压缩机节能改造不仅要满足管路系统流量、压头的需要，在确定降速幅度时还要进行喘振的校核。
Energy saving of centrifugal compressor not only satisfies the flux and pressure of pipeline system, but also verifies vibration when choosing the extent of lowering speed.
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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