To increase the head of bulb turbine, it is necessary to improve the runner blade design method and design high head bulb turbine with good energy and cavitation coefficient performance high.

欲提高贯流式水轮机的使用水头，应改进转轮叶片的设计方法，以设计出能量和气蚀性能良好的高水头贯流式水轮机。

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The coefficient of performance at cryogenic temperatures is typically 4-5%.

在性能系数在低温的温度通常是4 - 5 %。

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Comparing with traditional construction materials, the ceramic grain concrete possesses the advantages of smaller thermal conductivity coefficient, less weighty and better structural performance.

与传统的建筑材料相比，陶粒混凝土具有导热系数小、重量轻、结构性能好等优点。

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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

My charts on the coefficient of performance among stock sectors show lessened correlation, a good sign.

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