• What's happening there? Well, the selection of reactants has been done judiciously to provide either heat or to provide something that's cool.

    就会感到这东西,比如说变冷了,对吧?,这里发生了什么?这些反应物都是,被仔细的选出来的,能够提供热量或制冷

    麻省理工公开课 - 热力学与动力学课程节选

  • So it's a measure of how well we can do to run the refrigerator.

    这是衡量,我们运行制冷机的一个量。

    麻省理工公开课 - 热力学与动力学课程节选

  • And so, by and large, until this freon was invented by Midgley, there wasn't a good gas that had the right properties to be used for a refrigerant.

    因此,总的说来,直到Midgley发明氟利昂,没有一个气体,能被很好的用作制冷剂。

    麻省理工公开课 - 固态化学导论课程节选

  • And so instead of defining efficiency the way you've got it written there, I'm going to define what's called something different for a refrigerator which is called the coefficient of performance.

    现在我们不用,效率的那个定义,我给出一个,有关制冷机的,新的定义,叫做制冷系数。

    麻省理工公开课 - 热力学与动力学课程节选

  • So this is just going to be T2 over T1 minus T2, that's our coefficient of performance.

    这就是我们的,制冷系数。

    麻省理工公开课 - 热力学与动力学课程节选

  • Now to make that happen, it's not adiabatic, right. If I wanted to do that, I'd need a heating element or something to cool, so I could make that temperature change happen, right.

    要实现这点,它就不会是绝热的,对吧,如果我想做到这点,我需要一个加热元件或什么制冷的东西,这样我才能让温度变化。

    麻省理工公开课 - 热力学与动力学课程节选

  • You break the seal between them and feel the thing get cold, for example, right.

    如果你买了制冷或加热包,你打开它们之间的封条。

    麻省理工公开课 - 热力学与动力学课程节选

  • So you know, what the second law is doing, in other words, it's putting these restrictions on how well or how effectively we can convert heat into work in the case of the engine, or work into heat extracted in the case of a refrigerator.

    你们知道,在热机中,热力学第二定律的作用,换句话说,就是给热量,转化为功的效率,施加限制,或在制冷剂中,对抽取热量,进行限制。

    麻省理工公开课 - 热力学与动力学课程节选

  • we can run the engine backward and build a refrigerator, if you've got your lecture notes from last period your 8-9, well, they're labeled 8-9 lecture notes, I made an attempt to define something which was a little bit misguided.

    现在我们可以把热机倒过来,制作一台制冷机,如果你们拿出上节课的笔记,也就是8-9节,好的,他们在8-9节,当时我试着,定义了一些,有些误导你们的物理量。

    麻省理工公开课 - 热力学与动力学课程节选

$firstVoiceSent
- 来自原声例句
小调查
请问您想要如何调整此模块?

感谢您的反馈,我们会尽快进行适当修改!
进来说说原因吧 确定
小调查
请问您想要如何调整此模块?

感谢您的反馈,我们会尽快进行适当修改!
进来说说原因吧 确定