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Session: Session 4B: System design (1)
Session starts: Tuesday 10 September, 14:00
Presentation starts: 15:00
Room: Attica

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Tryfon Roumpedakis (National Technical University of Athens)
George Loumpardis (National Technical University of Athens)
Sotirios Karellas (National Technical University of Athens)

Abstract:
The continuous increase in the energy demand, the reduction on the fossil fuels reservoirs as well as their malevolent impact on the environment has turned interest towards more “green” alternatives for decentralized power production. In this study, the performance of a small scale low temperature solar driven ORC is investigated for application in South-East Mediterranean region. The study includes the assessment of multiple scenarios, in terms of the working fluid, the site of installation and the solar collector’s type. For each scenario a multi-objective genetic algorithm has been developed and executed in order to optimize the payback period and the mean exergy efficiency for each solar driven ORC for an annual operation using an hourly step. The results indicate that the optimum was located for all scenarios in the minimum heat storage tank capacity. On the other hand, the correlation between the solar field area and the optimization parameters is more complicated and directly connected to the climatic conditions of each considered location. The maximum exergy efficiency among the considered scenarios is in the range of 6.2% for a flat plate collectors’ driven ORC using R245fa as working fluid. The minimum payback period was reported for the case of Larnaca, using parabolic trough collectors and R152a as the ORC’s fluid. Finally, for a more broad comparison of the system’s results, the annual energy production of the ORC was translated in primary energy savings. For this analysis, it was observed that in all cities R152a was achieving the highest savings for the maximum area of the solar field.