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Considering electricity and heat prices as an example in Greece10, due to more electricity generation in gasification based system, this technology gives twice net present value in comparison with ORC based CHP plant (A.Rentizelas, S. Karellas, E.Kakaras, I.Tatsiopoulos, 2009); however, much more initial investment is needed for gasification based system which means not so lower payback time and not so higher internal rate of return for the technology. Definition of terms “net present value”, “internal rate of return” and “payback time” is mentioned in section A‐2. 10 ORC in combined heat and power system has about 20% less internal rate of return and about 25% more payback time in comparison with gasification based system. Gasification has about two times the net present value since the effect of revenue from electricity generation is more important in this economical factor. The Figure 6 shows the initial cost break down for two technologies. 9 Figure 6: Comparison of ORC and gasification based combined heat and power plant based on initial cost Source: Energy Conversion and Management 20099 The Figure 7 Shows the return of investment for produced heat, cooling and electricity in both technologies. 15PDF Image | Exergy
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