Points out that the cubic law of pump power is not valid for the cooling water system of central air conditioning for it is an open system. The static head should be the lift in a cooling tower.

指出集中空调冷却水系统为开式系统，一般不适用功率三次方定律，静压头应为冷却塔塔体扬程，并提出了冷却水泵变速时轴功率的计算公式；

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The design process of the open circulating cooling water system which is in the service of an iron and steel enterprise is described.

详细介绍了为某钢铁企业服务的敞开式净循环水系统的设计过程。

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