Value can be directly calculated in terms of ROI (return on investment), which determines time-to-payback, as follows.
价值可以以ROI(投资收益)的形式直接计算，它以如下方式决定了偿还时间。
Fast investment payback from fuel, cooling water and makeup water savings Durable, time proven designs, built to take the punishment of continuous, 24 hour a day service for years.
快速的投入回报，可以从节省燃料、冷却热水和节省补加水中收回成本经过长时间证明非常耐用，可以经年24小时使用。
Payback: the point of time where an investment equals its net sales (in months);
Break-Even： 回收期：投资额等于净收入的时间点（以月为单位）；
Payback: the point of time where an investment equals its net sales (in months);
Break-Even： 回收期：投资额等于净收入的时间点（以月为单位）；
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