I made a Scam report on that fake ass Solus radiator on Kickstarter, including also link to Dave’s video, and few other engineers busting those fake ad pitches. Unfortunatly, as expected, they sent an answer to me today saying, “thanks, we appreciate your feedback. We looked at the engineer’s video that you sent, but we still don’t see Solus promising something that they can’t deliver”. Like what the F*CK Kickstarter?! I provided you with all the evidence necessary to close down on such scams, but they did nothing to step it. I guess money doesn’t stink, regardless of where it’s coming from - Kickstarter craving that sweet % of all donations...

@EEVblog

5 жыл бұрын

Nice try! Can't say I'm too surprised.

@nodriveknowitall702

5 жыл бұрын

They're claiming an efficiency improvement that's impossible to attain. I reported them as well. It's funny to see that much money go right down a toilet.

@EEVblog

5 жыл бұрын

Someone else also reported them and got a similar response.

@johnjohnchu

5 жыл бұрын

I guess the law of conservation of energy does not apply to Solus.

@dragonboyjazz

5 жыл бұрын

mate, i hate to break it to you but they didn't break any laws or even mislead anyone, the problem is that heaters are 100% efficient, so telling people your heater is 100% efficient would not sell the product, they have to think of new ways to market an old product, and they did. still scum and scamy but what can you do? the cheese in woolies is to expensive... Ultimately only stupid people back kick starters without any knowledge of what they are supporting or spending their money on.

Technology Connections just did a video about space heaters also.

@TheWebstaff

5 жыл бұрын

Was just looking for this comment it's like deja vu kzread.info/dash/bejne/iGGez7WjqZWnorA.html

@EEVblog

5 жыл бұрын

So everyone keeps telling me, over and over again...

@natalieisagirlnow

5 жыл бұрын

i think someone wrote a textbook about it once

@mrfrenzy.

5 жыл бұрын

Both videos are worth watching as they cover different aspects of the subject.

@AnthonyGoodley

5 жыл бұрын

Having watched both videos I can say both are very good and informative.

I would LOVE to see power resistors marketed (?) using the phrase "100% Efficient" ;)

@lukahierl9857

5 жыл бұрын

Make a kickstarter

@christopherhauck4702

5 жыл бұрын

@@lukahierl9857 fuck you are gonna get so rich then instantly sued

This is the best video on space heaters I've seen from a theory perspective. It covers in appropriate detail what is typically only covered in many other videos. Thank you.

I know very little about electronics. Still, when a new video drops, I watch it. Why? Super fascinating and educational.

@EEVblog

5 жыл бұрын

Thanks, glad you find them educational.

@woksrandomchannel

5 жыл бұрын

I still find it amazing how something that fit inside of a warehouse is reduced to a tiny chip on a board. I imagine what quantum technology will accomplish in 50 years?

@odindimartino597

5 жыл бұрын

@@woksrandomchannel "Quantum" is a magic world because, technically, wood stove radiate and the way it does this is quantum physic.

glad you clearified the terminology after your last video

As my thermodynamics professor said, at the end of the day a refrigerator is just a slow space heater.

@ats89117

5 жыл бұрын

Good point. Refrigerators and big screen TVs are as efficient at heating as space heaters, but they can do useful stuff while they are generating their heat. You could even go further and generate some kind of fuel, e.g. hydrogen and oxygen, while you are generating heat...

@TheJttv

5 жыл бұрын

My roommate and I had two mini-fridges in our dorm room. We barely turned the heat on.

@AnalyticalReckoner

5 жыл бұрын

It's also a dehumidifier.

@JuanHerrero

5 жыл бұрын

I heard the transition from filament lightbulbs to more efficient technologies led to the death of some old people on cold nights (because the switch made the rooms they slept in noticeably colder). One has to wonder, given the environmental cost of LED and CFC bulbs vs filament, once you factor in the "wasted energy" is heating, if they shouldn't be still in use in colder climates.

@fleksimir

5 жыл бұрын

@@JuanHerrero Ideally they still shouldn't be used in cooler climates, but only because there are (often, at least) better ways of heating up a place. But you are on point, it's not wasted energy if that place needs heating. It's wasted where you don't need heating, and it wastes even more than it consumes if you're also cooling the room with the light bulb in it.

