Читать книгу Automation of Water Resource Recovery Facilities - Water Environment Federation - Страница 42

The following dissolved oxygen control example, in which the following cost estimates were made, will be used to demonstrate the financial concepts in this section:

• Initial investment = $500,000,

• Power savings = $200,000 per year,

TABLE 2.2 Life expectancies of typical control system devices.

• Additional maintenance requirements = $50,000 per year,

• Equipment life = 10 years, and

• Discount rate = 5% per year.