute to malice what could be attributed to stupidity. So I don't exclude the possibility that they tasked someone unskilled with soldering the wires without bothering to explain which one goes where. So you possibly have about 50:50 chance of getting a motor wired correctly.
Btw that is a radial fan, Axial fans have airflow in the same direction as the axis of rotation, radial fans have airflow radially outward from the axis of rotation.
That would be a centrifugal blower. If run backwards it wouldn't reverse the air flow, but it would run at greatly reduced efficiency.
Thank you for all the quality content if you happen to read this Big Clive.
That looks like a crazy dangerous fire 🔥 hazard just waiting for someone to leave it unattended and burn down their house!!! 🔥🏠🔥
Especially when something falls onto the heater and it starts a fire before the bi-metallic strip activates because it’s already at full temperature and then gets partially covered up with a little gap where some hot air gets past the blockage and the heater is still going and getting hotter!!!🔥🏠🔥
That heater casing looks like it's made of glass reinforced thermoplastic. A soldering iron should find the melting temperature pretty quick. I bet it's around 280°C if it's even a thermoplastic at all
4:51 Why did it took you a full 10 seconds to notice the device has fully powered off? Lmao
I say some of the text on the box is poorly written English at 2:27 a clear transparent UK plug that's rare that Mini Heater wouldn't be allowed to sell in USA unless if it passes certified tests
The modern version of Bob Cratchit's hand warming candle...
An incandescent light bulb would be more analogous, though.
Lel good comment
Squirrel cage is what I've always heard those fans called. Why? Couldn't tell ya. Logically, in liquid pump terms that would be a centrifugal pump. So maybe a centrifugal blower?
Actually, a squirrel cage blower has this: i.ebayimg.com/images/i/121717893526-0-1/s-l1000.jpg instead of the impeller you see in this small heater.
Now I'm going to watch Make trash-wine or moonshine. A bigclive classic
That power lead has the standard North American prongs on it -- note the holes. The Chinese ones are solid blades (afaik). Here we have the holes, and you'll notice the plugs (should) be polarized: one blade should be taller than the other.
Have to send one of these to AvE so he can use it while he’s videoing! Maybe his hands won’t be so pinky! 😂