Comparative Study of Techno-economic Evaluation Methods: NPV and IRR as Examples

The NPV method and the IRR are two methods that enterprises often use when making investment analysis. most used indicators for financial feasibility evaluation of production, but there many conflicts in practical application. This paper compares indicators, explains reasons contradiction with specific examples, analyzes what more scientific should be different situations. meaning this research is to find out way using make technical economic on projects. Technical refers economy project scheme by a series criteria certain procedure manner, so as determine rationality scheme, select best technologically advanced economically reasonable. In evaluation, evaluating benefits reasonably determined.