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I'd like to cool a Raspberry Pi 4 Modell B with passive cooling only. To get the heat away from the chip I'd like to use a heat pipe and radiator to distribute the heat. Something like this. My problem is, that I don't know how to dimension the heat pipe + radiator properly for RPi4 not overclocked and run under industrial conditions, means a temperature range between -40 to +85 °C. Does someone have experience and/or a recommendation?

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You definitely should not buy from the vendor you've linked to - this.

Why? Because they provide no spec sheet.

Repeat the following mantra 3 times each morning when you wake up:

NO SPEC SHEET - NO SALE!

You need thermal resistance and airflow curves which are typically derived empirically by the manufacturer. You could do this yourself if you had a laboratory and proper instrumentation, but if you had that equipment I doubt you'd be asking this question here.

This is crap - do not buy it. If you're still interested in heat pipes as a solution, you might peruse this answer for some more details & ideas.

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  • Totally agree on "You definitely should not buy from the vendor you've linked to - this. Why? Because they provide no spec sheet.". It was just an example ;)
    – thinwybk
    Oct 3, 2020 at 17:24
  • "You could do this yourself if you had a laboratory and proper instrumentation, but if you had that equipment I doubt you'd be asking this question here." Yes, that's right. I was looking for practical experiences or hints w.r.t. simulation (something like simscale thermal analysis but simpler.
    – thinwybk
    Oct 3, 2020 at 17:26
  • @thinwybk: I've not used simscale, so I can't comment on it specifically, but it can't be any more difficult than e-mag modeling of antenna structures, so it probably increases insights. I think the key thing to keep in mind re heat pipes is their primary function is to move heat from one place to another - not so much to dissipate it. They're fascinating devices. Oh - don't forget that RPi has a closed-loop Thermal Management System. This TMS adjusts your system performance based on its temperature.
    – Seamus
    Oct 3, 2020 at 23:45

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