Passive cooling, or how I misplaced a while experimenting

Howdy everybody! On this put up, I wish to share my ideas relating to cooling in telephones—and the head of my experiments as properly.

TLDR: I modified the ineffective "cooling plate" to make it extra helpful, and it <perhaps> helped. IMO concept of excellent passive (or energetic) cooling isn’t insane.

Earlier than we go to my heck of an invention, couple of ideas why this (or comparable method) isn’t ineffective. What’s the weakest level of warmth dissipation within the cellphone? It's how warmth is handed from cellphone to the air. Aluminium, titanium, glass – any materials is actually inefficient right here. So, the one approach to make it higher is both: a) use cooler to exchange heated air with room temperature air to maintain temperature distinction between floor and air as excessive as attainable (the upper temperature distinction between supplies, the extra warmth is transfered between supplies) b) enhance the floor space

However learn how to enhance the floor space? And right here I got here up with the next reply: aluminium/copper plate with heatsinks on it. Specifically, the next sandwitch: <cellphone glass floor, if attainable – connection to metallic elements> <some gentle materials that conducts warmth fairly properly, like thermal pad> <alluminium/copper plate> <some meterial to carry heatsinks (additionally ofc thermal conductive; ideally, heatsinks ought to be a part of the plate> <variety of heatsinks>

This sandwich will work higher as a result of the thermal conductivity of the weakest connection (glass-thermal pad) continues to be nice sufficient to warmth the entire plate and heatsinks (it's vital to have as much less as attainable air pockets between cellphone and plate). When they’re heated to a cellphone below load temperature (round 40° Celsius), the warmth dissipation between the air and this resolution can be better due to the elevated floor space contact.

Apparently sufficient, for warmth dissipation, I relied solely on air convection and didn’t account for radiation. As my later "analysis" (a chat with Gemini, take it with a grain of salt) confirmed, radiation really performs an enormous half in warmth dissipation, and glass radiates higher than aluminum. So, my resolution could hinger this radiation a bit bit.

Now, testing. I ran a number of occasions in a row (like 3-4) the 3D bench, wild life excessive stress check. My cellphone reaches peak rating of 5000. With out my resolution, cellphone drops to 2500-3000 (however apparently sufficient, in a single run, it was capable of maintain 3500 with temperature round 44°). With my resolution, the rating was 3500 on two consequative runs two occasions. The utmost temperature was round 41°. As I used to be too lazy to check it extra completely, I made a decision this was sufficient proof for me that this resolution works – nevertheless it's not sufficient to declare that this can at all times work.

And at last, my setup on second pic – the plate is pressuraised by Razer Kishi V2 to my cellphone (to scale back variety of air pockets), the sponge to not harm the controller.

If in case you have any key insights, I’d actually find it irresistible if you happen to shared them right here. I’m not an engineer, and I constructed this factor totally on instinct.