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首页 > 通知公告 > 电动机效率突破100%,是不可能的

电动机效率突破100%,是不可能的

电是高层级能量、机械能同样是高层级能量,所以电转机械能、效率最差都能达到90%左右,所以电动机效率自然就高!

2022-12-13

详细介绍

如果发动机的热效率达到100%.,那么则等同于遵守热力学的第一定律、而违反了热力学第二定律;首先要区分的就是功与热,功可以完全转换成热(百分百)、而热则不可能完全转换成功,热转换成功的过程中、是必然存在热量向冷的一方损耗的现象,部分热量向冷传播、那么就不能完全转换成功,虽然功与热的单位都是焦耳!

但功与热完全是不等价、两个层级的能量,热可以看作是最初级能源;而功或者说是以功为基础产生的电能、机械能则为高层级能量,高转低、转换效率很容易达到100%.,但低转高则做不到!举一个很简单的例子,过去家里做饭用的电热丝、就可以百分百的将电能转换成热能(但不代表所有的热量都能用于给饭菜加热);但反过来用热量转换成高级别能源,比如用热量去发电、用热量去推动活塞,必然存在大量的热被损耗掉,因为热量总是奔着低温传递;总不能让环境温度比发动机内温度还高吧?

这实际上也就解释了纯电汽车效率为什么那么高,电车效率涉及电转换效率、机械效率(电机效率就是二者乘积),内燃机效率涉及热效率、燃烧效率、机械效率,内燃机效率其实就是三者乘积;重点是机械效率、燃烧效率都能达到95%左右,但热效率只有34%(指的是平均热效率,别拿峰值说事),这样一来低热效拉低了发动机效率,即便燃烧、机械效率都很高,这就是热转机械能、低转高的尴尬;那么电机呢?电是高层级能量、机械能同样是高层级能量,所以电转机械能、效率最差都能达到90%左右,所以电动机效率自然就高!

热力学第一定律阐述的观点是能量守恒,在这个观点下功与热则是等价的,那么热就等同于可以百分百转换成功了、那么热效率也就能达到100%了,但这就存在问题了、后来在卡诺定理的基础上补充了热力学第二定律,也正是这第二定律彻底断了内燃机热效率达到百分百的希望;

T1为高温热源;T2为低温热源;

那么结合公式,低温热源温度越低、高温热源温度越高则热效率越高;但重点是低温热源永远不可能为零,这样一来公式中的分子永远不可能为零、结果就是内燃机的热效率永远都达不到1、也就是100%,试想一下低温热源为零的概念是什么?简单点说就是不存在任何一丝热向外排,比如排气管温度为零、发动机温度为零(暖风也没了),可燃料燃烧必然要产生热、没热就没办法形成高温热源T1了,可一旦生热、必然向低温处传递从而也就产生第二热源!

所以这就存在一个矛盾了,若是想让低温热源为零、燃料燃烧就不能产生热,而燃料燃烧不产生热、就不存在高温热源,没高温热源还谈什么热力?热效率自然就为零了,所以在咱们这个位面上、是不存在热效率达到100%.的内燃机的,更没必要谈达到了会怎么怎么样,这种猜想是毫无意义的;如果内燃机热效率达到百分百,那么燃烧室的温度如同核聚变反应时的温度、而排气温度却低得离谱(假设没有温度),所以这可能么?什么样的材料能承受住聚变反应时的温度呢?

所以就咱们的位面而言、内燃机效率达到百分之百是不可能的,因为现有热机、内燃机的研发都是基于热力学第二定律,延着热力学第二定律发展成的当代内燃机体系、是根本没办法跳出第二定律的限制的,所以热效率想达到百分百是不可能的;除非是产生全新的理论体系作为支撑,要不然未来的内燃机依然会被热力学第二定律牢牢束缚;高热源温度T1与低热源温度T2的差距越大、热效率越高,只有低热源温度为零时、热效率达到百分之百,但T2如果为零、那么则等同于燃料燃烧不产生热,而不产生热则高温热源T1也不存在了,所以结合卡诺循环、内燃机热效率达不到100%!