I'm surprised that heaters are even known in Australia 😁

@kstxevolution9642

5 жыл бұрын

if there's a single thing that aussies understand it's heat

About a month ago, an ad claimed 85% saving on your electrical bill using their electrical "radiator", I answered "Bullshit". I was banned, but I still recieve thumbs up notifications, they forgot to delete my message. :P

@EEVblog

5 жыл бұрын

People don't like Facts, that will get you banned every time!

@nodriveknowitall702

5 жыл бұрын

The Solus kickstarter is still active. Don't delay, sign up for a kickstarter and report it today.

@richardgates7479

5 жыл бұрын

People don't like Facts, it's so true, I like to point out scams to people and I tell them why, and they know nothing about it and just say it makes them feel better or something - not specifically heaters but any scam / misleading advertising. People prefer to believe in magic, or whatever sounds good, and don't care how the magic works. Pointing out mistakes doesn't hurt anyone, but most will get offended.

@nodriveknowitall702

5 жыл бұрын

Surprisingly, I couldn't find my question in their FAQ so I asked the "creator" a question. Question: "I think the guilt of scamming people out of money would prevent me from sleeping well. How do scammers sleep at night?" His response: "I don’t know how scammers sleep at night. I imagine quite fitfully. However, we sleep very comfortably at 21 degrees celcius, knowing our heating bills are many times cheaper. Good night!"

@AttilaAsztalos

5 жыл бұрын

I would like to point out the Kickstarter's "rules" include absolutely nothing against outright fraud. Yes, really, there's nothing prohibiting stuff that objectively can't work (as claimed). What a bunch of fine upstanding assholes, innit. There's some mumbling about not "misrepresenting" things and being "honest", except the "report project" button that requires you to categorize the offense conveniently doesn't include EVEN THAT as an option. It's beyond me how in seven hells are they still in business instead of getting crushed by someone doing the same only with better standards...

Man, that radiator scam must have gotten you... really heated. (I'm sorry)

@pomonabill220

5 жыл бұрын

DOH!

@OliverUnderTheMoon

5 жыл бұрын

But no more efficiently than any other pun.

@EgoShredder

5 жыл бұрын

He was just hot under the collar and not radiating his usual charm.

@restcure

5 жыл бұрын

I honestly doubt that you are even the least bit sorry.

@christopherhauck4702

5 жыл бұрын

so much cancer from such an ir-radiated dude

Heating tip!, Invite a group of friends, or down and outs to heat your house, when it gets warm, your odour sensor will kick in. On a serious note, excellent tutorial/refresher. Thanks for sharing.

that Technology Connections has been down this rabbit hole on his channel before! keep up the good work man.

Interesting video on such a basic subject. Thanks Dave.

@EEVblog

5 жыл бұрын

Yeah, basic but interesting.

Awesome no BS video, Dave !

Thank you teacher, I finally got to understand this heater thing.

Very comprehensive, nice :)

I love these Fundamentals Friday type videos

Thanks Dave, very informative. I am a thermal imaging fan and enthusiast; but not an inspector. This might be useful in the future.

Thanks for the lesson.

Dude awesome video

Love it!

Thank you for doing this video Dave. This video is a great followup to the Solus scam. This video explains many things that in the previous Solus video were not as clearly defined/explained.

Good video.

Thank you, it was very informative and very well presented. I really like it when you don't limit your content in electronics and for this instant exploring thermodynamics and physics... Before this I thought, I had a very good understanding of the laws of thermodynamics, then I realize so many things I didn't know!!!! really appreciate the time and effort...

This video reminds me of why I subscribe to you. Great content!!

@EEVblog

5 жыл бұрын

Thanks

Very nice explaination. Never thought about it. Only now that I really like having some of these IR panels. Dome shaped and mounted on the celling.

Hi Dave, concerning another wue wue heater.. Did Aaron ever send you the Accudrive 1.4 firmware yet?

Infared heaters are used in the UK for smoking shelters in the winter, they're typically up high pointing down and will near set your hair on fire but everything else remains freezing. Now i know why :)

I like to heat up my room with old computers...

@crimsonhalo13

5 жыл бұрын

Fallout 4 on max settings on a half decent gaming rig should do the trick.

@christopherhauck4702

5 жыл бұрын

@@crimsonhalo13 not really my low-mid rig "only" consumes ~200w unless I am using synthetic/mining loads your average game on a quad cpu with a modern gfx card will never come close to even your fridge in heat output I recommend building a rasberry-pi cluster with failover functions so you can turn on as many ~10w loads as you need and just mine bitcoins on the cluster note: @EEVBlog where is the next apple pi cluster vid?

