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Energies 2017, 10(5), 619; doi:10.3390/en10050619

Experimental Assessment of a Helical Coil Heat Exchanger Operating at Subcritical and Supercritical Conditions in a Small-Scale Solar Organic Rankine Cycle

1
Department of Flow, Heat and Combustion Mechanics, Ghent University, Sint-Pietersnieuwstraat 41, Ghent 9000, Belgium
2
Flanders Make, the Strategic Research Centre for the Manufacturing Industry, Lommel 3920, Belgium
3
Department of Natural Resources and Agricultural Engineering, Agricultural University of Athens, Iera Odos Street 75, Athens 11855, Greece
*
Author to whom correspondence should be addressed.
Academic Editors: Andrew J. Haslam and Christos N. Markides
Received: 8 March 2017 / Revised: 14 April 2017 / Accepted: 19 April 2017 / Published: 4 May 2017
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Abstract

In this study, the performance of a helical coil heat exchanger operating at subcritical and supercritical conditions is analysed. The counter-current heat exchanger was specially designed to operate at a maximal pressure and temperature of 42 bar and 200 °C, respectively. The small-scale solar organic Rankine cycle (ORC) installation has a net power output of 3 kWe. The first tests were done in a laboratory where an electrical heater was used instead of the concentrated photovoltaic/thermal (CPV/T) collectors. The inlet heating fluid temperature of the water was 95 °C. The effects of different parameters on the heat transfer rate in the heat exchanger were investigated. Particularly, the performance analysis was elaborated considering the changes of the mass flow rate of the working fluid (R-404A) in the range of 0.20–0.33 kg/s and the inlet pressure varying from 18 bar up to 41 bar. Hence, the variation of the heat flux was in the range of 5–9 kW/m2. The results show that the working fluid’s mass flow rate has significant influence on the heat transfer rate rather than the operational pressure. Furthermore, from the comparison between the experimental results with the heat transfer correlations from the literature, the experimental results fall within the uncertainty range for the supercritical analysis but there is a deviation of the investigated subcritical correlations. View Full-Text
Keywords: experimental research; helical coil heat exchanger; organic Rankine cycle; subcritical; supercritical; heat transfer experimental research; helical coil heat exchanger; organic Rankine cycle; subcritical; supercritical; heat transfer
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Lazova, M.; Kaya, A.; Billiet, M.; Lecompte, S.; Manolakos, D.; De Paepe, M. Experimental Assessment of a Helical Coil Heat Exchanger Operating at Subcritical and Supercritical Conditions in a Small-Scale Solar Organic Rankine Cycle. Energies 2017, 10, 619.

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