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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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chamber. The sustainability index increases correspondingly for all three cycles considered (GT, CHP and multigeneration). Figure 6.27: Variations with compressor pressure ratio of sustainability index and cost rate of environmental impact. Fig. 6.28 shows the effect of compressor pressure ratio on total exergy destruction of the cycle and sustainability index, and similar results are obtained as in Fig. 6.27. That is, the overall exergy destruction of the cycle decreases and the sustainability index increases with increasing compressor pressure ratio. Exergy efficiency, exergy destruction, environmental impact and sustainability are thus observed to be linked in such systems, supporting the utility of exergy and environmental impact assessment. Fig. 6.29 shows the effect of compressor pressure ratio on total cost rate and cost of environmental impact. An increase in compressor pressure ratio leads to a decrease in both costs. The reason for the compressor pressure ratio effect is that an increase in this parameter increases the outlet temperature and decreases the mass flow rate injected to the combustion chamber. As the first term in the total cost rate is directly associated with the mass flow rate of the fuel cost, any decrease in this term results in a decrease in the total cost of the system. A significant design parameter is the gas turbine inlet temperature (GTIT). Raising this parameter can increase gas turbine output power. But an energy balance of the combustion chamber indicates that the fuel input rate also decreases as the GTIT rises. 136

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