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Equivalent Annual Cost (EAC) is a financial metric used in engineering projects to compare the costs of different options over their lifespan. It helps in decision-making by converting total costs into an annual equivalent, facilitating easier comparison.
Understanding the Concept of EAC
The EAC represents the average annual cost of owning and operating an asset over its useful life. It considers initial investment, maintenance, and operational costs, adjusted for the time value of money.
Steps to Calculate EAC
Calculating EAC involves several steps:
- Determine the total present value (PV) of all costs associated with the project.
- Estimate the project’s useful life in years.
- Choose an appropriate discount rate to account for the time value of money.
- Calculate the capital recovery factor (CRF).
- Multiply the PV by the CRF to find the EAC.
Formula for EAC
The general formula for EAC is:
EAC = PV × (r(1 + r)^n) / ((1 + r)^n – 1)
Application in Engineering Projects
Engineers and project managers use EAC to compare different project options, such as equipment choices or maintenance strategies. It enables informed decisions by highlighting the most cost-effective solutions over the long term.