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Paschalia Mavrou1,2, Athanasios I. Papadopoulos1, Mirko Z. Stijepovic3, Panos Seferlis1,2,Patrick Linke3, Spyros Voutetakis1. Applied Thermal Engineering, Volume 75, 2015, Pages 384-396.
[expand title=”Show Affiliations”]- Chemical Process and Energy Resources Institute, Centre for Research and Technology-Hellas, Thermi, 57001 Thessaloniki, Greece
- Department of Mechanical Engineering, Aristotle University of Thessaloniki, P.O. Box 484, 54124 Thessaloniki, Greece
- Department of Chemical Engineering, Texas A&M University at Qatar, PO Box 23874, Education City, Doha, Qatar. [/expand]
Abstract
This work investigates the performance of working fluid mixtures for use in solar ORC (Organic Rankine Cycle systems) with heat storage employing FPC (Flat Plate Collectors). Several mixtures are considered including conventional choices often utilized in ORC as well as novel mixtures previously designed using advanced computer aided molecular design methods (Papadopoulos et al., 2013). The impact of heat source variability on the ORC performance is assessed for different working fluid mixtures. Solar radiation is represented in detail through actual, hourly averaged data for an entire year. A multi-criteria mixture selection methodology unveils important trade-offs among several important system operating parameters and efficiently highlights optimum operating ranges. Such parameters include the ORC thermal efficiency, the net generated power, the volume ratio across the turbine, the mass flow rate of the ORC working fluid, the evaporator temperature glide, the temperature drop in the storage tank, the ORC total yearly operating duration, the required collector aperture area to generate 1 kW of power and the irreversibility. A mixture of neopentane – 2-fluoromethoxy-2-methylpropane at 70% neopentane is found to be the most efficient in all the considered criteria simultaneously.
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