電車真的比較環保嗎? - 汽車

By Joseph
at 2022-11-16T19:02
at 2022-11-16T19:02
Table of Contents
※ 引述《wisdom ()》之銘言:
: 從能源利用效率這個角度來思考
: 一度電是3600kJ
: 汽油的熱值是7800kCal/L=32760kJ/L
: 純電車一度電以現今的技術來看,跑7-8km算基本要求(我納N7的電耗是13度百公里,一
: 度電超過7km了)
: 就以7km每度電,可以算出每行駛1km消耗的能量是520kJ。
: 用這個能量消耗來評估燃油車(含油電)
: 燃油車的油耗需要達到63km/L,在能量利用上才跟純電打平
: 你舉幾台不用靠外部充電能達到這個條件的油電車來聽聽看。
: 台灣買得到的油電車,不依賴外部充電的話,沒有超過30km/L的,能源利用率連純電的一
: 半都不到。
: 的確能源利用率跟環保與否不會是完全直接相關(但有相關性應該不會有人有意見)
: 但兩倍的差異,你要在發電過程多不環保才能把差異追平?
這裡的計算方式對油車不公平
電動車的能量流程是這樣的
燃料的化學能-->熱能-->電能-->電池的化學能-->電能-->汽車動能
汽油車與油電車能量的流程是
燃料化學能-->熱能-->汽車動能
引文計算方式汽油車全程計入,電動車只計算電能轉換成化學能之後的那一段
正確的方式應該如下
1km消耗520kJ電能,火力發電廠熱效率以台電為準是46%
故該輛電動車1km消耗520/0.46 kJ的燃料,相當於一公升汽油跑29km
其實並沒有比油電車節省到多少燃料
--
: 從能源利用效率這個角度來思考
: 一度電是3600kJ
: 汽油的熱值是7800kCal/L=32760kJ/L
: 純電車一度電以現今的技術來看,跑7-8km算基本要求(我納N7的電耗是13度百公里,一
: 度電超過7km了)
: 就以7km每度電,可以算出每行駛1km消耗的能量是520kJ。
: 用這個能量消耗來評估燃油車(含油電)
: 燃油車的油耗需要達到63km/L,在能量利用上才跟純電打平
: 你舉幾台不用靠外部充電能達到這個條件的油電車來聽聽看。
: 台灣買得到的油電車,不依賴外部充電的話,沒有超過30km/L的,能源利用率連純電的一
: 半都不到。
: 的確能源利用率跟環保與否不會是完全直接相關(但有相關性應該不會有人有意見)
: 但兩倍的差異,你要在發電過程多不環保才能把差異追平?
這裡的計算方式對油車不公平
電動車的能量流程是這樣的
燃料的化學能-->熱能-->電能-->電池的化學能-->電能-->汽車動能
汽油車與油電車能量的流程是
燃料化學能-->熱能-->汽車動能
引文計算方式汽油車全程計入,電動車只計算電能轉換成化學能之後的那一段
正確的方式應該如下
1km消耗520kJ電能,火力發電廠熱效率以台電為準是46%
故該輛電動車1km消耗520/0.46 kJ的燃料,相當於一公升汽油跑29km
其實並沒有比油電車節省到多少燃料
--
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