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combined cycle was rejected since only two demonstration plant could be identified namely the ARBRE and Värnamo plant and in addition both these plants suffers from financial problems. Still the technologies that are evaluated in this report are ORC, EFGT, gas engines and steam engines (circumscribed in Figure 1.3). The information needed for the techno- economic evaluation of these technologies was collected from already published work but also via personal communications with responsible persons for some of the reference plants considered. Figure 1.3 Biomass based CHP technologies for different plant sizes Economic Evaluation Considering the economic evaluation it should to be mentioned that when generating heat and electricity simultaneous in a CHP plant it will produce sale revenues from both heat and electricity. Consequently both should be accounted for in the economic calculations. However since this study only consider small-scale CHP plants, which in general are heat controlled, the electricity producing part can be seen as an additional investment to the heat plant and should therefore be economic motivated by it self. One way to approach this is to distinguish the costs for the electricity generation part from the heat generating part and from there calculate a cost of electricity (COE) respective cost of heat (COH). Yet since it is difficult to obtain detailed investment and cost information for every plant studied, a simplification was made to distinguish the electricity part from the heat part. Given that the total investment of the CHP plant is known, one wants to decide the investment amount that corresponds to the electricity generating part. This was done with the method of subtracting an assumed investment for a hypothetical heat generating plant of the same thermal power as the considered CHP plant from the total investment of the plant. The required specific investment (Equation 1.1) for different heat only plant in the range 0.5-10 MWth was taken from Kjellström, [7]. 6PDF Image | Biomass Based Small Scale Combined Heat and Power Tech
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