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Chapter 7: Conclusions and Recommendations This PhD thesis provides several useful conclusions and recommendation for future research as follows: 7.1 Conclusions The following concluding remarks are drawn from this study regarding the studied multigeneration systems: System I: Gas turbine-based multigeneration The exergy results show that the combustion chamber, steam condenser and HRSG are the main sources of irreversibility, with the high exergy destruction attributable to the high temperature difference for heat transfer in both devices and the reaction in the combustion chamber. In addition, and CHP the multigeneration cycle exhibits less CO2 and CO emissions than micro gas turbine cycles. Additional conclusions are as follows: The exergy efficiency of the multigeneration cycle increases with gas turbine isentropic efficiency. The overall exergy destruction of the cycle decreases and the sustainability index increases with increasing compressor pressure ratio. The exergy efficiency and sustainability index for the multigeneration, gas turbine and CHP cycles increases with turbine inlet temperature, and the exergy efficiency of the system is slightly lower than the energy efficiency. The cost of environmental impact for the multigeneration system is significantly less than the cost associated with the power and CHP cycles. Multigeneration energy systems are good options to mitigate global warming as they can reduce CO2 and CO emissions and also help reduce the cost of environmental impacts by producing several useful outputs from one energy input. The optimization results suggest that the compressor isentropic efficiency, gas turbine inlet temperature, compressor pressure ratio and ORC extraction pressure tend to have maximum values within their specified ranges, and that an increase in these parameters results in better system performance. Other concluding remarks follow: 217PDF Image | Energy Systems for Multigeneration Purposes
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