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Your iPhone uses more energy than a refrigerator - The Week -
2013-08-18 21:20:06 GMT
"How much energy does it take to power your smartphone addiction? ... A midsize refrigerator that qualifies for the Environmental Protection Agency's Energy Star rating uses about 322 kW-h a year, while your iPhone uses about 361 kW-h if you stack up wireless connections, data usage, and battery charging."
"All added up, Mills calculates that it now takes more energy to stream a high-def movie than to manufacture and ship a DVD of the same film."
I hope there is a miscalculation somewhere, especially with the DVD example.
if you dug into capex-es and opex-es of two different technology manufacturing, at some point you'll get stuck with phantasmagoric pile of EROEI aggregative calculations.
Come on, people, iphone 4s' battery has ~ 2.5 Ah battery at 3.7V, which gives us 9.25 Wh of energy capacity.
hmmm, battery is already 81kWh... 365 * 24 * 9.25 = 81030... wireless connections, data usage - dunno how to calculate BTS and rest of net
Note that efficiency of charging is probably 50-70%.
yes, but there is network and data behind - we don't know even approximately how much is burned in typical mobile network "per mobile", leave alone how much is burnt by data centers "per mobile"
Well, we don't know precise numbers, but we can make an educated guess. Transmit power is around 20W per antenna. Typical cell tower has 1-20 antennas and capacity of 100-150 voice channels. So transmit energy is about (20*10*24*365)/120 = 14.6 KWh Let's add 3KW for infrastructure (non-transmit) power consumption. This is (3000*24*365)/120 = 219 KWh So total energy consumption per voice channel is (9.25*365) + 14.6 + 219 = 237 KWh
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