Optimal Design of Overtopping Breakwater for Energy Conversion (OBREC) Systems Using the Harmony Search Algorithm

Abstract

The European Union, in its Framework Strategy for A Resilient Energy Union, as described in the "Clean Energy for all Europeans" package of measures, marked its energy priorities for transition to a low-carbon, secure and competitive economy. Following this direction, the paper deals with the exploitation of one of the most significant and extensively available energy sources, that of nearshore waves. More specifically the paper emphasizes in the optimal design of Overtopping Breakwater for Energy Conversion systems, known as OBREC, using a novel and very effective, meta-heuristic optimization technique, the Harmony Search Algorithm. The proposed methodology is based on the combined application of wave propagation equations that simulate the compound wave field near coastal structures where the waves are subjected to the combined effects of shoaling, refraction, diffraction, reflection-total and partial-and breaking, with an optimization algorithm, aiming at the identification of the optimal dimensions of an OBREC reservoir. In order to demonstrate the effectiveness of the methodology, the port of Heraklion in the island of Crete in Greece, is used as a case study. The results of the application are very promising and strongly support the statement that the proposed methodology provides a new concept in the design of OBREC systems.

Experimental Comparison of Linear and Cubic Ramps for Hybrid Overtopping Breakwater Energy Conversion

“…The overall average performance of OBREC was about 6.62 kW for cubic shape and 4.81 kW for linear shape. On the other hand, the result presented in this section is quite similar to the finding calculated by (Kralli et al, 2019;Palma et al, 2020) who estimated OBREC power contribution in deference places and situations. The percentage of wave energy captured by the device could be defined as hydraulic efficiency, shown in Table 4.…”

Numerical Analysis of an Overtopping Wave Energy Converter Subjected to the Incidence of Irregular and Regular Waves from Realistic Sea States

“…However, there is no adequate data to estimate the extra energy that can be generated by the swells. Experimental tests performed by Kralli et al [24] indicated that an OBREC can achieve a performance that is improved by 20% due to the incidence of swell waves.…”

Adaptive binary multi-objective harmony search algorithm for channel selection and cross-subject generalization in motor imagery-based BCI

“…Then the iteration continues until the predetermined maximum number of iterations (NIs) is reached. Moreover, harmony search algorithms and their variants have been developed and successfully applied to address practical problems [34][35][36]. Channel selection based on the binary harmony search method was proposed to optimize the channels and enhance the BCI system accuracy [29].…”