离心泵的扬程又称为泵的压头，是指单体重量流体经泵所获得的能量。
Also known as the centrifugal pump lift pump pressure head, the weight of fluid monomer is received by the pump energy.
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；
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.
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