Hello Guys,

I have a small issue ,I want to build the same heater from the link below , but i dont know
how long the wire needs to be? and how can i know how to reach a specific amount of heat is there a relation or something ?

 

Super sketchy project. Don't bother.

It's dangerous, produces a feeble amount of heat, and would drain the battery quickly.

 

I'd answer the first question, but I agree with SensaCell. Very sketchy and dangerous.

Note: if you open the link in YouTube, you get a different video with more information...

Edit: Never mind. If you watch the linked video, the next video that appears is a similar project and had more information.

 

Gotta LOVE YouTube. Nowhere on earth can you find such bunk!

Yeah, technically it's a heater. MIGHT be able to heat one room in a Barbie & Ken Condo. The real danger here is fire. HEAT & PLASTIC ? ? ?

Want some sound advice ? Don't try to build this thing. You have no idea how much current the video is providing to the heating element, nor do you know how he's controlling it. All you see is a fan of some unknown voltage, probably 12 volts, hence the battery, but for the element to glow that brightly - you haven't a clue what that's connected to. And in the short video you don't see any proof of heating. All you see is a glowing wire inside a plastic bottle. Building such a thing is not smart at all.

Heat is a function of wattage. Wattage is voltage times current. Current is voltage divided by resistance. Controlling the resistance of a piece of wire that small is very difficult. Much easier to control the voltage. If the filament (I'll call it that for now - but it's just a piece of unknown metallic wire) has to have sufficient current to glow. Depending on the voltage applied and the current resulting you can calculate the wattage. With the known wattage you should be able to calculate the amount of heat produced, measured in BTUH (British Thermal Units per Hour). I don't know the formula for that, but just guessing from the size of the filament the BTUH can't be much at all. The heater I use to heat my home (2700 square feet) is in the thousands of BTU's. I don't know off hand exactly what my heater produces so I don't want to hazard a guess and look foolish for saying something stupid. But I bet the heater the guy built isn't capable of 10 BTUH. For a good explanation of BTUH, I'd suggest Google.

Don't try to reproduce this goofy toy heater. You may get more heat than you want. Like having to call the fire department out because your room is on fire while you lay there passed out from toxic gasses released by burning plastic.

 

I want that to heat my room in winter.
What do I need ?

 

Well... I used to have a big aluminum tray that I would throw a few cap-fulls of alcohol in and burn when I needed a quick warm-up in my room.

Much faster than that silly plastic melty-fire-bomb thing.

Maybe I should make a video?.....

 

I want that to heat my room in winter.
What do I need ?

You need to buy a room heater powered by the mains (no sensible sized battery is going to enough energy to satisfactorily heat a room) or, if you prefer, a calor gas heater.

 

I want that to heat my room in winter.
What do I need ?

The schematic pic of "boob"

 

Coal.

 

Oh Man....!
Seriously ?
You guys have no idea where I live ?

 

Just buy a heater. I have a propane heater rated for indoor use that puts out 18,000 BTU/hr for emergencies.

 

Oh Man....!
Seriously ?
You guys have no idea where I live ?

Give us a place then....Antarctica??

 

Wherever you live, unless it is already warm enough that utube thing is not going to help one little bit.

 

I was being sarcastic.
I live in a place where no Winter occurs.

 

... how can i know how to reach a specific amount of heat is there a relation or something ?

A length of hot wire has a resistance that is proportional to its length. It will be specified in units such as ohms per foot, Ω/ft. After you know that value, use Ohm's law: V = I•R. Rearranging that equation, I = V/R and you know both V and R (for a given length of hot wire).

The final thing you need is the definition of electrical power, P = V•I where the units are watts, volts and amps respectively. Plug in I above from Ohm's law and you get P = V•V/R = V^2/R. You know your supply voltage and you know the resistance of the hot wire, so you're good to go. Note that the cold wire will have a lower resistance until it heats up. So the current and power will be briefly much higher.

Now, this will tell the power dissipation from a length of wire. It won't keep you from getting too hot and burning like a fuse or staying too cool for your application. The heating wire likely has some specification for desired power dissipation per unit length, watts-per-foot perhaps. You should target some value less than that. If you exceed that, it'll burn up.

I agree with the other posts here that you risk burning your fingers or maybe even lighting a fire. Proceed with caution.

 

Is it a heater or an electric match.

 

Is it a heater or an electric match.

Yup, it's the same idea as the igniters used in model rockets.

 

60s and 70s....Estes rockets.....probably get arrested if you set one off today.

 

60s and 70s....Estes rockets.....probably get arrested if you set one off today.

In the wrong place, yes. But they're still for sale in the hobby stores and I made sure my kids got to set some off.

 

I've heard that low resistance resistors can be used as igniters.

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