Handwarmer made out of PCB copper?

Lightium

Active Member

• Mar 9, 2023

• #2

It's a balanced equation. Research electric heating of a mass.

 

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Kerim

Member

• Mar 10, 2023

• #3

I guess you have an idea about the cross section of the copper track to find out its current density (A/mm2) at 10A.

 

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For The Popcorn

Well-Known Member

Most Helpful Member

• Mar 10, 2023

• #4

If you search "pcb heater design" on YouTube, you'll find several guys who have experimented with designing pcb heaters for several different applications.

 

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alec_t

Well-Known Member

Most Helpful Member

• Mar 10, 2023

• #5

Flyback said:

If we put 10A through it, how long will it take to heat up the copper to 180degC? (ambient is 25degC)

Click to expand...

Heat input = Watts x time.
Heat required = mass (m) x specific heat (sh) x rise in temperature (dt).
You need to know those parameters for each of the components of the system and also take into account insulation below the heater panel.

 

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Pommie

Well-Known Member

Most Helpful Member

• Mar 10, 2023

• #6

Your putting 50 Joules into your copper ( I²R = 10² x 0.5) That will give a ~150°C rise in one gram of copper in one second and it'll keep going until it melts. However, the weight of your copper is unknown (to us) and the rate of heat loss is also going to be a big factor.

Mike.

 

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Tony Stewart

Well-Known Member

Most Helpful Member

• Mar 10, 2023

• #7

It will take a lot longer to heat up an egg with 50 Watts than just the 2 Oz copper track which serves no purpose.

 

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Flyback

Well-Known Member

• Mar 12, 2023

• #8

Thanks,
...it seems to heat up almost immediately.

 

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danadak

Well-Known Member

Most Helpful Member

• Mar 12, 2023

• #9

Possible help -

Online Heat Transfer Simulation Software | CFD and FEA

SimScale's cloud-based software offers heat transfer simulation without leaving the web browser. Test and validate your designs now!

www.simscale.com

https://www.cadence.com/en_US/home/tools/system-analysis/computational-fluid-dynamics/fidelity/flow.html?utm_campaign=cfd_product_us_google_search_march_2023&utm_source=google&utm_medium=search&utm_content=cdn_paid_media&utm_term=Thermal_Heat&s_kwcid=AL!14272!3!649727523016!p!!g!!thermal%20modeling&gclid=Cj0KCQiAjbagBhD3ARIsANRrqEtGhnIAxvh2p5zqpaCFwB2sWOSC3uK_t0-XtBZJsrD-IFkNhguk2_QaAqJhEALw_wcB

Google "thermal simulator"


Regards, Dana.

 

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alec_t

Well-Known Member

Most Helpful Member

• Mar 12, 2023

• #10

Flyback said:

We are making an egg-fryer

Click to expand...

That's some serious hand-warmer (per thread title).

 

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Tony Stewart

Well-Known Member

Most Helpful Member

• Mar 12, 2023

• #11

The eggs do make a mess with a slight epoxy taste.

I've tried a hand warmer Lipo Glove. They are terrible even at 0'C and expensive. But mitts work fine due to the superior insulation.

 

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