After retrofit of no. 1 circulating-water pump pole-change in Jiujiang power plant, energy saving effect is obvious, it can reduce service power rate and increase total economy of units operation.
九江发电厂1号循泵变极改造后节能效果明显，对降低厂用电率、提高机组运行整体经济性的效果显著。
Motor loss takes a large proportion in total power of pump when variable frequency pump is used.
水泵变频时电动机损耗占水泵总功耗的比例较大。
Aiming at the total economy of the system, the economies of the engine and the gas-heating pump are analyzed respectively. And the power and economy of gas-heating pumps are coordinated.
从系统总体经济性角度出发，分析了发动机的经济性能与燃气机热泵的经济性，同时协调燃气机热泵的动力性与经济性；
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