Energy Systems for Multigeneration Purposes

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

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difference, approach temperature difference and condenser temperature difference are selected as the decision variables. Shirazi et al. [70] conducted a comprehensive thermodynamic modeling and multi- objective optimization of an internal reforming solid oxide fuel cell gas turbine hybrid system. They validated the model using available data in the literature. They used genetic algorithm to optimize the system. In the multi-objective optimization procedure, the exergy efficiency and the total cost rate of the system (including the capital and maintenance costs, operational cost and social cost of air pollution for CO, NOx, and CO2) were considered as objective functions. They also performed sensitivity analyses of the variation of each objective function with major design parameters of the system. 3.3 Multigeneration energy systems A multigeneration energy system refers to a system with more than three different useful outputs with a same source of input energy (e, g prime mover). These outputs could be electricity, cooling, heating, hot water, hydrogen and fresh water. It is of great importance that these systems could be considered for residential application, power plants and other places where numerous useful outputs are required. It must be noticed that location and the requirements of application is a major factors in designing a multigeneration energy system. Hosseini et al. [71] conducted a comprehensive thermodynamic model for an integrated energy system. The system studied consists of a gas turbine, a SOFC fuel cell, a single pressure HRSG and a multi effect desalination to produce electricity, heating, cooling and fresh water. They also performed a comprehensive parametric study to see the effect of some major design parameters on the system performance. The results showed that the integrated system could increase the system efficiency by about 25% compared to a single generation system. Ahmadi et al. [6] studied a new integrated trigeneration energy system consisting of a gas turbine, a double pressure heat recovery steam generator and a single effect absorption chiller and an organic Rankine cycle. They also performed a parametric study to see the variation of exergy efficiency, cooling and heating load and cost of environmental impact. The results of this study demonstrated that system performance is notably affected by the compressor pressure ratio, the gas turbine inlet temperature and the gas turbine isentropic efficiency. 46

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