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第1436章 能量的价格(1 / 2)

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“搞光伏发电的人,和搞可控核聚变的人。”宋河揭晓谜底。

学生们若有所思。

“可控核聚变,我猜卢庚想到了,之前你说人类能利用的两大能量来源,第一个太阳,第二个就是核聚变。”宋河道,

“提高收入不外乎四个字,开源节流!人类目前能做的只是节流,想方设法少浪费一些照射到地球的阳光。核聚变则是开源,能量来自物质本身,相当于人类自造小太阳。”

“可控核聚变成熟了,就没别的能源什么事儿了,源源不断的超廉价能源,人类社会将迎来史无前例的巨变。”

“当然了,开源难度过大,什么时候搞定不好说。”宋河耸耸肩,“我们现在折腾的各种能源形式,其实还局限在节流的圈子里。”

“光伏发电,属于高效直接利用太阳能?”卢庚理解,“其他能量来源都有太多中间环节导致的损耗,而光伏发电直接由阳光变成电力,转化率会高一些?”

“一些?”宋河微笑,“可不仅仅是一些。”

“高的吓人。”相晓桐也点头。

“做个比较就知道了,最常见的农作物,猜猜光能利用率能有多少?”宋河问。

“我好像在哪看过……”虞半梦拼命调取记忆,“10%?”

“理论上最大光能利用率是10%,但实际上低太多了,以水稻为例,最主要的粮食作物,只有0.3%到2%。”宋河道,“其他植物基本也跳不出这个范围,农作物普遍的光能利用率上限也就是2%。”

“理论值和现实值差别你们应该能理解。”相晓桐在一边补充,“比如有些植物会病死,上面的叶片会把下面的叶片遮住,阳光不是均匀出现,不同植物能吸收的光范围也不一样,影响因素太多了。”

“而光伏发电呢?理论上光电转化效率极限能到40%,同样也受多种因素影响,比如光伏板上积灰,电池逐渐老化,各省各地区阳光量不同等等。”宋河道,“最后实际值是……20%!”

“十倍!”卢庚一怔,“同样一块地皮,种粮食能收获的阳光存款是2%,铺光伏板能收获的阳光存款是20%!”

“没错,十倍的差距,说到这有句题外话,空气合成食品会是一个极有前景的行业。”宋河点头。

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