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Energy Systems for Multigeneration Purposes

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Energy Systems for Multigeneration Purposes ( energy-systems-multigeneration-purposes )

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system is considered. The thermodynamic formulas were already explained and given in section 5.6.1.5 as shown in Fig. 4.3. 5.7.2 Exergy analysis of system II 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. 4.3) are shown in Table 5.7.  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. The energy efficiency of the OTEC power generation system is defined as the net power output of the system divided by input energy at evaporator, which can be expressed as where ̇ ̇ ̇ ̇ is given in equation (5.222), and ̇( ) ̇̇ ̇ ̇ is expressible as (5.245) (5.246) (5.247) (5.248) ̇̇̇̇̇ ̇  5.7.2.3 Exergy efficiency The exergy efficiency is defined as the product exergy output divided by the exergy input. According to Yamada et al. [88], the exergy efficiency of the ORC power generation cycle in an OTEC system is given as ̇̇ ̇̇̇ (5.249) 110

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