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Biomass Based Small Scale Combined Heat and Power Tech

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Biomass Based Small Scale Combined Heat and Power Tech ( biomass-based-small-scale-combined-heat-and-power-tech )

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Table 5.7 Costs, income and return for the Harads plant Electricity Heat part part Costs COE/a Income Electric sales Electric certificates Return Respective Total (Heat + Electricity) 274247 62500 €/a 457947 €/a 607500 €/a 149553 €/a €/a COH/a 58750 -132247 17307 €/a €/a Heat sales €/a A sensitivity analysis was made to investigate which factors that have the largest influence on the COE respective COH. As a reference case the assumptions in Table 5.8 were used. Different input variables were then varied one at a time as the COE and COH was calculated for each case. Table 5.8 Sensitivity analysis Fuel price COE COH Annual operation hours COE COH Investment COE COH Discount rate COE COH Economic lifetime COE COH [€/MWhfuel] [€/MWhel] [€/MWhth] [Hours] [€/MWhel] [€/MWhth] [%] [€/MWhel] [€/MWhth] [%] [€/MWhel] [€/MWhth] [Years] [€/MWhel] [€/MWhth] Min 8.7 Ref Max 15 23.4 122 133 114 37 45 56 7500 5000 2500 89 122 220 37 45 71 -25 0 25 99 122 145 39 45 51 46 10 114 122 140 43 45 50 20 15 10 112 122 143 43 45 51 Results of the sensitivity analysis are shown in Figure 5.1, as seen the annual operation hours have a large impact on the COE. One surprising thing is that the fuel price does not influence the final COE by much. This might be explained by the low electricity efficiency of the ORC. 58

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