@DantalionNl

5 жыл бұрын

I heat my whole house with computers, this program works great boinc.berkeley.edu/ More than 100% efficient ;)

venting the attic area below the roof is also to vent moisture as well as keeping the roof surface cold so that there is no condensation on the bottom structure of the roof which can turn all moldy and rot wood and stuff like that ( for those of us who live in the cold countries ) .

This is exactly the material I missed in your previous video, and that's exactly what cought my ears when you kept repeating: radiant heater... radiant heater...radiant.... Good timing for this video. There's a whole field of forced/natural convection hydronic heating that has not been even mentioned, and let's keep it that way(it's an endless rabbit hole).

EEVblog the new HVAC channel. Good video! The distinction between efficiency and effectiveness is really important. There really a lot more to it when it comes to heating / cooling any space. Couple notes: BTU is a unit of energy and Watt is unit of power. There is a fundamental difference. I think you should have made that distinction. You're fine with BTU but not fine with W/h? Consumption in manufacturers brochure indicates used electrical energy. That type of indication is pretty common since people are charged by the kWh/h of the electricity. That's why electricity "consumption" is the the used energy, not power. Energy consumption tells more about the heating solution than the power, since it also gives an idea, how effective heater it is. Also it makes easy to compare different heating solutions. Natural convection heaters are usually placed under windows, where the losses are greater, to enhance to the convection effects. Comfortable living space. Good you brought that up. That is the thing that matters when designing a heating solution. The room might be really tall but usually you only need to heat the air in the space where people can sense it, lets say 0-2m from the floor. Skin is very good at detecting flowing air that is in different temperature. That is why one must always try to minimize air movement but also make sure that air mixes well enough to provide equal comfort in every part of the room. And all that with minimum energy usage. By saying that "get a forced convection fan heater" it won't be true for all situations. When you live in a place (like here in Finland) where you need to heat you house constantly around the clock for 10 months of the year you just need a solution to keep up the temperature. In those cases natural convection is better because you lose the fan noise, unnecessary air movement and the also the itty bit of fan power consumption. Fan heaters are good for spaces that you need to heat up occasionally and quickly. Also some heating methods have some practical limitations. Floor heating is one of them. You might think that pumping a lot of power into the floor heating is way to go. Well, many floor materials (structural and finishes) won't like temperatures over lets say 40 degrees C. Also going over that is starting feel too hot for you feet (imagine hot sand in the beach). So this temperature limit is the limiting factor in floor heating.

I bought a Solus and put it on the wall as suggested the kids outside have never been so warm ;)

Probably going to attend Thermodynamics in the coming semester. Thanks for the intro.

@zn4rf

5 жыл бұрын

I hope you like tables full of numbers and reading graphs :s but it can also be fun.

Finally, a video that speaks to me

@EEVblog

5 жыл бұрын

Hello

@andrewheater1061

5 жыл бұрын

hey mate

I've got to get some of this Woo Woo graphene I keep hearing about!!

@EEVblog

5 жыл бұрын

I've heard it's good shit

@dennis_m

2 жыл бұрын

@@EEVblog Hi Dave, I know this is an old video, but I stumbled over it again since it's winter over here and KZread started re-recommending. I have a question about these halogen heaters that we have. It products quite a lot of visible light (can be quite bright) even though it's supposed to be IR heater. So the question is, are these heaters still 100% efficient in heating, or it loses some energy as visible light?

Does a computer drawing 300W of power heats as well as a 300W heater? If I get things correctly, the only way a heater would be less than 100% efficient is if it radiates microwaves or other radiations that could pass through walls.

@autogolazzojr7950

5 жыл бұрын

Yes, it will heat just as well. For the second question, it would still be 100%, because heat can be lost as well as radiation, and the radiation will eventually become heat.

@Sylvan_dB

5 жыл бұрын

yes, but note that while your computer may be rated at 300W it likely rarely if ever will draw that much (unlike a space heater). 1/3 to 2/3 the rating is what I'd consider normal, as the power supply is typically sized for more disks or a bigger video card or even just more connected peripherals than "normal."

Thanks for the informative video. Does it make sense to use a ceiling fan in winter mode?

I loved the video! It would be cool if you went further into heat pumps and talk about natural gas (propane, oil, coal, wood, whatever) heating as well and how BTUs are used in that.

