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Chapter 5 Economic analysis Figure 5.12, instead, shows the behaviour of PayBack Times as a function of the same parameter in the intermediate 2500 h heat sale scenario for all the considered scales. 10 8 6 4 2 GT HYB - PayBack Time vs fuel input share 0 0 10 20 30 40 50 60 70 80 90 100 Percentage of biomass power on total fuel input [% ] 100 kWel 1 MWel 1 MWel - base case 5 MWel (K = 1.3) 5 MWel (K = 1.3) - base case 5 MWel (K = 1.8) 5 MWel (K = 1.8) - base case Figure 5.12 – GT HYB: PBT as a function of fuel input share. As predictable, the 100 kWel curve is the highest one, being penalised by higher specific investment costs and thus providing higher PayBack Times. On the contrary, 1 MWel and long chain-5 MWel give intermediate results. Curves are almost identical, as the former higher incentives balance the latter higher efficiencies, while short chain-5 MWel provides the best performance. Generally one can conclude that natural gas share should not exceed 30% of fuel power input at 100 kWel and 50% at the other scales, since otherwise PBTs grow dramatically. In particular in all cases PBTs are not even defined for low biomass use, the curve growing towards infinity: this is due to the mentioned fact that, with low economic incentives, not only earnings are not sufficient to reach the break-even point, but cash flows are actually negative. The operating points of the base case at 1 MWel and 5 MWel are additionally indicated in the figure: obviously this has not been done as regards 100 kWel, since the base case at this scale does not yield an economic return. 1 MWel case provides very good results thanks to the high share of biomass consumption. As mentioned, this analysis is conducted referring to 2500 h heat sale: it is quite easy to figure that results in the other two cases (0 h or 7000 h) would be shifted numerically but would be absolutely similar in qualitative terms. 192 PBT [years]PDF Image | SMALL-SCALE BIOMASS POWER GENERATION
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