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computers / comp.sys.raspberry-pi / Re: Passive cooling Raspberry Pi 4 B

SubjectAuthor
* Passive cooling Raspberry Pi 4 BMarco Moock
+* Re: Passive cooling Raspberry Pi 4 BJan Panteltje
|+* Re: Passive cooling Raspberry Pi 4 BMarco Moock
||+* Re: Passive cooling Raspberry Pi 4 BPancho
|||`* Re: Passive cooling Raspberry Pi 4 BMarco Moock
||| +- Re: Passive cooling Raspberry Pi 4 BJoerg Walther
||| `* Re: Passive cooling Raspberry Pi 4 BThe Natural Philosopher
|||  `- Re: Passive cooling Raspberry Pi 4 BJoerg Walther
||`- Re: Passive cooling Raspberry Pi 4 BJan Panteltje
|`- Re: Passive cooling Raspberry Pi 4 BThe Natural Philosopher
+- Re: Passive cooling Raspberry Pi 4 BPancho
+* Re: Passive cooling Raspberry Pi 4 BJoerg Walther
|`- Re: Passive cooling Raspberry Pi 4 BBjörn Lundin
`- Re: Passive cooling Raspberry Pi 4 BDavid Taylor

1
Passive cooling Raspberry Pi 4 B

<ubg6sp$2smhc$1@dont-email.me>

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From: mo0...@posteo.de (Marco Moock)
Newsgroups: comp.sys.raspberry-pi
Subject: Passive cooling Raspberry Pi 4 B
Date: Tue, 15 Aug 2023 17:50:49 +0200
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 by: Marco Moock - Tue, 15 Aug 2023 15:50 UTC

Hallo!

There are many passive cooling housings available for the Pi4B.
Does anybody here have experience with them?

Does it also work properly in the summer with 35°C?

--
kind regards
Marco

Re: Passive cooling Raspberry Pi 4 B

<ubg7hi$4mb1$1@solani.org>

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From: ali...@comet.invalid (Jan Panteltje)
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Passive cooling Raspberry Pi 4 B
Date: Tue, 15 Aug 2023 16:01:53 GMT
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 by: Jan Panteltje - Tue, 15 Aug 2023 16:01 UTC

On a sunny day (Tue, 15 Aug 2023 17:50:49 +0200) it happened Marco Moock
<mo01@posteo.de> wrote in <ubg6sp$2smhc$1@dont-email.me>:

>Hallo!
>
>There are many passive cooling housings available for the Pi4B.
>Does anybody here have experience with them?
>
>Does it also work properly in the summer with 35°C?

I have a Pi4 8 GB with passive cooling (used to post this)
Room is 27 C, raspi is 71 to 72 C when not doing much.
Original Raspi housing.
I think the thing will trottle CPU speed at some point if it gets too hot.
There are little heatsinks mounted on the processor and 2 other chips

I also do have a Pi4 4 GB in an alu housing with fan, that housing inhibits any WiFi, but it is way cooler,
even under heavy load.
I think having a fan is better.

Re: Passive cooling Raspberry Pi 4 B

<ubg990$2rdqf$1@dont-email.me>

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From: Pancho.J...@proton.me (Pancho)
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Passive cooling Raspberry Pi 4 B
Date: Tue, 15 Aug 2023 17:31:29 +0100
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 by: Pancho - Tue, 15 Aug 2023 16:31 UTC

On 15/08/2023 16:50, Marco Moock wrote:
> Hallo!
>
> There are many passive cooling housings available for the Pi4B.
> Does anybody here have experience with them?
>
> Does it also work properly in the summer with 35°C?
>

I've got a GeekWorm Aluminum Case.

<https://www.amazon.co.uk/dp/B07ZVJDRF3>

Room Temp 23 C
Ri Pi Temp 60 C
Case External Temp 43 C

The quoted Pi throttle temp is 85 C

Pi workload = top reporting %Cpu(s): 55.0%, (viewing CCTV camera).

So I reckon it could take and extra 12C room temp.

I also have a little, 8cm, USB desk fan, I use for shifting heat from my
compute cupboard on a hot day. If I'm worried, I can put the case in
front of that. Today, within 5 minutes, fan on slow, it dropped the cpu
temp 15 to 45C.

Re: Passive cooling Raspberry Pi 4 B

<4t9ndil4tss72csg215psuaju5ud808e2s@joergwalther.my-fqdn.de>

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From: joerg.wa...@gmail.com (Joerg Walther)
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Passive cooling Raspberry Pi 4 B
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 by: Joerg Walther - Tue, 15 Aug 2023 16:35 UTC

Marco Moock wrote:

>There are many passive cooling housings available for the Pi4B.
>Does anybody here have experience with them?

Sure, I have the passive Flirc full body aluminum case, it works
wonderfully with the 4B, usually the temperature is below 60°C.

>Does it also work properly in the summer with 35°C?

While I haven't had 35°C in my living room because I leave the sliding
door into the garden open at night, so max. was ~27°C on the hottest
days around here I wouldn't expect the 4B to overheat at 35°C,
especially since it goes into throttling only at around 90°C, which I am
quite sure will never be reached with this case.

