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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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6.2. 2 Exergy and economic analyses results The exergy analysis results are summarized in Fig. 6.3, and show that the highest exergy destruction occurs in the combustion chamber (CC), mainly due to the irreversibilities associated with combustion and the large temperature difference between the air entering the CC and the flame temperature. The condenser in the Rankine cycle exhibits the next largest exergy destruction, mainly due to the temperature difference between two fluid streams passing through it, but also due to the pressure drop across the device. 20000 15000 10000 5000 0 507.6 844.2 1776.6 496.8 171 57.6 216 156.6 57.6 10211.4 Exergy destruction rate (kW) 3992.4 18487.8 Figure 6.3: Exergy destruction rates for the multigeneration system and its components. Fig. 6.4 shows for each component the dimensionless exergy destruction ratio. This measure is useful for prioritizing exergy losses in an intuitive manner. Both exergy destruction and the dimensionless exergy destruction ratio are higher in the combustor than in other components, suggesting that it would likely be worthwhile to focus improvement efforts on this component. Moreover, the results show that the absorption cycle does not exhibit significant exergy destructions, in part because it does not directly utilize fuel energy but instead uses steam produced by the HRSG. 119

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