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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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As it was already discussed, an increase in pump inlet temperature decrease the turbine work and since the purchase cost of turbine is proportional to the work the cost of turbine decreases which finally leads to a decrease in total cost rate of the system. 6.3. 3 Environmental impact assessment To provide environmental insights, the environmental impact of the power system is compared to that of the multigeneration in Fig. 6.63. It is seen that the multigeneration cycle has less CO2 emissions than the power and CHP cycles, providing a significant motivation for the use of multi- generation cycles. It is also observed that multi-generation considered here has a higher exergy efficiency than other cycles. 35 30 25 20 15 10 5 0 Single generation Cogeneration Trigeneration Multigeneration Exergy efficiency (%) 9 12.2 15 29 CO2 emission (t/MWh) 4.035 0.659 0.51 0.358 Figure 6.63: Comparison of exergy efficiencies and environmental impacts for three types of plants. The variation of CO2 emissions with ORC turbine inlet pressure is shown in Fig. 6.64. Increasing this pressure decreases the CO2 emissions for all cycles, however the decrease in CO2 emissions for the power cycle is greater compared to that for the multigeneration system. This observation is attributable to the fact that an increase in turbine inlet pressure always results in an 172

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