-jw-

--

And now for something completely different...

Re: Passive cooling Raspberry Pi 4 B

<ubgaqq$2tdod$1@dont-email.me>

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From: mo0...@posteo.de (Marco Moock)
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Passive cooling Raspberry Pi 4 B
Date: Tue, 15 Aug 2023 18:58:02 +0200
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 by: Marco Moock - Tue, 15 Aug 2023 16:58 UTC

Am 15.08.2023 um 16:01:53 Uhr schrieb Jan Panteltje:

> I have a Pi4 8 GB with passive cooling (used to post this)
> Room is 27 C, raspi is 71 to 72 C when not doing much.

What happens if you stress the CPU?

Re: Passive cooling Raspberry Pi 4 B

<ubh194$30itp$1@dont-email.me>

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From: Pancho.J...@Proton.Me (Pancho)
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Passive cooling Raspberry Pi 4 B
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 by: Pancho - Tue, 15 Aug 2023 23:21 UTC

On 8/15/23 17:58, Marco Moock wrote:
> Am 15.08.2023 um 16:01:53 Uhr schrieb Jan Panteltje:
>
>> I have a Pi4 8 GB with passive cooling (used to post this)
>> Room is 27 C, raspi is 71 to 72 C when not doing much.
>
> What happens if you stress the CPU?
>

In my case, stress-ng --cpu 8 took the cpu temp up to a max of 70C after
45 minutes, at which time it plateaued.

That was without putting the case in an external airflow. With the case
in a strong external airflow, the cpu temp went down to 50C, after just
10 minutes.

I assume you don't live at 35C without some kind of fan?

Re: Passive cooling Raspberry Pi 4 B

<ubhmpq$59ua$1@solani.org>

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From: ali...@comet.invalid (Jan Panteltje)
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Passive cooling Raspberry Pi 4 B
Date: Wed, 16 Aug 2023 05:28:25 GMT
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 by: Jan Panteltje - Wed, 16 Aug 2023 05:28 UTC

On a sunny day (Tue, 15 Aug 2023 18:58:02 +0200) it happened Marco Moock
<mo01@posteo.de> wrote in <ubgaqq$2tdod$1@dont-email.me>:

>Am 15.08.2023 um 16:01:53 Uhr schrieb Jan Panteltje:
>
>> I have a Pi4 8 GB with passive cooling (used to post this)
>> Room is 27 C, raspi is 71 to 72 C when not doing much.
>
>What happens if you stress the CPU?
>

OK, I types 'yes' in a rxvt terminal in X
Now its 23.7 C early in the morning
and the raspi goes to 83.7 C and throtles there....
xosview shows only 1 CPU at 100% and a load factor of 4

raspberrypi: ~ # vcgencmd measure_temp
temp=83.7'C

raspberrypi: ~ # vcgencmd get_throttled
throttled=0xf0008

Re: Passive cooling Raspberry Pi 4 B

<ubhnrg$36l2t$1@dont-email.me>

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From: david-ta...@blueyonder.co.uk.invalid (David Taylor)
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Passive cooling Raspberry Pi 4 B
Date: Wed, 16 Aug 2023 06:46:24 +0100
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 by: David Taylor - Wed, 16 Aug 2023 05:46 UTC

On 15/08/2023 16:50, Marco Moock wrote:
> There are many passive cooling housings available for the Pi4B.
> Does anybody here have experience with them?
>
> Does it also work properly in the summer with 35°C?

Marco,

I have a number of RPi 4 and not had a problem with them, but my maximum room
temperature has been just 29°C. None are being stress with CPU load. Keep
them out of the sun!

The best "housing" I've fund so far has been the Raspberry Pi 400 - the RPi
built into a keyboard.

--
Cheers,
David
Web: https://www.satsignal.eu

Re: Passive cooling Raspberry Pi 4 B

<ubhvat$37htp$5@dont-email.me>

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From: tnp...@invalid.invalid (The Natural Philosopher)
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Passive cooling Raspberry Pi 4 B
Date: Wed, 16 Aug 2023 08:54:05 +0100
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 by: The Natural Philosop - Wed, 16 Aug 2023 07:54 UTC

On 15/08/2023 17:01, Jan Panteltje wrote:
> On a sunny day (Tue, 15 Aug 2023 17:50:49 +0200) it happened Marco Moock
> <mo01@posteo.de> wrote in <ubg6sp$2smhc$1@dont-email.me>:
>
>> Hallo!
>>
>> There are many passive cooling housings available for the Pi4B.
>> Does anybody here have experience with them?
>>
>> Does it also work properly in the summer with 35°C?
>
> I have a Pi4 8 GB with passive cooling (used to post this)
> Room is 27 C, raspi is 71 to 72 C when not doing much.
> Original Raspi housing.
> I think the thing will trottle CPU speed at some point if it gets too hot.
> There are little heatsinks mounted on the processor and 2 other chips
>
> I also do have a Pi4 4 GB in an alu housing with fan, that housing inhibits any WiFi, but it is way cooler,
> even under heavy load.
> I think having a fan is better.
My experience with cooling electronics is that as long as air can get in
and out, and the air isn't much above 40°C and your kit can handle
internal temps of 100°C, you just need a ventilated housing. Or some big
fins and a heatsink.