These 31 dislike is from SOLUS employees :)

Radiated heat has been quite useful in my experience, especially when my granny was visiting at my parents. The elderly often prefer a much higher room temperature placing her chair 1.5-2m away from the glass window of the wood burning stove burning during the winter. A good way to keep them comfortable without cooking the rest of the guests. As for ways to heat a room, I've always been partial towards floor heating giving a nice evenly heated room and no cold feet even on stone tiles. But it's far from the cheapest things to install I guess, especially if it's not a new situation and you have to take your existing floor material out. The cat we had during my childhood used to love the floor heating in the bathroom, she'd often claim some spot where someone left a used but by now fairly dry towel on those heated tiles.

How do thermal cameras focus ir light?

And they have also thermostat ( radiator, fan heaters) to turn off and save electrical power.

you can put the panel radiators on an interior wall instead of outside wall to prevent excessive exterior losses.

You'll get some blackbody radiation off the oil convection heaters, just not a lot. At 40°C, 313°K, the peak is going to be around 9μm, and you'll get about 550W/m² of radiated heat. The IR radiators are probably more like 2000°K at the heating element, and about 900kW/m². Of course, the area of the heating element is much smaller. As far as the efficiency goes, you'll get some miniscule losses from RF frequency emissions being lost, but that's pretty tiny.

@theuncalledfor

5 жыл бұрын

RF? Radio Frequency? Radio Frequency frequency? Looks like you have PIN number syndrome, also known as PNS syndrome to be extra self-referential. Unless I misunderstand what RF is supposed to mean.

I was wondering why Technology connections released a video about this at the end of February as opposed to say, October. Seeing the topic of the next EEVblog, I now realise it's the Kickscammer Watch at work.

Just curious, have you seen the old e-glass?

There is a term Dave should have mentioned that is thermal confort. It is more confortable to warm up in a room with good air temperature that staying outside under a an IR heater getting your head overheated. So for indoor use the conventional convectors win. If we are trying to heat up a really cold room with cold walls, a fanned heater is the way to go. You can heat up the air in a cold room in a couple of hours, but the cold walls will be a source of cold for as long as a day. The fanned heater will mix up the cold air that settles with the really hot air up top giving you a better thermal confort. As of for staying outside the only feasable way to get warm is IR, because the warm air around you just rises up and gets lost. Warming up your back or hands around a campfire gives you that little extra thermal confort you were lacking at an outdoor grill. ;)

In the case of the "glass on both sides" radiator, the glass on one side could be made reflective to IR, while the other one was transparent?

@EEVblog

5 жыл бұрын

Yep, but in the case of Solus they didn't

Brilliantly explained Dave. Those Glass and Graphene heater guy’s really pushed your button. Unfortunately there are still plenty of idiots around that will watch this video and continue on to invest in their wink wink, nod nod, revolutionary idea.

What I really want is heated floors. Seems like the best way to evenly heat a room.

Does a thermal sheet act the same way as the glass does?

You would've made a good high school science teacher Dave.

They mostly use argon in doule glazed windows, not just air.

@paul66766

5 жыл бұрын

Most manufacturers will have a few options, Nitrogen and Argon are the most popular, but some offer Krypton and Xenon (usually in triple pane windows).

@johnfrancisdoe1563

5 жыл бұрын

Paul F Nitrogen is generally good enough with appropriate dimensions and configuratipn of the glas

I think you should have spent more time explaining Air conditioners in this video. Efficiency ratios of 2 - 5X are easily achievable in ACs so it is important to be mentioned in a video in which you say that no heater can achieve more than 100% efficiency.

@EEVblog

5 жыл бұрын

I think that's best left to another video. I wanted to focus on electrical space heaters.

@slamdvw

5 жыл бұрын

There's also a difference between picking the heat up and moving it, vs creating it directly. Heat pumps pick it up and move it, a resistance heater creates ( converts electrical energy to heat, but you get the idea ) it directly.

@czarzenana5125

5 жыл бұрын

By your definition the sun has unlimited efficiency. You do not put in anything and still get all the energy it radiates.

@slamdvw

5 жыл бұрын

now if we could only gather up and use all that energy.. * sigh *

@stabileseitenlage

5 жыл бұрын

The efficiency of consumer electronics is measured by the electric energy input in comparison with the desired energy output (heat, light, etc) That is the reason a heatpump can be above 100% efficient. From this standpoint, if you use the sun as a lightsource or heatsource it could be considered infinitely efficient, as you don't input electricity. And to support that claim, just think about something like this: "save 100% of your heating bill by just heating with the sun". That works, in theory, even if it doesn't heat that much.

