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| The article introduces the system structure, operating principle and the characteristics of three operating modes of the hot-water heat pump unit of recovering cold energy, and compares and analyzes its power saving effect with other heat supply devices. |
中文意思：
介绍了余冷回收热泵热水机组的系统构成、工作原理以及3种模式的运行特性，并对其节能效果与其他热源设备进行对比和分析。 |
以下为相关句子列表(点击查看，可以看对应的解释）：
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