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Thread: WCG in a tent and on two wheels |
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Thread Status: Active Total posts in this thread: 9
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Glen David Short
Senior Cruncher Joined: Nov 6, 2008 Post Count: 185 Status: Offline Project Badges: 
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I woke up in a tent in the Chilean Andes, and found my laptop still running WCG's Say No To Schistosoma - read more here
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
You're the man, that can confirm or deny if hi altitude (thinner air) crunching decreases or increases the operating temperature of the CPU... just curious if observational data matches theory, such as another one that Svante Arrhenius computed round about 1896.
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ryan222h
Senior Cruncher Joined: Sep 4, 2006 Post Count: 425 Status: Offline |
The temperature of the CPU should increase with an increase in altitude due to the air being less dense, therefore less effective air particles will be moving past the CPU cooler for cooling. However, the laptop may make up for this by sensing the increased temperature and speeding the fan up to compensate.
----------------------------------------The same effect should happen if the air is warmer or more humid as well, as these cause the air to be less dense Not sure what the altitude of our friend is in the Chilean Andes, but the pressure at 18,000 feet altitude is generally about HALF what we experience at sea level, thus a significant increase in CPU temperature should occur at this altitude due to much less effective airflow over the cooling device. Having said all this, I have not read Svante's theory or had personal experience. My hypothesis is that it will increase temperature depending on whether the cooling system will match the demand for CPU cooling Update: A major factor that I have left out of this equation is that the static air temperature decreases about 2 degrees C for every 1,000 feet of altitude. Therefore at 18,000 feet the temperature will be about 0 C when the temp at sea level is 36 C. This will undoubtedly lower CPU temperature. Whether the decrease in temperature will offset the decrease in pressure altitude is going to be a matter of testing. I think the answer to your question therefore depends on whether the same room temperature will be maintained at altitude as opposed to at sea level.  [Edit 3 times, last edit by ryan222h at Mar 2, 2012 5:18:41 PM] |
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JollyJimmy
Advanced Cruncher USA Joined: Aug 23, 2005 Post Count: 115 Status: Offline Project Badges: 
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Also consider ambient temperature. Most tents in high altitude locations have notably lower ambient temperatures then most houses at sea level (Northern Greenland excluded).
----------------------------------------"Air cooled" tends to work so much better when your machine sucks its coolant half a foot away from a layer of snow, rather than desert sand ... |
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Glen David Short
Senior Cruncher Joined: Nov 6, 2008 Post Count: 185 Status: Offline Project Badges:
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Mallku is at an altitude of 3125m (10,252ft). I don't know whether the operating temperature increases with thinner air - usually I use an auxiliary fan anyway under my laptop - which is a semi-rugged model (Durabook S-13Y). I used it without problems for months in Cusco, at an elevation of around 3400m (around 11,154 ft). However, I met people who had bought cheap netbooks, and their hard discs shattered, because it spins on a cushion of air, and the air is thinner up there. Apparently, this used to be a big problem with computers at altitude: more here: http://www.dfrsolutions.com/uploads/publicati...itude_Hillman-Blattau.pdf
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kateiacy
Veteran Cruncher USA Joined: Jan 23, 2010 Post Count: 1027 Status: Offline Project Badges:
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Thank you for the link to your fascinating blog! The photos are wonderful.
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nanoprobe
Master Cruncher Classified Joined: Aug 29, 2008 Post Count: 2998 Status: Offline Project Badges: 
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Thank you for the link to your fascinating blog! The photos are wonderful. +1 Fascinating is an understatement. 
In 1969 I took an oath to defend and protect the U S Constitution against all enemies, both foreign and Domestic. There was no expiration date.
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Former Member
Cruncher Joined: May 22, 2018 Post Count: 0 Status: Offline |
great blog indeed !
 Greetings to you from Santiago , drop me a message if you are still around in our Country Have a great day ! |
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Glen David Short
Senior Cruncher Joined: Nov 6, 2008 Post Count: 185 Status: Offline Project Badges:
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almost ten years later, Ive finally got around to making a YouTube video about that day... the bit about WCG begins at 1h04mins35secs https://youtu.be/GITctN8QyBY?t=3875
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