2:15 - the hot atoms and molecules move through the metals or conductors?

Great video. I have it saved to send to people i know that don't understand. I tried to explain it to a guy at the store one day when looking at a couple heaters same wattage one was the conventional cheap space heater the other was a fancy $$$ one and he kept thinking the $$$ one was more efficient... But I really can't fault those scam artists. Those that fall for scams are ones that don't educate themselves on what they are buying coupled with a lack of useful education that education systems no longer teach. Oh and Altium still has you on their payroll. Half your videos I watch nave an Altium ad in front of it.

15:09 Now I see how respected Super-Genius made his sunglasses-effect. This thing converts geeky glasses into badass sunglasses! Nice!

@paulnero3885

5 жыл бұрын

How did you comment 12 hours ago? Did he reupload the blog?

@EEVblog

5 жыл бұрын

Paul Nero - Patron and forum supports get to see the video early

@paulnero3885

5 жыл бұрын

@@EEVblog ahh, forgot about that

@NiHaoMike64

5 жыл бұрын

I don't think we should refer to Dave by the nickname "Super-Genius" even though he is, since that may cause confusion with an unrelated female who calls herself that.

Everyone watching this should read The Last Question, by Isaac Asimov. 20 min read, best short story ever written.

@vaalrus

5 жыл бұрын

Or the reading Leonard Nimoy did, if you can find it. It was on youtube at some point.

@DadSkool

5 жыл бұрын

well im not going to read it but am listening to Asimov read it to me now on youtube. Thanks, i think, ill know in half an hour

@CafeElectric

5 жыл бұрын

kzread.info/dash/bejne/oZ5504-thM3Jk5M.html

@Northern5tar

5 жыл бұрын

Great story yes. This lecture explores the scenario (sort of): kzread.info/dash/bejne/e3pot8p-nLW7dso.html

Really great video! Thermodynamics very well explained in a comprehensive way, and en passant debunking the SOLUS bullshit.

@EEVblog

5 жыл бұрын

Nice chess reference!

Hi Dave. Good video. I'd love it if you'd do some more AudioPhoolery busting. There's a lot of that out there. I know you've done a bit of it already, but that is a large pond to tap... ;)

@samgab

5 жыл бұрын

@School's Out: Screw Around eg: EEVblog #29 - Audiophile Audiophoolery

@khronscave

5 жыл бұрын

@@samgab Well, i'd argue Ethan Winer did / does a pretty good job of it. kzread.info/dash/bejne/qaOJmMGJldvVmpM.html kzread.info/dash/bejne/jKqd1MeuYratirA.html

Thanks for the wonderful dose of clean and simple physics facts! I love my mini-split heat pump. I realize you can only cover so much in one video, and I also look forward to the day when you cover heat pumps that are running with a COP of 3+ since it's such a great way to compensate for climate breakdown. 3 to 4 times the effectiveness (can I call it efficiency?) of a space heater is a really powerful change to the bottom line of heating. It ends up being almost half the cost of natural gas in my region.

where would in floor heating fit ? . conduction from the water or electric elements heating the slab or convection of the air moving through the room over a heated floor ?

Hey Dave, could you do a video on the Intel 8051? Compare and contrast it to the ATMega328, if you could please.

I'm glad to finally know that heat pumps can be more than 100% efficient (as in they pump more heat than they use in energy). Though I still don't know the maximum efficiency ever achieved and I'd be willing to bet there are differences in how much you can pump based on circumstances.

Thumps Up Dave! As i was watching your video i made some simple back of the envelope calculations. Here in Athens Greece were i live it's winter time, i live in a multi-storey building apartment and the central heating is on. We use hot water "radiators" fired up by a heating oil boiler. Our Boiler is rated at 120.000 Kcal/hr (that's a unit of power, a Kcal is the energy needed to increase the temperature of a kg of water by 1 °C, So it's convenient for calculations although it's not an S.I. unit of measurement). So i estimated the heated apartments in our building to be about 1500 m², So it's about 80 Kcal/hr per m² of heated space. Since my small apartment is 75 m² my "share" of heating "power" is 6000 Kcal/hr or ~6,97 kW. I also got two air conditioners rated at 12.000 BTU/hr each (3.5 kW). So my ACs power equals the "capacity" of my radiators! Ain't Thermodynamics Fun?...

