我国的电网电压为220伏、50HZ，在这样的环境下工作的中央空调称为定频空调。由于供电系统频率无法改变，传统定频空调的压缩机转速基本上不会改变，借助不断＂开、停＂制冷压缩机来调整室温，其一开一关中间容易造成室内温度时冷时热，并消耗比较多电量。
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