72

Is it possible to reliably run a Pi in an airtight (watertight) case or is some form of ventilation required for cooling? I'm assuming it doesn't chuck out too much heat, but am wondering whether running it indefinitely this way may cause issues.

  • 7
    This is a bit of a teaser - what use for an RPi needs a watertight case? – Jon Egerton Jun 24 '12 at 23:10
  • 1
    @JonEgerton As the brains for an off road robot or even a boat / submarine? – berry120 Jun 25 '12 at 0:17
  • 3
    Anything left outdoors like a weather station or spy^Wnature cam server. – XTL Aug 24 '12 at 6:54
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    Just thought I should note that the question doesn't actually give much information about what is desired. For instance, an airtight aluminum case floating in the Arctic Ocean is different from a polystyrene airtight case in your attic. A case can be airtight, but heat still has to escape. – Tai Viinikka Jul 3 '13 at 1:09
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    @TomiL problem with such copper case would be that it can work also opposite way - for example on direct sun. – Marki555 Dec 28 '14 at 0:51
70

There are no ventilation or cooling requirements.

This has been verified by an RPi admin here.

  • That topic is really confusing. It states you shouldn't dip the board in plastic, but that would actually help cooling since almost any material has better thermal conductivity than air. – Dmitry Grigoryev Oct 28 '16 at 7:44
43

Yes, under usual circumstances it should be possible to run the Raspberry Pi in an airtight case. I have measured some temperatures confirming that there is amply thermal headroom.

For reference:

  • 22°C room temperature
  • 42°C idle

I ran sysbench to stress the CPU:

sysbench --test=cpu --cpu-max-prime=20000 run
  • 45°C 20 s
  • 46°C 2 m
  • 47°C 5 m
  • 48°C 12 m

Since the temperature did not seem to raise any further, I put a paper hood over the CPU to simulate the "airtight case scenario".

  • 49°C 20 s
  • 50°C 2 m

After another half an hour there was no further increase of the temperature.

7

Based on my test Raspberry Pi runs relatively cool even when the CPU is 100% loaded for longer periods, so I think there shouldn't be a problem (I did not try loading the GPU though).

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