Fans enable you to get about 3-5 times the cooling that convection alone
will net you. But take power and make noise.

Experience shows that it is extremely difficult to predict thermal
performance theoretically, as how the equipment is installed plays a
huge part.
My advice is suck it and see. If your CPU cores are over 100°C, then its
time to probably do something.

--
“I know that most men, including those at ease with problems of the
greatest complexity, can seldom accept even the simplest and most
obvious truth if it be such as would oblige them to admit the falsity of
conclusions which they have delighted in explaining to colleagues, which
they have proudly taught to others, and which they have woven, thread by
thread, into the fabric of their lives.”

― Leo Tolstoy

Re: Passive cooling Raspberry Pi 4 B

<ubicar$393nd$5@dont-email.me>

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From: mo0...@posteo.de (Marco Moock)
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Passive cooling Raspberry Pi 4 B
Date: Wed, 16 Aug 2023 13:35:55 +0200
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 by: Marco Moock - Wed, 16 Aug 2023 11:35 UTC

Am 16.08.2023 um 00:21:08 Uhr schrieb Pancho:

> On 8/15/23 17:58, Marco Moock wrote:
> > Am 15.08.2023 um 16:01:53 Uhr schrieb Jan Panteltje:
> >
> >> I have a Pi4 8 GB with passive cooling (used to post this)
> >> Room is 27 C, raspi is 71 to 72 C when not doing much.
> >
> > What happens if you stress the CPU?
> >
>
> In my case, stress-ng --cpu 8 took the cpu temp up to a max of 70C
> after 45 minutes, at which time it plateaued.
>
> That was without putting the case in an external airflow. With the
> case in a strong external airflow, the cpu temp went down to 50C,
> after just 10 minutes.
>
> I assume you don't live at 35C without some kind of fan?

True, but I will ask that to have a buffer.

I will look for a metal housing that has a connection to the CPU, so
the heat can spread to the entire housing.

Re: Passive cooling Raspberry Pi 4 B

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From: bnl...@nowhere.com (Björn Lundin)
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Passive cooling Raspberry Pi 4 B
Date: Wed, 16 Aug 2023 13:36:37 +0200
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 by: Björn Lundin - Wed, 16 Aug 2023 11:36 UTC

On 2023-08-15 18:35, Joerg Walther wrote:
> Marco Moock wrote:
>
> Sure, I have the passive Flirc full body aluminum case, it works
> wonderfully with the 4B, usually the temperature is below 60°C.

I also have a Flirc, in a 2 m2 closet.
it never reaches above 55 degrees summer or winter

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Re: Passive cooling Raspberry Pi 4 B

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From: joerg.wa...@gmail.com (Joerg Walther)
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 by: Joerg Walther - Wed, 16 Aug 2023 12:08 UTC

Marco Moock wrote:

>I will look for a metal housing that has a connection to the CPU, so
>the heat can spread to the entire housing.

This is what the Flirc case has, the entire case gets kind of lukewarm
when the Pi has to do some work.

-jw-

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Re: Passive cooling Raspberry Pi 4 B

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From: tnp...@invalid.invalid (The Natural Philosopher)
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Subject: Re: Passive cooling Raspberry Pi 4 B
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 by: The Natural Philosop - Wed, 16 Aug 2023 17:16 UTC

On 16/08/2023 12:35, Marco Moock wrote:
> Am 16.08.2023 um 00:21:08 Uhr schrieb Pancho:
>
>> On 8/15/23 17:58, Marco Moock wrote:
>>> Am 15.08.2023 um 16:01:53 Uhr schrieb Jan Panteltje:
>>>
>>>> I have a Pi4 8 GB with passive cooling (used to post this)
>>>> Room is 27 C, raspi is 71 to 72 C when not doing much.
>>>
>>> What happens if you stress the CPU?
>>>
>>
>> In my case, stress-ng --cpu 8 took the cpu temp up to a max of 70C
>> after 45 minutes, at which time it plateaued.
>>
>> That was without putting the case in an external airflow. With the
>> case in a strong external airflow, the cpu temp went down to 50C,
>> after just 10 minutes.
>>
>> I assume you don't live at 35C without some kind of fan?
>
> True, but I will ask that to have a buffer.
>
> I will look for a metal housing that has a connection to the CPU, so
> the heat can spread to the entire housing.
>
That works, but beware, still put vents in it for hot air to leak out

--
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Re: Passive cooling Raspberry Pi 4 B

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From: joerg.wa...@gmail.com (Joerg Walther)
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Subject: Re: Passive cooling Raspberry Pi 4 B
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 by: Joerg Walther - Wed, 16 Aug 2023 17:59 UTC

The Natural Philosopher wrote:

>> I will look for a metal housing that has a connection to the CPU, so
>> the heat can spread to the entire housing.
>>
>That works, but beware, still put vents in it for hot air to leak out

That is not possible, since the case is full body aluminum, there is
simply not a space for more than the RPi4, and, as the others who have
the same or a similar case stated, it is not necessary.

-jw-

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