Exergy assessment and sustainability of a simple off-shore oscillating water column device Molina Salas, Ángel Quirós, C. Gigant, P. Huertas-Fernández, Francisco Clavero Gilabert, María Moñino Ferrando, Antonio Wave energy Oscillating Water Column (OWC) Thermodynamics Renewability Exergy Renewability index This work was funded by Andalusian Regional Government, Spain, projects P18-RT-3595 and B-RNM-346-UGR18. Research to be continued under grant TED2021-131717B-I00 funded by MCIN/AEI/ 10.13039/501100011033 and, as appropriate, by ERDF A way of making Europe, by he European Union and by the European Union NextGenerationEU/PRTR. This paper present a research on the performance efficiency and sustainability of an Oscillating Water Column (OWC) simple off-shore device, accounting for the influence of governing thermodynamic variables (moisture, temperature, pressure) in the compression/expansion polytropic process. The work proposes a simple off-shore OWC experimental set up as the basis of the study. The analysis takes into consideration both gas subsystems inside and outside the OWC, to achieve a better understanding of the conservative nature of entropy system variable, the net exchange balance, the effects on efficiency and exergy destruction, and the interpretation of the OWC as a thermodynamic engine. Results show that, within the context of the set up, moderate wave climate conditions contribute to a better efficiency of the device in terms of output power, providing with a low impact on exergy destruction and high sustainability in terms of renewability index. 2023-02-13T08:40:06Z 2023-02-13T08:40:06Z 2022-11-22 journal article A. Molina-Salas et al. Exergy assessment and sustainability of a simple off-shore oscillating water column device. Energy 264 (2023) 126142 [https://doi.org/10.1016/j.energy.2022.126142] https://hdl.handle.net/10481/79856 10.1016/j.energy.2022.126142 eng http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 Internacional Elsevier