Pi 4 metal top of processor

Folderol · 2021-07-02T21:23:00+00:00

Does anyone know if this is *fully* isolated from the gubbins? Measurements with an ordinary digital meter suggests that it is, but I'd like to be sure. The unit I'm developing has a grounded diecast alloy case and I'd like to use this as a heatsink, ideally with a small strip of copper in direct contact with both, and just a smear of heatsink compound. -- W J G

Jul 02, 2021 22 Replies

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Folderol 5 years ago

All very interesting info folks.

Some numbers here, all deg C: Ambient temp. 22 Pretty much idle for 2 hours 60 Moderate load for further 30min 68 Max load for further 15 min 73

This in the enclosed metal box, with no other treatment.

What I'll try first is a 12V 30mm fan running at 7V blowing across the Pi This will be in about a weeks time as I'll off to the new Forest Folk Festi val on Wednesday :))

I'm not after arctic conditions - apart from anything else, cool the surface too much and you get into the thermal stress realms.

W J G

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Ahem A Rivet's Shot 5 years ago

Really hard to do - fans are easy(ish) you can rate their flow in free air, max static pressure and measure the noise and pretty much compare them from that. Chimneys are quite sensitive to design and conditions - a bit like the transfer ports of a two-stroke engine - a small change in geometry can make a large difference to the airflow.

Steve O'Hara-Smith | Directable Mirror Arrays C:\>WIN | A better way to focus the sun The computer obeys and wins. | licences available see You lose and Bill collects. | http://www.sohara.org/

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Martin Gregorie 5 years ago

Good example: compare output from, say, Shuriken 06, AD06 and Cyclon 06 - all running on 25% nitro and with the same 7x3.5 prop!

Martin | martin at Gregorie | gregorie dot org

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