On 30/01/2017 20:10, The Natural Philosopher wrote:
> On 30/01/17 19:19, Jamie Kahn Genet wrote:
>> In this situation only practical solutions, are to outfit the Pi 3 with
>> an oversize heat sink of the sort one might salvage from a desktop
>> computer, or (since I desire a small case) a fan.
>
> well you could run the whole thing in a refrigerator.

You jest, but I did that for a day while investigating the thermostat on
the fridge. The wires to the waterproof DS18B20 temperature probes are
quite thick, so would break the seal, but the Pi (original 256MB Model
B) power cable is very thin, so I decided to put the whole thing in!

I was surprised that WiFi still worked from inside so I was able to
remote monitor it from another Pi, as well as logging to SD card. Taking
readings every minute showed the cycling of the temperature and the
effect of the door being opened. Having the whole thing in, also enabled
me to use a temperature and humidity sensor which produced some
interesting readings as humid air was cooled.

But back to the subject; running the Pi at an ambient temperature of
around 5C instead of 22C dropped it's idle temperature from 45C to 30C.
In another experiment I left it in the car during a night where it got
down to -5C but this only resulted in reducing the idle to 26C.
Unfortunately I didn't try stressing it under these conditions, to see
the affect on the maximum running temperature.

---druck


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