Degital Power Groupの元記事を読むと、一般論としてのスマホやタブレットの話をしていて、
Reduced to personal terms, although charging up a single tablet or smart phone requires a negligible amount of electricity, using either to watch an hour of video weekly consumes annually more electricity in the remote networks than two new refrigerators use in a year.(1) And as the world continues to electrify, migrating towards one refrigerator per household, it also evolves towards several smartphones and equivalent per person.
注釈は、
(1) New refrigerator 350 kWh per EPA Energy Star; ~700 kWh/yr weekly streaming HD from [network operations] + [network embodied energy] + [tablet embodied energy]; note, ignores data centers & end-use tablet charging: ~ 300 kWh/yr wireless network operations from HD video 2.8 GB/hr per Netflix, network energy ~2 kWh/GB. Note energy use varies w location (type/age equipment), system utilization (see Auer et al, “How Much Energy is Needed to Run a Wireless Network?” June 2012). Network energy ranges from 19 kWh/GB The Mobile Economy, 2013, ATKearney, to ~2 kWh/GB per CEET, The Power of Wireless Cloud, April 2013. Annualized embodied/manufacturing energy to produce tablet (details in this report) ~100 kWh/yr per tablet, and cell network operating energy equals annualized embodied energy of network equipment used for 5 years. Refrigerator embodied energy adds 5 - 10% to lifecycle energy use of refrigerator.
iPhoneやiPadはスマホやタブレットの代名詞？ (スコア:0)
元ネタはAppleの話なんかしてないんだけど、なんでjapan.internet.comの記事ではAppleの話になってるんだろう。
Degital Power Groupの元記事を読むと、一般論としてのスマホやタブレットの話をしていて、
Reduced to personal terms, although charging up a single tablet or smart phone requires a negligible amount of electricity, using either to watch an hour of video weekly consumes annually more electricity in the remote networks than two new refrigerators use in a year.(1) And as the world continues to electrify, migrating towards one refrigerator per household, it also evolves towards several smartphones and equivalent per person.
注釈は、
(1) New refrigerator 350 kWh per EPA Energy Star; ~700 kWh/yr weekly streaming HD from [network operations] + [network embodied energy] +
[tablet embodied energy]; note, ignores data centers & end-use tablet charging: ~ 300 kWh/yr wireless network operations from HD video 2.8 GB/hr per Netflix, network energy ~2 kWh/GB. Note energy use varies w location (type/age equipment), system utilization (see Auer et al, “How Much Energy is Needed to Run a Wireless Network?” June 2012). Network energy ranges from 19 kWh/GB The Mobile Economy, 2013, ATKearney, to ~2 kWh/GB per CEET, The Power of Wireless Cloud, April 2013. Annualized embodied/manufacturing energy to produce tablet (details in this report) ~100 kWh/yr per tablet, and cell network operating energy equals annualized embodied energy of network equipment used for 5 years. Refrigerator embodied energy adds 5 - 10% to lifecycle energy use of refrigerator.
ということなので、ネット上の電源ソースとしてはNetflixとかを参照してるみたい。
japan.internet.comの記事でも、引用部分は
「タブレットやスマートフォンの充電に必要な電力量は無視できる程度のものだ。だが、タブレットやスマートフォンで一年間、毎週1時間程度のビデオ視聴を継続すれば、リモートネットワーク（クラウド）では、新型の冷蔵庫2個分以上の電力を消費することになる」
とAppleにはちっとも言及してないのに、その前後の文章は全部Apple製品の話になってる。
japan.internet.comの中ではスマホやクラウドと言えばAppleしかあり得ないということになってるんだろうか？
Re: (スコア:0)
なんか計算がおかしい気もするけど...
ignores data centers & end-use tablet charging:で言ってる300kWh/yrって、2kWh/GBのwireless network operationで2.8GBの動画を毎週見た場合の電力量として
2kWh/GB×2.8GB×52週=291kWh/yr
と計算されてる気がするんだけど、これは2kWh/GB×2.8GBの電力が毎日24時間消費されていると仮定した計算？
2.8GBの転送が一時間で終わるなら、週あたりのwiress network operationの電力消費量はこの1/(7×24)で済みそうだが...