Then, the exhaust heat from the bottom plate of the thermoelectric device would be used in the traditional way to warm water up.

其次，从热电设备中位于底部的薄片中出来的排气可以用于传统方式来加热水。

Its exhaust heat is 2 kilojoules at 300 Kelvin.

它的排热是2千焦耳 至 300 开尔文。

But there’s no such thing as an engine that produces no exhaust heat at all.

但是根本不产生废热的发动机是不存在的。

We know that work is equal to input heat minus exhaust heat.

非常简单地。我们知道工作是值得的 增加的热量减去消耗的热量。

If your engine produced no exhaust heat at all?

如果您的发动机没有释放任何废热 绝对地？

Like we said earlier, an engine’s input heat is equal to the work it does, plus its exhaust heat.

正如我们之前所说， 发动机的输入热量等于它所做的功加上它的排气热量。

So efficiency is equal to input heat minus exhaust heat, divided by the input heat.

所以效率等于增加的热量减去 用尽的热量，过热。

Like we said earlier, an engine's input heat is equal to the work it does, plus its exhaust heat.

就像我们之前说的，增加的发动机热量 等于完成的功+消耗的热量。

We can also put this just in terms of input heat and exhaust heat – pretty easily, actually.

添加。我们也可以表达 利用热量和排热。

Which can help if you don’t know an engine’s input and exhaust heats, but you know its operating temperatures.

如果您不知道发动机的输入和排气热量， 但您知道它的工作温度， 这会有所帮助。

But as the steam engine runs, it releases exhaust heat.

但是当发动机运转时， 它释放废气的热量。

But there's no such thing as an engine that produces no exhaust heat at all.

但是没有不启动的引擎 没有排热。

Which can help if you don't know an engine's input and exhaust heats, but you know its operating temperatures.

如果您不知道温度，这可能很有用 引擎添加和耗尽，但你知道两度。

We know that work is equal to input heat minus exhaust heat. So efficiency is equal to input heat minus exhaust heat, divided by the input heat.

我们知道做功等于输入的热量减去排出的热量。所以效率等于输入热量减去排出热量，再除以输入热量。

And the more work – and therefore, the less exhaust heat – you get out of the input heat, the more efficient your engine is.

工作越多 - 热量越低 筋疲力尽——你从增加的热量中获益。