For modeling and thermal calculating of the thermal system, it is necessary to numbering related equipment and pipelines in the model.

在对热力系统建模并进行热力计算时，需要对模型中的设备和管道编号。

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Then with the heater as example, the building procedures of the model library are described in detail, and the implementing mechanism of automatic numbering is presented.

以加热器为例，详细阐述了模型库的构建过程，并介绍了自动编号的实现机理。

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