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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク London Underground cooling ： ウィキペディア英語版 London Underground cooling In summer, temperatures on parts of the London Underground can become very uncomfortable due to its deep and poorly ventilated tube tunnels: temperatures as high as 47°C (116 °F) were reported in the 2006 European heat wave. Posters may be observed on the Underground network advising that passengers carry a bottle of water to help keep cool. ==Source of the heat== The heat in the tunnels is largely generated by the trains, with a small amount coming from station equipment and passengers. Around 79% is absorbed by the tunnels walls, 10% is removed by ventilation and the other 11% remains in the tunnels.〔(Cooling the tube ) Rail Engineering, November/December 2007〕 Temperatures on the Underground have slowly increased as the clay around the tunnels has warmed up; in the early days of the Underground it was advertised as a place to keep cool on hot days. However, over time the temperature has slowly risen as the heat sink formed by the clay has filled up. When the tunnels were built the clay temperature was around 14ºC; this has now risen to 19–26ºC and air temperatures in the tunnels now reach as high as 30ºC.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「London Underground cooling」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.