Re: dumping a lot of heat

On Mon, 9 Dec 2024 15:23:00 -0500, ehsjr <ehsjr@verizon.net> wrote:

On 12/8/2024 9:04 PM, john larkin wrote:

On Wed, 4 Dec 2024 22:32:33 +0000, liz@poppyrecords.invalid.invalid
(Liz Tuddenham) wrote:
 

john larkin <jl@glen--canyon.com> wrote:
>

I'm thinking about building a biggish rackmount dummy load box. It
would simulate series resistance and inductance. Part of the problem
is that it will need to dump a lot of heat.
>
We are using copper CPU coolers on PC boards, which are great up to a
couple of hundred watts, but I'd like to do a kilowatt or two.
>
https://highlandtechnology.com/Product/P945
>
It would take a heap of expensive extruded heat sinks and fans to get
rid of a kilowatt. At 1 K/W, a pretty good heat sink, that's 1000 degC
temp rise.
>
A small hair dryer can dump a kilowatt. So some sort of red-hot
nichrome coils and a vicious fan might work.
>
I'd prefer to not use water.
>
I wonder if there is some sort of runs-red-hot power resistor.

>
Cooker hob ring?
>

 
What's that in American ??!!

>
:-)
>
https://www.amazon.com/LXun-Electric-Included-Replacement-Whirlpool/dp/B08BLJYTD4/ref=asc_df_B08BLJYTD4?mcid=6a1fcb0f8a9b374fb92357f05f23bb39&hvocijid=12073860510026011302-B08BLJYTD4-&hvexpln=73&tag=hyprod-20&linkCode=df0&hvadid=692875362841&hvpos=&hvnetw=g&hvrand=12073860510026011302&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9004204&hvtargid=pla-2281435183338&psc=1
>

Oh, an electric stove heater element. At least one is usually broken.