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that the maximum output work of the MCFC is estimated to be 314.3 kW for an operating temperature of 650 0C. The overall energy and exergy efficiencies achieved for this system were 42.89% and 37.75%, respectively. Akkaya et al. [26] conducted the exergy analysis for a hybrid CHP system using a SOFC and a gas turbine. They also performed a complete parametric study of the system. The results showed that a design based on an exergy performance coefficient criterion has considerable advantage in terms of entropy generation rate. Al-Sulaiman et al. [27] demonstrated an efficiency gain of more than 22% using a trigeneration plant compared with a power cycle (SOFC and organic Rankine cycle). They also determined the maximum efficiencies of 74% for the trigeneration plant, 71% for heating cogeneration, 57% for cooling cogeneration and 46% for net electricity generation, and concluded that exergy analysis is a significant tool for both CHP and trigeneration cycles. In recent decades, exergoeconomics and thermoeconomics have been increasingly utilized by researchers, combining thermodynamics with economics. Many such studies have been reported, especially for power generation and cogeneration (CHP). Rosen and Dincer [28] performed an exergoeconomic analysis of a coal fired electricity generating station, and found the ratio of thermodynamic loss rate to the capital cost to be a significant parameter in evaluating plant performance that may allow thermodynamics and economics to be successfully traded-off in plant designs. Ahmadi et al. [29] carried out energy, exergy and exergoeconomic analyses of a steam power plant in Iran, and considered the effect of the load variations and ambient temperature on component exergy destruction rate. The results showed that energy losses are mainly associated with the condenser, where the energy loss rate to the environment was 307 MW, while the boiler energy loss rate was only 68 MW. However, the irreversibility rate of the boiler was significantly higher than the irreversibility rates of the other components. Exergy and exergoeconomic analyses of CHP plants [30-32] have demonstrated the usefulness of these methods for thermal systems. 3.2 Trigeneration systems Trigeneration is the simultaneous production of heating, cooling and electricity from a common energy source. Trigeneration utilizes waste or other heat from a power plant to improve overall thermal performance, often utilizing the free energy available via waste energy. In a trigeneration 38PDF Image | Energy Systems for Multigeneration Purposes
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