On 2023-10-01 01:32, sms wrote:SS - 630 : 18.4 W/(mK) * // also referred to as "17-4".
On 9/30/2023 4:33 PM, badgolferman wrote:
<snip>
Do they test them against the most popular apps as rated on their own
App
Store?
What is odd about the "fix" to iOS 17 to address the overheating issue
in the iPhone 15 Pro/Pro Max is that if there really is some kind of a
problem with some of the apps that causes overheating by "overloading
the iPhone CPU" then why isn't the same issue occurring with the
iPhone 14 Pro/Pro Max with the A16 Bionic?
You expect the software package to be identical across different devices?
It's likely that these apps, whatever they are, are causing the A17
Bionic to run at maximum power which is too much for the thermal
solution in the iPhone 15 Pro/Pro Max to deal with.
Apparently no issue that can't be fixed in both iOS and some 3rd party
apps.
It was also odd to see that claim that the titanium frame will conduct
heat out the phone better than the stainless steel frame in the iPhone
14 Pro/Pro Max since titanium is a poorer thermal conductor. And if it
did conduct heat better then the outside of the phone would get even
hotter but the inside would be cooler.
Let's see. There are a range of stainless steel alloys with varying
degrees of thermal conductivity. Per Apple they use "Surgical grade" stainless in the iPhone 14. ( * ) below.
SS - 304 : 14.4 W/(mK)
SS - 347 : 14.3 W/(mK)
SS - 316 : 16.3 W/(mK) *
SS - 440 : 24.2 W/(mK) *
SS - 420 : 24.9 W/(mK) *
Titanium: 24.5 W/(mK) - better than SS 304,347,316 630. Same as 440
and 420.
This is in Watts per metre-Kelvin. Thus the thicker the material, less
the conductivity (obviously). For you non-metric folks, a Kelvin is a difference of 1°C with 0K at absolute 0.
Finding 1)
So, Titanium is a better heat conductor in the kinds of SS that Apple
likly used (the 440/420 are very hard SS so not ones you'd want to manufacture at large volume). And even if you used 440 or 420 it would
be the same thermal conductivity as Titanium.
*Denotes so-called "Surgical steel" - although there is no formal
definition of such.
Issue 2)
Further, It's not so much the thermal conductivity that matters as the
way the thermal management is designed: placing the hot components where their heat has a pathway to the outside via conducting material or other means.
Issue 3)
Further, since Titanium is stronger, you may need less thickness, thus
the heat transits across less of it - so more conductivity. This is speculation on my part..
It's likely that these apps, whatever they are, are causing the A17
Bionic to run at maximum power which is too much for the thermal
solution in the iPhone 15 Pro/Pro Max to deal with.
Apparently no issue that can't be fixed in both iOS and some 3rd party
apps.
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