78Views3Replies

Author Options:

USB heater Answered

Hi everybody!
As sais in the title of the topic, I want to realize a USB heater. Let me introduce you to what I think.
Last week, I was in the store near high school with some friends, and one of them told me : "It would be cool if we could heat up things in high school, to have like a mini oven directly in our locker, working with battery."
Of course, the idea is not to install a oven in our locker, firstly because it would need an incredible battery, and secondly because it would be pretty dangerous....
So here is the idea : the goal is to heat up at least 2 chocolate breads at 60°C. The heating time is not very important, but it has to be under 40 minutes (a system will start the oven before our break). But here is not the most complicated : the oven has to get its power from a usb power bank(I can plug in 2 power banks if necessary).

To conclude, I have to fin a solution to heat approximately 1.5L,( but most of it is filled with air), at 60°C, with a power of a maximum of 20W.
I saw things to heat coffee by USB, would it work if I take the heating pad?

Also, I would like to know how much power I can  get from a power bank (in W), before it to heat too much.

Discussions

0
Toga_Dan
Toga_Dan

3 years ago

does your school offer chemistry? Metal shop? Home ec? If so, there may b othr options for heatin stuff. Hehehehe. Seriously.

0
Toga_Dan
Toga_Dan

3 years ago

how hot is the tap water at school? 60C is possible. Fill h2o bottl with hot, put in an insulated bag with yer chocolate bread, wait.

0
Downunder35m
Downunder35m

3 years ago

You can do it by simple math first....
A standard USB 1.0 or 2.0 port will supply a max of 500mA.
A USB 3.0 can supply 900mA, 1.5A if the connected device is recognised as a dedicated battery charger.
USB 3.1 offer the same power levels as USB 3.0.
So in the best case you would have about 4.5Wh available for heating...
And no 20W won't work at all as you only have a max (as a battery charger) of 0.9Ah at 5V available.
Would be easier to use the 12V rail from the power supply of the computer...