热量和功，我还要引入一个新函数。

And I also want to introduce one new function.

youdao

所以，再一次说明，对于热量和功，我们得到的结果是不同的，现在让我们看看我们的特殊函数。

So again, for both heat and work we don't get the same result. Now let's look at our special function, right. So here's path a.

youdao

目标函数为计算期内单位供热量的节约额现值。

The objective function of the optimization is the saving present value per unit heat consumption during the calculation period.

youdao

All right, so this is the heat flowing in or out of the system, and these are all functions of state.

好的，这就是系统的热量变化,这些都是态函数。

麻省理工公开课 - 热力学与动力学课程节选

It's not going to be zero this time because we have non zero heat exchange between the system and the environment, right.?

热力学量，但是现在让我们看一下,我们的特殊函数，这次它不会是零,因为系统与外界的热量交换并不是零，对吧？

麻省理工公开课 - 热力学与动力学课程节选

And I also want to introduce one new function.

热量和功，我还要引入一个新函数。

麻省理工公开课 - 热力学与动力学课程节选