大氣層的成分主要有
氮氣占78.1％
氧氣占20.9％
氬氣占0.93％
因此用氮氣發電可行嗎？
liouyusin wrote:
以色列研發出世界首台100%以氮氣發電的綠能室外空調裝置
https://www.taitra.org.tw/News_Content.aspx?n=104&s=44586
剛剛特地去google這家公司( Green Kinoko )，
發現在YT有一則影片，
影片下方的留言還蠻有趣的。
我對這個沒研究，
所以就把比較有趣的留言貼上來，
讓大家自行去研判。
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Lets calculate how much this is a scam. Liquid nitrogen has 200kJ/kg heat of evaporation at -200 degree Celsius. To get to 0 degrees it takes about 200kJ/kg to get to 0 degrees Celsius (specific heat is ~1 kJ/kg).
So evaporating 1 kg of liquid nitrogen and cooling air to 0 degrees only absorbs 400kJ which is only 0.11 kWh. It "caries" (read takes) surprisingly little energy compared to water which takes 0.64 kWh per kg evaporated.
Now, a regular indoor split A/C has a rated cooling power of say 3 kilowatt. This device seems personal and sized like that and since it is outdoors it definitely would need similar cooling power.
So each hour it would consume 30 kg of nitrogen or 30 dollars per hour. You would probably have to replace the canister every hour. Price of nitrogen for small quantities would quickly be 1$ per kg.
Finally making liquid nitrogen will be done using energy at the plant itself and is only 50 pct efficient. So for each kW of cooling capacity it takes 2 kW. While for conventional A/C it takes 1kW for 3-4kW of cooling power.
So I hope this is the last we have heard from this disgusting product!
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以下是google的翻譯..........
讓我們來算一下這有多大的騙局。液態氮在攝氏-200度時，蒸發熱為200千焦/公斤。要達到攝氏0度，大約需要200千焦/公斤（比熱約為1千焦/公斤）。
因此，蒸發1公斤液態氮並將空氣冷卻至攝氏0度僅吸收400千焦，即0.11千瓦時。與水相比，它「消耗」（也就是消耗）的能量少得驚人，水每蒸發1公斤需要0.64千瓦時。
現在，普通的室內分離式空調的額訂製冷功率約為3千瓦。這款設備看起來很私人，尺寸也差不多，而且由於它安裝在室外，肯定也需要類似的冷卻功率。
因此，它每小時將消耗30公斤氮氣，即每小時30美元。你可能每小時都需要更換一次氮氣罐。少量氮氣的價格很快就會達到每公斤1美元。
最終，製造液態氮將耗費工廠本身的能源，效率僅50%。因此，每增加1千瓦的製冷量，就需要消耗2千瓦的電能。而傳統空調只需要消耗1千瓦的電能就能產生3-4千瓦的冷氣量。
所以我希望這是我們最後一次聽到關於這款噁心產品的消息！
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