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Chapter 4 Thermodynamic analysis 4.1 Introduction After the presentation of all the working hypotheses that underlie the simulations of the investigated power plants performance, in this chapter results of the analysis are shown and discussed. The objective of this phase is to determine the most interesting solutions for biomass power generation from a thermodynamic point of view: in the next chapter, these will then be subject to an economic analysis, in order to determine the globally best solution for each power size. Firstly the investigated solutions are being listed and described, afterwards results, in terms of electrical efficiency (ηel) and first law efficiency (ηI), are shown. The former parameter is the most important because the main interest of this work is power generation; nevertheless the latter is significant as well, since it provides information about the global energy efficiency of the plant. Finally, some possible gasification device variations are being discussed, in order to identify potential base configuration corrections allowing to reach better performance. Wood pellets have been used as fuel in the analyses of this chapter. Their composition has already been shown in Table 3.1, while their lower heating value is 16,784 kJ/kg. Obviously this indication should not be taken literally, i.e. wood pellets are actually not supposed to be used for plants feeding (it would be technically and economically unreasonable): in this phase it was simply necessary to choose a reference fuel having good energy characteristics, and in particular a low moisture level, in order to obtain results not excessively influenced by this parameter1. The effect of using different fuel types, i.e. characterised by different moisture values, will be discussed in Chapter 6. 1 On the other hand, to adopt a totally dry fuel would not have been a likely solution. Chapter 4 Thermodynamic analysis 129PDF Image | SMALL-SCALE BIOMASS POWER GENERATION
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