EPANET++ is a free web application for modeling water distribution networks, an extension of EPANET.

方案对比

用图纸的副本求解“方案管理器”中每个已勾选的方案(除非已取消勾选,否则为全部方案),并为每个方案列表给出覆盖值个数、需水量倍数、总运行时长、水力时间步长、最低压力和最高流速。选择“水务”、“报告”、“方案对比”即可打开。对比在该框打开时开始,并在其保持打开期间每次编辑后重新开始。

它不会更改项目,当前打开的方案保持原样。

表格内容
方案方案的名称。打开的方案标有(当前已打开)。
覆盖值个数方案自身的覆盖值,计数方式与“方案”列表相同。需水量倍数之类的计算选项算作一个,与继承值相等的覆盖值也计入。
需水量倍数、总运行时长、水力时间步长方案求解时所用的数值,是方案自身的或项目的数值。稳态方案的时间步长显示为短横线。
最低压力某个节点处的最低压力,并附有其 ID 和出现的时刻。水库和水箱不计入,因为它们各有固定的水头。
最高流速某条管道或阀门中的最高流速,并附有其 ID 和出现的时刻。水泵不计入。
稳态方案与延时方案

总运行时长大于 0 的方案,通过 EPANET 引擎在整个时段内运行。其最低压力和最高流速是所有时间步中的极值,每个值都附有其时刻。总运行时长为 0 的方案,则在某一时刻求解。总运行时长是方案可以覆盖的选项之一,因此同一张表可以同时包含这两种方案。

Results by asset

Below the table, Results by asset lists one row per asset of the type chosen in Asset type, with one column for each checked result in each scenario, for example the pressure at every junction in Base, Max day, and Peak hour. A scenario with a total run time is read at the time step on screen, or at its last time step if its run ends sooner, and each heading shows the time read. A scenario that cannot be solved keeps blank columns and a note that says why, and a scenario that did not converge is marked (not converged) in its headings. Copy puts the table on the clipboard as tab-separated text, ready to paste into a spreadsheet. Download CSV saves the same table as a file. Both carry the units in the headings and the numbers in full, without the rounding shown in the box. The sign of a flow is the solver's internal direction sign. It has no use outside the solver except to show in this table whether a flow changed direction between scenarios.

注意事项
  • 无法求解的方案,会在两项结果的位置显示原因,例如某条管道停用后某个节点没有通往水源的路径。其他方案仍会被求解。未收敛的方案显示其最后的结果和一条消息。
  • 表格上方的“在每个方案中都相同”区块说明摩阻公式、单位、精度和最大试算次数。各方案之间不同的设置不列入该区块。
  • 没有合格或不合格的阈值。请对照所建模系统的设计准则解读这些数字。
  • “方案管理器”条目中给出的示例在 Net1 上对比了三个方案。
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