Likely a good point to bring up (along the lines of "reaching equilibrium" as everyone always glosses over thermal resistance) is that the thermal resistance of any "insulation" is proportional to the thermal gradient across it. If a surface (like a wall) "loses ~500BTU"; that value is only valid at one fixed temperature ratio. If the temperature on both sides of a surface are already equal; the "insulation value" increases dramatically; while the opposite is true for large thermal gradients. Using oven mitts as an example: prior to use (assuming a room temperature of 23°C); oven mitts have a 1:1 temperature ratio between the surfaces; but when you pick up a ~190°C pan suddenly the ratio becomes ~8:1 and the thermal resistance "drops" (the actual resistance value stays the same; but the thermal pressure increases; driving total energy into the material at a faster rate) so that the rate of change increases. This is why "increase the temperature of a room by X°C" calculations are always messy; as the temperature of the room increases beyond the exterior temperature it takes more and more energy to maintain that new state.

Heck I always thought ceramic heaters were a lot more efficient than a coil wire heater; same with oil radiators... Wow you learn some new everyday.

my AMD pc keeps my bedroom very warm. so warm i have to crack the window during the winter. during summers i duct AC thru it so its not cooking me while i sleep. never been a "fan" for radiant heaters.

Kogan wants you to know that its tower space heater: * DC motor offers quiet operation and greater energy efficiency * Eco function delivers improved heat control and transfer

I was considering that you didn't have an example of conduction heating and I eventually thought of electric blankets, heating pads, and seat warmers... Not strictly space heaters, but certainly person heaters and as effective as IR.

Please do a a video on heat pumps! I got one after heating my house with radiators for a couple of years and my electricity bill is about 3/4 now that I have a heat pump and I want to know how it works!!! Thanks!

@DerpyMail

5 жыл бұрын

Pretty much a heat pump is an air conditioner in reverse.

Is the Heating mode of an AC just a space heater ? I never thought of it like that for some reason :P Maybe there are some differences that i'm not aware of...

Hey, Dave.. Can you make a video comparing the two cheaps type of hot air rework station, one with a pump in it and other with a cooler in the heatgun.. What's better and all those stuffs.. It would help me a lot!

BTU and W or J they are not always equivalent in all heaters systems (it is true only if Coefficient of performance is 1). In Air Conditioner you have COP more then 1 ( more than 100% efficiency) and for 1000w from the outlet you can have 10.000 BTU

I would really like to see you go into more detail about thermal properties of heatsinks with much more practical experimental examples on the bench. Get into junction to case, case to ambient, etc... and more importantly SHOW the temperature rise difference in different use cases with real ICs, perhaps letting the smoke out of a few as a good example of insufficient heatsinking.

Best fan-forced space heater I've ever had is by Vornado.

So if you use "Glass-ceramic" as used in Cooktops, wouldnt that work instead of ordinary glass...?

so a heat pump would be conduction and forced convection pretty much?

@johnfrancisdoe1563

5 жыл бұрын

john Rigby It's forced convection in a pressurized tube system where the pump uses changes in pressure to have the same energy but different temperature in the two "radiators" (inside and outside). An electrical fridge is literally a heat pump attached to a closed box, with the direction set to move energy from inside to outside.

Thanks for going the extra mile and explaining things further on this video Dave, really appreciate it. The debunking video was very justified, but it left me a bit confused while looking into things further. o/ Let me ask a question though on the matter. Say I don't care about heating the entire room, I care only about "feeling warm", or perhaps my house/room just has absolutely craptastic insulation... wouldn't it be best to invest in infrared heater instead? Of course, I see the limitations... it's highly directional, the effect probably tanks super fast if I turn it off, and overtime you likely end up wasting far more power because the heat is constantly going away (again, because of poor insulation). But kinda like the edge case of IR heaters on external areas for short durations, could IR heaters be better depending on what exactly you want? I think this is also why those quartz tube heaters are very popular here in Brazil, in cities that even need them that is, down south. Apartments and houses in Brazil have extremely poor insulation properties because well, we really don't have snow, and for the vast majority of the country we barely have something that could be called winter. :P The city I'm currently living in actually gets to the single digit celcius, something most cities don't get (we're in high altitude half way south). So, space heater aren't all that great a solution given there is no insulation to contain the heat. We have the cheap-o forced convection heaters... usually good for very cramped spaces like restrooms and whatnot. But for big areas, people are more likely to invest a little more and get an IR heater, the ones with quartz rods, and blast them directly to your face or something. xD Kinda like, the room won't get warmer anyways, so at least an IR heater helps you feel a bit more comfortable. I heard of floor heating systems in my city, but of course that's for the obscenely rich... Brazil doesn't have a tradition on it, so these systems are all imported, which makes them waaay more expensive. On the other hand though, and perhaps this is only personal perception, the problem with IR heaters is that since you are using infrared radiation blasting at your face to feel warmer, it's just also kinda harsh on the skin. I mean, it's not UV radiation, but still... skin dries up and all. A proper room heater plus a humidifier would probably be less problematic. But man, I'd love to still have some think insulation plus double layered windows, doors with proper sealing and all that... if not for the cold months, at least for the friggin noise... kinda like to live in one of those super thick walled storehouses in Japan. :P

