The pumping unit supplying the tested models consists in one horizontal shaft centrifugal pump driven by a variable speed D. C. motor itself controlled by a thyristor speed drive.

供给水轮机模型试验的水泵由一个卧式离心泵组成，由一个整流器自控制的变速电机带动。

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For every unit of energy to drive the compressor, the pump yields four units of heat.

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