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electricity- and heat generating part. Worth to notice is that the electricity respective heat generating part of the plant has different economic lifetime a summary is listed in Table 2.7. Table 2.7 Investment and annual cost CHP plant in Lienz,[19] Investment Investment electricity related Investment heat related Annual costs electricity related Economic lifetime Capital recovery factor (Interest rate = 0.06) Capital cost Consumption costs (fuel, electricity consumption) Operation costs (Personnel, maintanace) Other costs Sum Annual costs heat related Economic lifetime Capital costs Consumption costs Operation costs Other costs Sum [€] [€] Years [€/a] [€/a] [€/a] [€/a] [€/a] 2 974 000 5 985 851 20 0.087 259287 168653 83998 29740 541678 Years 15-25 [€/ a] [€/ a] [€/ a] [€/ a] [k€/a] 1947 575161 1079769 250142 41901 If the plant is in full operation 5000 hours per year, it will produce 5500 MWhel of electricity and 24845 MWhth of useful heat with a generation cost of 98 €/MWhel and 31 €/MWth respectively. The complete economic calculations are presented in Appendix C. 2.1.3. Summary Organic Rankine Cycle The ORC is suitable for decentralized small scale CHP applications thanks to the excellent partial load efficiency, which is beneficial when operated in a heat controlled mode. The fact that the technology is also robust and well developed besides requires very few personnel, makes it even more suitable for this kind of application. Yet the ORC-working fluid is often highly flammable which puts higher demand on fire safety measures. The thermo-oil boiler also needs higher safety precautions regarding leakages than an ordinary steam boiler. The cost of electricity for the technology is relatively high and amounts to about 100 €/MWhel for a 1 MWel plant. This means that subsidies are needed, either in the form of electricity certificates or investment grants to make the technology competitive in Sweden. 21PDF Image | Biomass Based Small Scale Combined Heat and Power Tech
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