The design and usage capacity of mobile handheld devices have advanced tremendous in recent times, from being used solely for audio calls to the recent incorporation of augmented reality in smartphones. These new smartphone applications are power intensive causing excessive heating in phone parts, primarily batteries and processors. In some cases, the temperatures of phones in use exceed the 45 C threshold temperature of discomfort. These undesirable high temperatures affect user experience and form the basis of ongoing studies to improve thermal management in handheld devices. This work analyzes the thermal profiles of three smartphone models A, B and C for common tasks such as music playing, voice calling, video streaming and 3D online gaming. Transient surface temperature distributions were obtained with infrared imaging and thermocouple sensors, while processor and battery temperatures were obtained from inbuilt sensors, for the phones operating with and without phone casings (test and control cases, respectively). Test results showed that casings generally inhibit the dissipation of the heat generated within the phone, leading to increased processor temperatures. Comparisons between thermal profiles for different phone casing materials showed that plastic casings caused the least temperature difference throughout the test duration, followed by silicone, carbon fibre and leather casings, in ascending order. The rises in processor temperatures during the test duration were compared for the different smartphones: the phone B had the least temperature rise, followed by phone A and then phone C. These gave indications of the power consumption by the phone processors when undertaking the test tasks.
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I think the plastic casing's advantages out weighs its disadvantages because these days, most smartphone uses hardly make or take audio calls and even when they do, it's usually with a headset or earpiece thereby reducing contact with the skin and avoiding the discomfort it comes with.
The casings that incorporate phase change materials are a really good idea but have casings like that been made or found their way into the market?
Applause is humbly received. Your comments are also well received on the fact that with the use of ear phones, the skin heating effects of phone casings are avoided. However this doesn't mitigate the deleterious effects of the heating on the internal components of the phones.
We shouldn't do away with phone covers, but be aware of the implications of their use on phone performances.
I want to ask which of the above mentioned phone casings is best for usage?
Our findings suggest plastic casings.
To ask, are plastic covers recommended above other types of covers?
The findings of the full study suggest this.
This is a very nice article.
I actually learnt something from this. I never new phone casing contributes in phone's heating.
Also it will help one in choosing the type of phone case to purchase..
Please Sir can you advice us on the type of phone casing to buy that its optimal for both heat and radiation?.
Our findings suggest plastic casings.
Very expository and informative on thermal radiation from handheld devices and the choice of material for phone casing.
Kudos to all the researchers involved.
Sir I will also suggest if you can also lay more emphasis on Radiation.
Great work sir!
If not, that's an area manufacturers need to look into to improve mobile phone user experience.
Very relevant research, kudos!
I'll be careful to use my earpiece or speaker more to keep the heat from being redirected to my face.
I'm not aware of any casings in the market that incorporate PCMs. It would be good that commercial prototypes are attempted.
Kudos again to the team!
I agree with you. There could be designs with openings next to the locations that experience over heating. This will also be a cheaper solution than the incorporation of PCMs.
Thanks for the new insight.
I hope the industry takes this on to consideration and standardise it. Thanks for enlightening us, so we look into the materials of phone casting before purchase