Experimental Performance Analysis of a Hybrid Wave Energy Harvesting System Combining E-Motions with Triboelectric Nanogenerators

• Type: Article in International Scientific Journal
• Date: 2022-12-15

Authors

Daniel Clemente (Author) FEUP; Cátia Rodrigues (Author) Other; Ricardo Esteves (Author) Other; José Correia (Author) Other; pereira, a. m. (Author) FCUP; ventura, j. (Author) FCUP; Paulo Rosa Santos (Author) FEUP; Francisco Taveira Pinto (Author) FEUP; Paulo Martins (Author) Other

Journal

Title: Journal of Marine Science and Engineering

Vol. 13

Pages: 1-1924

Publisher: MDPI

Indexing

ISI Web of Knowledge - 1 Citation

ISI Web of Science

Scopus - 1 Citation

Scientific classification

CORDIS: Technological sciences

FOS: Engineering and technology

Other information

Authenticus ID: P-00X-J7Q

DOI: 10.3390/jmse10121924

Abstract (EN): This paper discusses a disruptive approach to wave energy conversion, based on a hybrid solution: the E-Motions wave energy converter with integrated triboelectric nanogenerators. To demonstrate it, a physical modelling study was carried out with nine E-Motions sub-variants, which were based on three original hull designs (half-cylinder (HC), half-sphere (HS) and trapezoidal prism (TP)). A unidirectional lateral tribo-device was incorporated within the E-Motions' hull during the experiments. The physical models were subjected to eight irregular sea-states from a reference study on the Portuguese coastline. Results point towards a significant hydrodynamic roll response, with peaks of up to 40 degrees/m. Three peaks were observed for the surge motions, associated with slow drifting at low frequencies. The response bandwidth of the HC sub-variants was affected by the varying PTO mass-damping values. By comparison, such response was generally maintained for all HS sub-variants and improved for the TP sub-variants, due to ballast positioning adjustments. Maximum power ratios ranged between 0.015 kW/m(3) and 0.030 kW/m(3). The TENGs demonstrated an average open-circuit voltage and power per kilogram ratio of up to 85 V and 18 mW/kg, respectively, whilst exhibiting an evolution highly dependent upon wave excitation, surge excursions and roll oscillations. Thus, TENGs enable redundant dual-mode wave energy conversion alongside E-Motions, which can power supporting equipment with negligible influence on platform hydrodynamics.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 26