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Table 8.5 Economic calculations for the 1100 kW plant Value [kW] 1100 [kW] 5575 [kW] 7586 Equation Pel Pth Pfuel α Total efficiency (ηtot) Marginal efficiency (ηmarg) Electric efficiency (ηel) Thermal efficiency (ηth) Additional Investment (Iadd) Specific additional Investment (Is,add) Interest rate (r) Economic utilization period (te) Technical utilization period (tt) annuity factor (a) Capital cost Fuel cost (Cfuel) Electricity Additional costs Gen consumption Consumption Hourly rate Annual working hour Management and personal cost Maintenance Operation cost Other cost Total COE [€] [ €/kWel] [year] [year] 0.20 0.88 0.79 0.15 0.73 2974000 2704 0.06 20 20 0.0871 259322 [€/a] [€/a] [€/a] [€/a] [€/a] 5949 0,002*Iadd [€/a] 168678 [€/h] 30 [h] 800 [€/a] 29918 a*Iadd 93760 (Pel/ntot)*h*Cb/1000 43120 Ke*Pel*0,08 25850 4,7*Pel*h/1000 [€/a] [€/a] [€/a] [€/a] [€/MWhel] 53837 1,81*Iadd 83755 29744 0.01*Iadd 541499 98 (Ccap+Ccon+Cope+Coth)/(kWhel/a) The calculations are presented in the equation column of Table 8.5. However the electricity consumption costs for the 600 and 1500 kW plants where calculated with the factor Ke, which was evaluated from Table 8.7 using Equation B.3 Ke = CHP _ surplus = 538810 ≈ 490 [kWhel(consumption)/kW(produced)] (B.3) Pel 1100 The equations in Table 8.5 was used to evaluate Equations B.4 this was then used with the investments for the 600 and 1500 plant shown in Table 8.4 to calculate the COE for each plant. COE=α×I + tot add (B.4) P ×h×10 el P ×h×Cfuel +Ke×P ×0.08+4.7*P ×h+(0.002+0.0181+0.01)×I +29918 η 1000 el 1000 add −3 el el 73PDF Image | Biomass Based Small Scale Combined Heat and Power Tech
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