Читать книгу Automation of Water Resource Recovery Facilities - Water Environment Federation - Страница 43

The simple payback period is a relatively straightforward calculation in which the initial investment is divided by net annual savings. The underlying assumption is that the interest rate is 0%. The calculation is as follows:

Payback periods of less than 5 years typically are considered good investments. If the payback period is more than 6 or 7 years, however, the project task force should thoroughly evaluate the accuracy of all estimates before making a strictly economic decision.