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5.6.2 Exergy analysis of system II Exergy balance equations of a biomass based multigeneration system Here, the exergy of each flow is calculated at all states and the changes in exergy are determined for each major component. The exergy destructions for all components in this multigeneration system (Fig. 4.2) are listed in Table 5.6. Energy efficiency The energy, or first law, efficiency is defined as the ratio of useful energy produced by the system (cold, heat, electricity) to the input energy of the fuel supplied to the system. In this study, we consider three energy efficiencies for the system: the biomass ORC cycle, the CHP portion of the system and the overall multigeneration system, i.e., ̇ ̇ ̇̇ ̇ ̇̇̇̇̇̇ ̇ (5.199) (5.200) (5.201) where LHVf denotes the lower heating value of the biomass. For pure and dry biomass fuels, nitrogen and sulphur are usually negligible and the below formula is used for a biomass with a chemical formula of CHaOb: ̅̅̅̅̅̅ () (5.202) The lower heating value for biomass with moisture is expressible as [106]: ̅̅̅̅̅̅ where Also, generation cycle. ̅̅̅̅̅̅ (5.203) respectively denote mineral matter content and moisture content in biomass. and ̇ denote the heating load of the multigeneration system, the double- effect absorption cooling load, while the last three terms in the numerator denote the energy values of the hydrogen, hot water and fresh water products. It can be seen from these expressions the energy efficiency of the multigeneration system must exceed that for power ̇ and 101PDF Image | Energy Systems for Multigeneration Purposes
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