My cheap 1500 BTU $250 electric fireplace uses all 3 types of heat transfer. It has a quartz IR lamp shining on an aluminum heatsink with a fan blowing out warm air.

Does a campfire give off "radiation"? You get the same effect from a large outdoor fire. Is it throwing off the same type of radiation? Thanks.

Would IR effect my Oculus rift sensors ?

👍👍👍 Very good presentation and explanation coming from a guy who spent 2 1/2 years taking thermodynamics fluid dynamics just for the HVAC industry and spent the last 30 years doing calculations for installing the equipment I sell. The small electric heater with all their fancy color brochures and BS marketing is just that a bunch of BS. And comparing efficiency using electricity heat pumps are 4 to 5 times more efficient then electric inductive heaters. But that’s a whole Nother discussion and video on heat pump and grabbing in removing energy from the cool air outside of your house and moving it into your house using less power watts per BTU then indinductive heaters

@EEVblog

5 жыл бұрын

Thanks

Modern double glazing uses windows are filled with argon gas instead of air as it insulates better. Also a lot of windows these days have reflective coatings to either keep the heat inside or keep the sun out. In cold climates the cavity of a double brick wall is filled with insulation material, sometimes as thick as 150-180mm. Thermal bridging in the building envelope can also be a problem, protruding concrete structures as balconies are good example of that. There even exist special rebar anchoring systems with integrated polystyrene insulation to separate the interiour concrete structure from the outside structure, all connected with stainless steel rebar. I’ve always wondered if they use much thermal insulation in australia to keep the interiour cool. In the netherlands we’ve got a bit of a problem that buildings these days are designed to have good insulation for winter conditions but with global warming we’re getting hotter summers which is a bit of a problem as we tend to have big window panes which will heat up the buildings in the summer to unbearable tempratures😅.

Good video. The part starting at around 26:45 was not that clear as that calculator calculates the room/house losses knowing the volume of the room thus area that will result in losses based on the level of insulation and the temperature delta between inside the room and outside. So say the room was not heated at all and you have no electrical devices inside not even a fridge or a light bulb and there are no windows facing the sun so you do not get any gain from that and there is no person or animal in the room then room temperature will be the same as average outside temperature (say outside temperature is +12C all the time) then inside temperature is also 12C. Now say losses of that room at a 10C delta are 1250W then if you add a heater to that room that uses 1250W then after some time the room will get at 22C the amount of time it will take will depend on how much thermal storage is in that room (furniture, wall construction all will have some amount of thermal inertia). After some hours or days the room will get to 22C and then if outside temperature is always at 12C the room will stay there as soon as you have that 1250W heater working (no thermostat or anything). Now when you stop the heating the room will start to cool down back to the outside ambient temperature and how fast it will cool will again depend on the amount of thermal storage in the room but will be the same amount of time it took to heat. Now if the outside temperature drops to +2C then in order to maintain the same +22C inside the house you will need 2x as much energy so 2500W as that will be the loss of that room at a 20C delta. If that is a room that you only occasionally use and want to increase the temperature y 10C delta then you will need a much more powerful heater so that air is heated fast and then have a thermostat so heater stops when it gets at that temperature and just cycle ON/OFF to maintain the temperature there. So say you have a 5000W heater it heats the air in the room by 10C in maybe one hour then it will just cycle ON/OFF at about 25% duty cycle in order to cover the losses after it got there. So for this occasional use of the room a fan based heater will work best as it will more uniformly heat the air in the room faster where a oil radiator type will be better when room needs to be permanently heated as it will be quieter and last longer with no mechanical moving parts where an IR heater is best in bathroom/showers since you want to be directly heated and it will feel more comfortable. Even in Australia much more energy is needed for heating than it is needed for cooling.

