该模型可用于分析压水堆核电厂U型管自然循环式蒸汽发生器的热工水力瞬态过程。
This model can be used to analyze thermal-hydraulic transient behaviour of inverted U-tube steam generators in PWR power plants.
因此，除大型热水系统或需要较高水温的情形，才选择强制循环式，一般大多用自然循环式热水器。
Therefore, in addition to large hot water system or need high water temperature of the situation, the only choice of circulating, most commonly with mandatory nature of circulating water heater.
酒店立面采用开放式走廊循环系统，改善走廊自然采光和通风，避免传统酒店走廊封闭和易迷路的缺点。
The hotel façade adopts an open-corridor circulation system which improves natural lighting and ventilation in corridors, eliminating the cloistered and disorienting nature of typical hotel corridors.
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