If I am not mistaken. Meteorologist put there thermometers in a box painted white and is vented to air. This to keep infra red from affecting readings from the sun.

God staf . All the best .

This was great. I'm always confused about convection. It seems to me that whenever we talk about convection we ignore half of the story. Convection refers to the movement of liquid or gaseous molecules through space. This is due to buoyancy, specific gravity, air pressure... all that stuff. So the hot air molecules will rise, leaving behind a bit of vacuum, and convection currents will distribute them around the room. I get that. But how do the air molecules get hot in the first place? It seems to me that those air molecules were heated by conduction. At first the space heater is bathed in cool air. Then the heat is transferred to the adjacent air molecules by conduction... not convection. Only then will the forces of air pressure start to convey the air molecules around the room. Eventually when the convection current brings the hot air molecules to the other side of the room, they can again transfer heat to a person or a chair or whatever... but again, through conduction. So conduction occurs at the origin and the destination, while convection occurs in between. Do I have that right??

@cedricpomerleau5586

4 жыл бұрын

SciPunk215 My teacher explained convection as conduction. It’s just that it moves because it’s a gas, so it helps the heat transfer. But it’s definitely conduction between the molecules.

Is IR heating alpha radiation?

You da man!

Dave are you growing a stache?

@EEVblog

5 жыл бұрын

Nope, just didn't shave that day. Probably the angle of lights highlights it.

@urdnal

5 жыл бұрын

@@EEVblog Try it, you'd look good.

@christopherhauck4702

5 жыл бұрын

@@urdnal +1x10^100^100

That fan heater at 4:01 is identical to the one I have. Placement of radiators is so important. I have the fan heater because of badly placed radiators, not by my choosing. [Edit: Timestamp]

@17hmr243

5 жыл бұрын

Use the semicolon to time stamp : and add 0 for seconds 1:06

@Flymochairman1

5 жыл бұрын

@@17hmr243 Done. Cheers.

Which heating method is best depends on the use of space. I see people putting in forced air heaters and even heat pumps to heat their normally unheated shop/garage. This is fine if you've got the insulation or the big unit, and will need the space warm for a long period. But for quick work, and cheap warmth, infra-red/thermal radiation is the way to go. Usually localized over the workspace. Convection would take forever to heat all the iron in a workshop. But a single incandescent bulb in a reflector can warm your hands and work. Put a reflective radiant barrier material rigged behind you to cut that cold mass of air in the rest of the space giving you a sense of a cold back and you can do quite well. Look at some of the old high wingback chairs used in front of fire places in manor houses back in the day. They insulated the back, accepted the radiant heat from the fireplace, in the front cut the convective currents drawing in cold air around the head. Some chairs even had a half dome on top to create a convectively warmed crown area for your head.

And don't forget the ambient temperature. I wonder how many BTU/hr it takes to keep the house warm at -38C ambient. Using natural gas and forced air convection to heat the home. Thank goodness the weather is getting better.

Would be nice if you made a video explaining how A/C works too :p and how it can have a higher efficiency (COP?) value than 1

@BerndFelsche

5 жыл бұрын

It's a heat pump. Makes it colder outside to heat inside and vice versa.

I like to remember heat radiation from when you're at a bonfire on a cold night. Your fronts roasting and back is freezing.

Pinkbatts and whirlybirds. I'm so confused.

Directly heat the place you are at is the most efficient way to do it. Don't stuck at heating up the room. Sure sometimes it's needed to heat up th entire room. In that case, using a fan to move the air is most effective. Heating up the walls and floor is less effective. But sometimes heating up from the floor is more comfortable because you get balanced heating from the bottom to the top rather than only heating up your head.

@EEVblog

5 жыл бұрын

But that's what IR heaters do, they heat up the walls and floor and furniture directly (ironically turning them into mini convection radiators), and you if you happen to be standing in the zone.

halogen bar heaters seem to use both convection and IR ...alot of heat comes off the bulb elements and goes straight up(hot air rises!), but also alot of IR (and a shitload of visible light!) that seems to directly heat objects and not the "air"